Expansion#

Pinout Diagrams#

BeagleBone AI-64 P8 & P9 cape headers are designed to be compatible with BeagleBone Black as much as possible. Below pinout diagrams are design to simplify cape header pin usage and cape design process for AI-64. To start using P8 / P9 cape header choose respective pinout diagram tab below.

Fig. 122 BeagleBone AI-64 P8 cape header pinout#

Cape Header Connectors#

Beagle cape expansion interface on the BeagleBone AI-64 like other Beagles is comprised of two headers P8 (46 pin) & P9 (50 pin). All signals on the expansion headers are 3.3V unless otherwise indicated. On some of the cape header pins on AI-64 multiple SoC pins are shorted and only one of them should be used at a time. Information regarding the double/shorted pins is provided in the Pinout Diagrams above (simplified) and cape header pin tables below (detailed).

Danger

Do not connect 5V logic level signals to these pins or the board will be damaged.

NO PINS ARE TO BE DRIVEN UNTIL AFTER THE SYS_RESET LINE GOES HIGH. DO NOT APPLY VOLTAGE TO ANY I/O PIN WHEN POWER IS NOT SUPPLIED TO THE BOARD. IT WILL DAMAGE THE PROCESSOR AND VOID THE WARRANTY.

Connector P8#

The following tables show the pinout of the P8 expansion header. The SW is responsible for setting the default function of each pin. Refer to the processor documentation for more information on these pins and detailed descriptions of all of the pins listed. In some cases there may not be enough signals to complete a group of signals that may be required to implement a total interface.

The column heading is the pin number on the expansion header.

The GPIO row is the expected gpio identifier number in the Linux kernel.

Each row includes the gpiochipX and pinY in the format of X Y. You can use these values to directly control the GPIO pins with the commands shown below.

# to set the GPIO pin state to HIGH
debian@BeagleBone:~$ gpioset X Y=1

# to set the GPIO pin state to LOW
debian@BeagleBone:~$ gpioset X Y=0

For Example:

+---------+----------+
| Pin     | P8.03    |
+=========+==========+
| GPIO    | 1 20     |
+---------+----------+

Use the commands below for controlling this pin (P8.03) where X = 1 and Y = 20

# to set the GPIO pin state to HIGH
debian@BeagleBone:~$ gpioset 1 20=1

# to set the GPIO pin state to LOW
debian@BeagleBone:~$ gpioset 1 20=0

The BALL row is the pin number on the processor.

The REG row is the offset of the control register for the processor pin.

The MODE # rows are the mode setting for each pin. Setting each mode to align with the mode column will give that function on that pin.

Important

DO NOT APPLY VOLTAGE TO ANY I/O PIN WHEN POWER IS NOT SUPPLIED TO THE BOARD. IT WILL DAMAGE THE PROCESSOR AND VOID THE WARRANTY.

NO PINS ARE TO BE DRIVEN UNTIL AFTER THE SYS_RESET LINE GOES HIGH.

P8.01-P8.02#

P8.01	P8.02
GND	GND

P8.03-P8.05#

Pin	P8.03	P8.04	P8.05
GPIO	1 20	1 48	1 33
BALL	AH21	AC29	AH25
REG	0x00011C054	0x00011C0C4	0x00011C088
Page	46	30	50
MODE 0	PRG1_PRU0_GPO19	PRG0_PRU0_GPO5	PRG1_PRU1_GPO12
1	PRG1_PRU0_GPI19	PRG0_PRU0_GPI5	PRG1_PRU1_GPI12
2	PRG1_IEP0_EDC_SYNC_OUT0	~	PRG1_RGMII2_TD1
3	PRG1_PWM0_TZ_OUT	PRG0_PWM3_B2	PRG1_PWM1_A0
4	~	~	RGMII2_TD1
5	RMII5_TXD0	RMII3_TXD0	~
6	MCAN6_TX	~	MCAN7_TX
7	GPIO0_20	GPIO0_48	GPIO0_33
8	~	GPMC0_AD0	RGMII8_TD1
9	~	~	~
10	VOUT0_EXTPCLKIN	~	VOUT0_DATA12
11	VPFE0_PCLK	~	~
12	MCASP4_AFSX	MCASP0_AXR3	MCASP9_AFSX
13	~	~	~
14	~	~	~
Bootstrap	~	BOOTMODE2	~

P8.06-P8.09#

Pin	P8.06	P8.07	P8.08	P8.09
GPIO	1 34	1 15	1 14	1 17
BALL	AG25	AD24	AG24	AE24
REG	0x00011C08C	0x00011C03C	0x00011C038	0x00011C044
Page	51	44	44	45
MODE 0	PRG1_PRU1_GPO13	PRG1_PRU0_GPO14	PRG1_PRU0_GPO13	PRG1_PRU0_GPO16
1	PRG1_PRU1_GPI13	PRG1_PRU0_GPI14	PRG1_PRU0_GPI13	PRG1_PRU0_GPI16
2	PRG1_RGMII2_TD2	PRG1_RGMII1_TD3	PRG1_RGMII1_TD2	PRG1_RGMII1_TXC
3	PRG1_PWM1_B0	PRG1_PWM0_A1	PRG1_PWM0_B0	PRG1_PWM0_A2
4	RGMII2_TD2	RGMII1_TD3	RGMII1_TD2	RGMII1_TXC
5	~	~	~	~
6	MCAN7_RX	MCAN5_RX	MCAN5_TX	MCAN6_RX
7	GPIO0_34	GPIO0_15	GPIO0_14	GPIO0_17
8	RGMII8_TD2	~	~	~
9	~	RGMII7_TD3	RGMII7_TD2	RGMII7_TXC
10	VOUT0_DATA13	VOUT0_DATA19	VOUT0_DATA18	VOUT0_DATA21
11	VPFE0_DATA8	VPFE0_DATA3	VPFE0_DATA2	VPFE0_DATA5
12	MCASP9_AXR0	MCASP7_AXR1	MCASP7_AXR0	MCASP7_AXR3
13	MCASP4_ACLKR	~	~	MCASP7_AFSR
14	~	~	~	~
Bootstrap	~	~	~	~

P8.10-P8.13#

Pin	P8.10	P8.11	P8.12	P8.13
GPIO	1 16	1 60	1 59	1 89
BALL	AC24	AB24	AH28	V27
REG	0x00011C040	0x00011C0F4	0x00011C0F0	0x00011C168
Page	44	33	33	56
MODE 0	PRG1_PRU0_GPO15	PRG0_PRU0_GPO17	PRG0_PRU0_GPO16	RGMII5_TD1
1	PRG1_PRU0_GPI15	PRG0_PRU0_GPI17	PRG0_PRU0_GPI16	RMII7_TXD1
2	PRG1_RGMII1_TX_CTL	PRG0_IEP0_EDC_SYNC_OUT1	PRG0_RGMII1_TXC	I2C3_SCL
3	PRG1_PWM0_B1	PRG0_PWM0_B2	PRG0_PWM0_A2	~
4	RGMII1_TX_CTL	PRG0_ECAP0_SYNC_OUT	RGMII3_TXC	VOUT1_DATA4
5	~	~	~	TRC_DATA2
6	MCAN6_TX	~	~	EHRPWM0_B
7	GPIO0_16	GPIO0_60	GPIO0_59	GPIO0_89
8	~	GPMC0_AD5	~	GPMC0_A5
9	RGMII7_TX_CTL	OBSCLK1	~	~
10	VOUT0_DATA20	~	DSS_FSYNC1	~
11	VPFE0_DATA4	~	~	~
12	MCASP7_AXR2	MCASP0_AXR13	MCASP0_AXR12	MCASP11_ACLKX
13	MCASP7_ACLKR	~	~	~
14	~	~	~	~
Bootstrap	~	BOOTMODE7	~	~

P8.14-P8.16#

Pin	P8.14	P8.15	P8.16
GPIO	1 75	1 61	1 62
BALL	AF27	AB29	AB28
REG	0x00011C130	0x00011C0F8	0x00011C0FC
Page	37	33	34
MODE 0	PRG0_PRU1_GPO12	PRG0_PRU0_GPO18	PRG0_PRU0_GPO19
1	PRG0_PRU1_GPI12	PRG0_PRU0_GPI18	PRG0_PRU0_GPI19
2	PRG0_RGMII2_TD1	PRG0_IEP0_EDC_LATCH_IN0	PRG0_IEP0_EDC_SYNC_OUT0
3	PRG0_PWM1_A0	PRG0_PWM0_TZ_IN	PRG0_PWM0_TZ_OUT
4	RGMII4_TD1	PRG0_ECAP0_IN_APWM_OUT	~
5	~	~	~
6	~	~	~
7	GPIO0_75	GPIO0_61	GPIO0_62
8	~	GPMC0_AD6	GPMC0_AD7
9	~	~	~
10	~	~	~
11	~	~	~
12	MCASP1_AXR8	MCASP0_AXR14	MCASP0_AXR15
13	~	~	~
14	UART8_CTSn	~	~
Bootstrap	~	~	~

P8.17-P8.19#

Pin	P8.17	P8.18	P8.19
GPIO	1 3	1 4	1 88
BALL	AF22	AJ23	V29
REG	0x00011C00C	0x00011C010	0x00011C164
Page	40	40	57
MODE 0	PRG1_PRU0_GPO2	PRG1_PRU0_GPO3	RGMII5_TD2
1	PRG1_PRU0_GPI2	PRG1_PRU0_GPI3	UART3_TXD
2	PRG1_RGMII1_RD2	PRG1_RGMII1_RD3	~
3	PRG1_PWM2_A0	PRG1_PWM3_A2	SYNC3_OUT
4	RGMII1_RD2	RGMII1_RD3	VOUT1_DATA3
5	RMII1_CRS_DV	RMII1_RX_ER	TRC_DATA1
6	~	~	EHRPWM0_A
7	GPIO0_3	GPIO0_4	GPIO0_88
8	GPMC0_WAIT1	GPMC0_DIR	GPMC0_A4
9	RGMII7_RD2	RGMII7_RD3	~
10	~	~	~
11	~	~	~
12	MCASP6_AXR0	MCASP6_AXR1	MCASP10_AXR1
13	~	~	~
14	UART1_RXD	UART1_TXD	~
Bootstrap	~	~	~

P8.20-P8.22#

Pin	P8.20	P8.21	P8.22
GPIO	1 76	1 30	1 5
BALL	AF26	AF21	AH23
REG	0x00011C134	0x00011C07C	0x00011C014
Page	37	49	41
MODE 0	PRG0_PRU1_GPO13	PRG1_PRU1_GPO9	PRG1_PRU0_GPO4
1	PRG0_PRU1_GPI13	PRG1_PRU1_GPI9	PRG1_PRU0_GPI4
2	PRG0_RGMII2_TD2	PRG1_UART0_RXD	PRG1_RGMII1_RX_CTL
3	PRG0_PWM1_B0	~	PRG1_PWM2_B0
4	RGMII4_TD2	SPI6_CS3	RGMII1_RX_CTL
5	~	RMII6_RXD1	RMII1_TXD0
6	~	MCAN8_TX	~
7	GPIO0_76	GPIO0_30	GPIO0_5
8	~	GPMC0_CSn0	GPMC0_CSn2
9	~	PRG1_IEP0_EDIO_DATA_IN_OUT30	RGMII7_RX_CTL
10	~	VOUT0_DATA9	~
11	~	~	~
12	MCASP1_AXR9	MCASP4_AXR3	MCASP6_AXR2
13	~	~	MCASP6_ACLKR
14	UART8_RTSn	~	UART2_RXD
Bootstrap	~	~	~

P8.23-P8.26#

Pin	P8.23	P8.24	P8.25	P8.26
GPIO	1 31	1 6	1 35	1 51
BALL	AB23	AD20	AH26	AC27
REG	0x00011C080	0x00011C018	0x00011C090	0x00011C0D0
Page	50	41	51	31
MODE 0	PRG1_PRU1_GPO10	PRG1_PRU0_GPO5	PRG1_PRU1_GPO14	PRG0_PRU0_GPO8
1	PRG1_PRU1_GPI10	PRG1_PRU0_GPI5	PRG1_PRU1_GPI14	PRG0_PRU0_GPI8
2	PRG1_UART0_TXD	~	PRG1_RGMII2_TD3	~
3	PRG1_PWM2_TZ_IN	PRG1_PWM3_B2	PRG1_PWM1_A1	PRG0_PWM2_A1
4	~	~	RGMII2_TD3	~
5	RMII6_CRS_DV	RMII1_TX_EN	~	~
6	MCAN8_RX	~	MCAN8_TX	MCAN9_RX
7	GPIO0_31	GPIO0_6	GPIO0_35	GPIO0_51
8	GPMC0_CLKOUT	GPMC0_WEn	RGMII8_TD3	GPMC0_AD2
9	PRG1_IEP0_EDIO_DATA_IN_OUT31	~	~	~
10	VOUT0_DATA10	~	VOUT0_DATA14	~
11	GPMC0_FCLK_MUX	~	~	~
12	MCASP5_ACLKX	MCASP3_AXR0	MCASP9_AXR1	MCASP0_AXR6
13	~	~	MCASP4_AFSR	~
14	~	~	~	UART6_RXD
Bootstrap	~	BOOTMODE0	~	~

P8.27-P8.29#

Pin	P8.27	P8.28	P8.29
GPIO	1 71	1 72	1 73
BALL	AA28	Y24	AA25
REG	0x00011C120	0x00011C124	0x00011C128
Page	36	36	36
MODE 0	PRG0_PRU1_GPO8	PRG0_PRU1_GPO9	PRG0_PRU1_GPO10
1	PRG0_PRU1_GPI8	PRG0_PRU1_GPI9	PRG0_PRU1_GPI10
2	~	PRG0_UART0_RXD	PRG0_UART0_TXD
3	PRG0_PWM2_TZ_OUT	~	PRG0_PWM2_TZ_IN
4	~	SPI3_CS3	~
5	~	~	~
6	MCAN11_RX	PRG0_IEP0_EDIO_DATA_IN_OUT30	PRG0_IEP0_EDIO_DATA_IN_OUT31
7	GPIO0_71	GPIO0_72	GPIO0_73
8	GPMC0_AD10	GPMC0_AD11	GPMC0_AD12
9	~	~	CLKOUT
10	~	DSS_FSYNC3	~
11	~	~	~
12	MCASP1_AFSX	MCASP1_AXR5	MCASP1_AXR6
13	~	~	~
14	~	UART8_RXD	UART8_TXD
Bootstrap	~	~	~

P8.30-P8.32#

Pin	P8.30	P8.31	~	P8.32	~
GPIO	1 74	1 32	1 63	1 26	1 64
BALL	AG26	AJ25	AE29	AG21	AD28
REG	0x00011C12C	0x00011C084	0x00011C100	0x00011C06C	0x00011C104
Page	37	50	34	48	34
MODE 0	PRG0_PRU1_GPO11	PRG1_PRU1_GPO11	PRG0_PRU1_GPO0	PRG1_PRU1_GPO5	PRG0_PRU1_GPO1
1	PRG0_PRU1_GPI11	PRG1_PRU1_GPI11	PRG0_PRU1_GPI0	PRG1_PRU1_GPI5	PRG0_PRU1_GPI1
2	PRG0_RGMII2_TD0	PRG1_RGMII2_TD0	PRG0_RGMII2_RD0	~	PRG0_RGMII2_RD1
3	~	~	~	~	~
4	RGMII4_TD0	RGMII2_TD0	RGMII4_RD0	~	RGMII4_RD1
5	RMII4_TX_EN	RMII2_TX_EN	RMII4_RXD0	RMII5_TX_EN	RMII4_RXD1
6	~	~	~	MCAN6_RX	~
7	GPIO0_74	GPIO0_32	GPIO0_63	GPIO0_26	GPIO0_64
8	GPMC0_A26	RGMII8_TD0	UART4_CTSn	GPMC0_WPn	UART4_RTSn
9	~	EQEP1_I	~	EQEP1_S	~
10	~	VOUT0_DATA11	~	VOUT0_DATA5	~
11	~	~	~	~	~
12	MCASP1_AXR7	MCASP9_ACLKX	MCASP1_AXR0	MCASP4_AXR0	MCASP1_AXR1
13	~	~	~	~	~
14	~	~	UART5_RXD	TIMER_IO4	UART5_TXD
Bootstrap	~	~	~	~	~

P8.33-P8.35#

Pin	P8.33	~	P8.34	P8.35	~
GPIO	1 25	1 111	1 7	1 24	1 116
BALL	AH24	AA2	AD22	AD23	Y3
REG	0x00011C068	0x00011C1C0	0x00011C01C	0x00011C064	0x00011C1D4
Page	48	67	41	47	67
MODE 0	PRG1_PRU1_GPO4	SPI0_CS0	PRG1_PRU0_GPO6	PRG1_PRU1_GPO3	SPI1_CS0
1	PRG1_PRU1_GPI4	UART0_RTSn	PRG1_PRU0_GPI6	PRG1_PRU1_GPI3	UART0_CTSn
2	PRG1_RGMII2_RX_CTL	~	PRG1_RGMII1_RXC	PRG1_RGMII2_RD3	~
3	PRG1_PWM2_B2	~	PRG1_PWM3_A1	~	UART5_RXD
4	RGMII2_RX_CTL	~	RGMII1_RXC	RGMII2_RD3	~
5	RMII2_TXD0	~	RMII1_TXD1	RMII2_RX_ER	~
6	~	~	AUDIO_EXT_REFCLK0	~	PRG0_IEP0_EDIO_OUTVALID
7	GPIO0_25	GPIO0_111	GPIO0_7	GPIO0_24	GPIO0_116
8	RGMII8_RX_CTL	~	GPMC0_CSn3	RGMII8_RD3	PRG0_IEP0_EDC_LATCH_IN0
9	EQEP1_B	~	RGMII7_RXC	EQEP1_A	~
10	VOUT0_DATA4	~	~	VOUT0_DATA3	~
11	VPFE0_DATA13	~	~	VPFE0_WEN	~
12	MCASP8_AXR2	~	MCASP6_AXR3	MCASP8_AXR1	~
13	MCASP8_ACLKR	~	MCASP6_AFSR	MCASP3_AFSR	~
14	TIMER_IO3	~	UART2_TXD	TIMER_IO2	~
Bootstrap	~	~	~	~	~

P8.36-P8.38#

Pin	P8.36	P8.37	~	P8.38	~
GPIO	1 8	1 106	1 11	1 105	1 9
BALL	AE20	Y27	AD21	Y29	AJ20
REG	0x00011C020	0x00011C1AC	0x00011C02C	0x00011C1A8	0x00011C024
Page	42	58	43	58	42
MODE 0	PRG1_PRU0_GPO7	RGMII6_RD2	PRG1_PRU0_GPO10	RGMII6_RD3	PRG1_PRU0_GPO8
1	PRG1_PRU0_GPI7	UART4_RTSn	PRG1_PRU0_GPI10	UART4_CTSn	PRG1_PRU0_GPI8
2	PRG1_IEP0_EDC_LATCH_IN1	~	PRG1_UART0_RTSn	~	~
3	PRG1_PWM3_B1	UART5_TXD	PRG1_PWM2_B1	UART5_RXD	PRG1_PWM2_A1
4	~	~	SPI6_CS2	CLKOUT	~
5	AUDIO_EXT_REFCLK1	TRC_DATA19	RMII5_CRS_DV	TRC_DATA18	RMII5_RXD0
6	MCAN4_TX	EHRPWM5_A	~	EHRPWM_TZn_IN4	MCAN4_RX
7	GPIO0_8	GPIO0_106	GPIO0_11	GPIO0_105	GPIO0_9
8	~	GPMC0_A22	GPMC0_BE0n_CLE	GPMC0_A21	GPMC0_OEn_REn
9	~	~	PRG1_IEP0_EDIO_DATA_IN_OUT29	~	~
10	~	~	OBSCLK2	~	VOUT0_DATA22
11	~	~	~	~	~
12	MCASP3_AXR1	MCASP11_AXR5	MCASP3_AFSX	MCASP11_AXR4	MCASP3_AXR2
13	~	~	~	~	~
14	~	~	~	~	~
Bootstrap	~	~	~	~	~

P8.39-P8.41#

Pin	P8.39	P8.40	P8.41
GPIO	1 69	1 70	1 67
BALL	AC26	AA24	AD29
REG	0x00011C118	0x00011C11C	0x00011C110
Page	35	36	35
MODE 0	PRG0_PRU1_GPO6	PRG0_PRU1_GPO7	PRG0_PRU1_GPO4
1	PRG0_PRU1_GPI6	PRG0_PRU1_GPI7	PRG0_PRU1_GPI4
2	PRG0_RGMII2_RXC	PRG0_IEP1_EDC_LATCH_IN1	PRG0_RGMII2_RX_CTL
3	~	~	PRG0_PWM2_B2
4	RGMII4_RXC	SPI3_CS0	RGMII4_RX_CTL
5	RMII4_TXD0	~	RMII4_TXD1
6	~	MCAN11_TX	~
7	GPIO0_69	GPIO0_70	GPIO0_67
8	GPMC0_A25	GPMC0_AD9	GPMC0_A24
9	~	~	~
10	~	~	~
11	~	~	~
12	MCASP1_AXR3	MCASP1_AXR4	MCASP1_AXR2
13	~	~	~
14	~	UART2_TXD	~
Bootstrap	~	~	~

P8.42-P8.44#

Pin	P8.42	P8.43	P8.44
GPIO	1 68	1 65	1 66
BALL	AB27	AD27	AC25
REG	0x00011C114	0x00011C108	0x00011C10C
Page	35	34	35
MODE 0	PRG0_PRU1_GPO5	PRG0_PRU1_GPO2	PRG0_PRU1_GPO3
1	PRG0_PRU1_GPI5	PRG0_PRU1_GPI2	PRG0_PRU1_GPI3
2	~	PRG0_RGMII2_RD2	PRG0_RGMII2_RD3
3	~	PRG0_PWM2_A2	~
4	~	RGMII4_RD2	RGMII4_RD3
5	~	RMII4_CRS_DV	RMII4_RX_ER
6	~	~	~
7	GPIO0_68	GPIO0_65	GPIO0_66
8	GPMC0_AD8	GPMC0_A23	~
9	~	~	~
10	~	~	~
11	~	~	~
12	MCASP1_ACLKX	MCASP1_ACLKR	MCASP1_AFSR
13	~	MCASP1_AXR10	MCASP1_AXR11
14	~	~	~
Bootstrap	BOOTMODE6	~	~

P8.45-P8.46#

Pin	P8.45	P8.46
GPIO	1 79	1 80
BALL	AG29	Y25
REG	0x00011C140	0x00011C144
Page	38	38
MODE 0	PRG0_PRU1_GPO16	PRG0_PRU1_GPO17
1	PRG0_PRU1_GPI16	PRG0_PRU1_GPI17
2	PRG0_RGMII2_TXC	PRG0_IEP1_EDC_SYNC_OUT1
3	PRG0_PWM1_A2	PRG0_PWM1_B2
4	RGMII4_TXC	SPI3_CLK
5	~	~
6	~	~
7	GPIO0_79	GPIO0_80
8	~	GPMC0_AD13
9	~	~
10	~	~
11	~	~
12	MCASP2_AXR2	MCASP2_AXR3
13	~	~
14	~	~
Bootstrap	~	BOOTMODE3

Connector P9#

The following tables show the pinout of the P9 expansion header. The SW is responsible for setting the default function of each pin. Refer to the processor documentation for more information on these pins and detailed descriptions of all of the pins listed. In some cases there may not be enough signals to complete a group of signals that may be required to implement a total interface.

The column heading is the pin number on the expansion header.

The GPIO row is the expected gpio identifier number in the Linux kernel.

Each row includes the gpiochipX and pinY in the format of X Y. You can use these values to directly control the GPIO pins with the commands shown below.

# to set the GPIO pin state to HIGH
debian@BeagleBone:~$ gpioset X Y=1

# to set the GPIO pin state to LOW
debian@BeagleBone:~$ gpioset X Y=0

For Example:

+---------+----------+
| Pin     | P9.11    |
+=========+==========+
| GPIO    | 1 1      |
+---------+----------+

Use the commands below for controlling this pin (P9.11) where X = 1 and Y = 1

# to set the GPIO pin state to HIGH
debian@BeagleBone:~$ gpioset 1 20=1

# to set the GPIO pin state to LOW
debian@BeagleBone:~$ gpioset 1 20=0

The BALL row is the pin number on the processor.

The REG row is the offset of the control register for the processor pin.

The MODE # rows are the mode setting for each pin. Setting each mode to align with the mode column will give that function on that pin.

If included, the 2nd BALL row is the pin number on the processor for a second processor pin connected to the same pin on the expansion header. Similarly, all row headings starting with 2nd refer to data for this second processor pin.

Important

DO NOT APPLY VOLTAGE TO ANY I/O PIN WHEN POWER IS NOT SUPPLIED TO THE BOARD. IT WILL DAMAGE THE PROCESSOR AND VOID THE WARRANTY.

NO PINS ARE TO BE DRIVEN UNTIL AFTER THE SYS_RESET LINE GOES HIGH.

P9.E1-P9.E4#

E1	E2	E3	E4
USB1 DP	USB1 DN	VSYS_5V0	GND

P9.01-P9.05#

P9.01	P9.02	P9.03	P9.04	P9.05
GND	GND	VOUT_3V3	VOUT_3V3	VIN

P9.06-P9.10#

P9.06	P9.07	P9.08		P9.09	P9.10
VIN	VOUT_SYS \| VOUT_SYS			RESET#	RESET#

P9.11-P9.13#

Pin	P9.11	P9.12	P9.13
GPIO	1 1	1 45	1 2
BALL	AC23	AE27	AG22
REG	0x00011C004	0x00011C0B8	0x00011C008
Page	39	29	40
MODE 0	PRG1_PRU0_GPO0	PRG0_PRU0_GPO2	PRG1_PRU0_GPO1
1	PRG1_PRU0_GPI0	PRG0_PRU0_GPI2	PRG1_PRU0_GPI1
2	PRG1_RGMII1_RD0	PRG0_RGMII1_RD2	PRG1_RGMII1_RD1
3	PRG1_PWM3_A0	PRG0_PWM2_A0	PRG1_PWM3_B0
4	RGMII1_RD0	RGMII3_RD2	RGMII1_RD1
5	RMII1_RXD0	RMII3_CRS_DV	RMII1_RXD1
6	~	~	~
7	GPIO0_1	GPIO0_45	GPIO0_2
8	GPMC0_BE1n	UART3_RXD	GPMC0_WAIT0
9	RGMII7_RD0	~	RGMII7_RD1
10	~	~	~
11	~	~	~
12	MCASP6_ACLKX	MCASP0_ACLKR	MCASP6_AFSX
13	~	~	~
14	UART0_RXD	~	UART0_TXD
Bootstrap	~	~	~

P9.14-P9.16#

Pin	P9.14	P9.15	P9.16
GPIO	1 93	1 47	1 94
BALL	U27	AD25	U24
REG	0x00011C178	0x00011C0C0	0x00011C17C
Page	56	30	56
MODE 0	RGMII5_RD3	PRG0_PRU0_GPO4	RGMII5_RD2
1	UART3_CTSn	PRG0_PRU0_GPI4	UART3_RTSn
2	~	PRG0_RGMII1_RX_CTL	~
3	UART6_RXD	PRG0_PWM2_B0	UART6_TXD
4	VOUT1_DATA8	RGMII3_RX_CTL	VOUT1_DATA9
5	TRC_DATA6	RMII3_TXD1	TRC_DATA7
6	EHRPWM2_A	~	EHRPWM2_B
7	GPIO0_93	GPIO0_47	GPIO0_94
8	GPMC0_A9	~	GPMC0_A10
9	~	~	~
10	~	~	~
11	~	~	~
12	MCASP11_AXR0	MCASP0_AXR2	MCASP11_AXR1
13	~	~	~
14	~	~	~
Bootstrap	~	~	~

P9.17-P9.18#

Pin	P9.17	~	P9.18	~
GPIO	1 28	1 115	1 40	1 120
BALL	AC21	AA3	AH22	Y2
REG	0x00011C074	0x00011C1D0	0x00011C0A4	0x00011C1E4
Page	49	67	53	68
MODE 0	PRG1_PRU1_GPO7	SPI0_D1	PRG1_PRU1_GPO19	SPI1_D1
1	PRG1_PRU1_GPI7	~	PRG1_PRU1_GPI19	~
2	PRG1_IEP1_EDC_LATCH_IN1	I2C6_SCL	PRG1_IEP1_EDC_SYNC_OUT0	I2C6_SDA
3	~	~	PRG1_PWM1_TZ_OUT	~
4	SPI6_CS0	~	SPI6_D1	~
5	RMII6_RX_ER	~	RMII6_TXD1	~
6	MCAN7_TX	~	PRG1_ECAP0_IN_APWM_OUT	~
7	GPIO0_28	GPIO0_115	GPIO0_40	GPIO0_120
8	~	~	~	PRG0_IEP1_EDC_SYNC_OUT0
9	~	~	~	~
10	VOUT0_DATA7	~	VOUT0_PCLK	~
11	VPFE0_DATA15	~	~	~
12	MCASP4_AXR1	~	MCASP5_AXR1	~
13	~	~	~	~
14	UART3_TXD	~	~	~
Bootstrap	~	~	~	~

P9.19-P9.20#

Pin	P9.19	~	P9.20	~
GPIO	2 1	1 78	2 2	1 77
BALL	W5	AF29	W6	AE25
REG	0x00011C208	0x00011C13C	0x00011C20C	0x00011C138
Page	19	38	19	37
MODE 0	MCAN0_RX	PRG0_PRU1_GPO15	MCAN0_TX	PRG0_PRU1_GPO14
1	~	PRG0_PRU1_GPI15	~	PRG0_PRU1_GPI14
2	~	PRG0_RGMII2_TX_CTL	~	PRG0_RGMII2_TD3
3	~	PRG0_PWM1_B1	~	PRG0_PWM1_A1
4	I2C2_SCL	RGMII4_TX_CTL	I2C2_SDA	RGMII4_TD3
5	~	~	~	~
6	~	~	~	~
7	GPIO1_1	GPIO0_78	GPIO1_2	GPIO0_77
8	~	~	~	~
9	~	~	~	~
10	~	~	~	~
11	~	~	~	~
12	~	MCASP2_AXR1	~	MCASP2_AXR0
13	~	~	~	~
14	~	UART2_RTSn	~	UART2_CTSn
Bootstrap	~	~	~	~

P9.21-P9.22#

Pin	P9.21	~	P9.22	~
GPIO	1 39	1 90	1 38	1 91
BALL	AJ22	U28	AC22	U29
REG	0x00011C0A0	0x00011C16C	0x00011C09C	0x00011C170
Page	52	56	52	54
MODE 0	PRG1_PRU1_GPO18	RGMII5_TD0	PRG1_PRU1_GPO17	RGMII5_TXC
1	PRG1_PRU1_GPI18	RMII7_TXD0	PRG1_PRU1_GPI17	RMII7_TX_EN
2	PRG1_IEP1_EDC_LATCH_IN0	I2C3_SDA	PRG1_IEP1_EDC_SYNC_OUT1	I2C6_SCL
3	PRG1_PWM1_TZ_IN	~	PRG1_PWM1_B2	~
4	SPI6_D0	VOUT1_DATA5	SPI6_CLK	VOUT1_DATA6
5	RMII6_TXD0	TRC_DATA3	RMII6_TX_EN	TRC_DATA4
6	PRG1_ECAP0_SYNC_IN	EHRPWM1_A	PRG1_ECAP0_SYNC_OUT	EHRPWM1_B
7	GPIO0_39	GPIO0_90	GPIO0_38	GPIO0_91
8	~	GPMC0_A6	~	GPMC0_A7
9	VOUT0_VP2_VSYNC	~	VOUT0_VP2_DE	~
10	VOUT0_VSYNC	~	VOUT0_DE	~
11	~	~	VPFE0_DATA10	~
12	MCASP5_AXR0	MCASP11_AFSX	MCASP5_AFSX	MCASP10_AXR2
13	~	~	~	~
14	VOUT0_VP0_VSYNC	~	VOUT0_VP0_DE	~
Bootstrap	~	~	BOOTMODE1	~

P9.23-P9.25#

Pin	P9.23	P9.24	~	P9.25	~
GPIO	1 10	1 119	1 13	1 127	1 104
BALL	AG20	Y5	AJ24	AC4	W26
REG	0x00011C028	0x00011C1E0	0x00011C034	0x00011C200	0x00011C1A4
Page	42	68	43	69	54
MODE 0	PRG1_PRU0_GPO9	SPI1_D0	PRG1_PRU0_GPO12	UART1_CTSn	RGMII6_RXC
1	PRG1_PRU0_GPI9	UART5_RTSn	PRG1_PRU0_GPI12	MCAN3_RX	~
2	PRG1_UART0_CTSn	I2C4_SCL	PRG1_RGMII1_TD1	~	~
3	PRG1_PWM3_TZ_IN	UART2_TXD	PRG1_PWM0_A0	~	AUDIO_EXT_REFCLK2
4	SPI6_CS1	~	RGMII1_TD1	SPI2_D0	VOUT1_DE
5	RMII5_RXD1	~	~	EQEP0_S	TRC_DATA17
6	~	~	MCAN4_RX	~	EHRPWM4_B
7	GPIO0_10	GPIO0_119	GPIO0_13	GPIO0_127	GPIO0_104
8	GPMC0_ADVn_ALE	PRG0_IEP1_EDC_LATCH_IN0	~	~	GPMC0_A20
9	PRG1_IEP0_EDIO_DATA_IN_OUT28	~	RGMII7_TD1	~	VOUT1_VP0_DE
10	VOUT0_DATA23	~	VOUT0_DATA17	~	~
11	~	~	VPFE0_DATA1	~	~
12	MCASP3_ACLKX	~	MCASP7_AFSX	~	MCASP10_AXR7
13	~	~	~	~	~
14	~	~	~	~	~
Bootstrap	~	~	~	~	~

P9.26-P9.27#

Pin	P9.26	~	P9.27	~
GPIO	1 118	1 12	1 46	1 124
BALL	Y1	AF24	AD26	AB1
REG	0x00011C1DC	0x00011C030	0x00011C0BC	0x00011C1F4
Page	67	43	30	69
MODE 0	SPI1_CLK	PRG1_PRU0_GPO11	PRG0_PRU0_GPO3	UART0_RTSn
1	UART5_CTSn	PRG1_PRU0_GPI11	PRG0_PRU0_GPI3	TIMER_IO7
2	I2C4_SDA	PRG1_RGMII1_TD0	PRG0_RGMII1_RD3	SPI0_CS3
3	UART2_RXD	PRG1_PWM3_TZ_OUT	PRG0_PWM3_A2	MCAN2_TX
4	~	RGMII1_TD0	RGMII3_RD3	SPI2_CLK
5	~	~	RMII3_RX_ER	EQEP0_B
6	~	MCAN4_TX	~	~
7	GPIO0_118	GPIO0_12	GPIO0_46	GPIO0_124
8	PRG0_IEP0_EDC_SYNC_OUT0	~	UART3_TXD	~
9	~	RGMII7_TD0	~	~
10	~	VOUT0_DATA16	~	~
11	~	VPFE0_DATA0	~	~
12	~	MCASP7_ACLKX	MCASP0_AFSR	~
13	~	~	~	~
14	~	~	~	~
Bootstrap	~	~	~	~

P9.28-P9.29#

Pin	P9.28	~	P9.29	~
GPIO	2 11	1 43	2 14	1 53
BALL	U2	AF28	V5	AB25
REG	0x00011C230	0x00011C0B0	0x00011C23C	0x00011C0D8
Page	18	29	68	31
MODE 0	ECAP0_IN_APWM_OUT	PRG0_PRU0_GPO0	TIMER_IO1	PRG0_PRU0_GPO10
1	SYNC0_OUT	PRG0_PRU0_GPI0	ECAP2_IN_APWM_OUT	PRG0_PRU0_GPI10
2	CPTS0_RFT_CLK	PRG0_RGMII1_RD0	OBSCLK0	PRG0_UART0_RTSn
3	~	PRG0_PWM3_A0	~	PRG0_PWM2_B1
4	SPI2_CS3	RGMII3_RD0	~	SPI3_CS2
5	I3C0_SDAPULLEN	RMII3_RXD1	~	PRG0_IEP0_EDIO_DATA_IN_OUT29
6	SPI7_CS0	~	SPI7_D1	MCAN10_RX
7	GPIO1_11	GPIO0_43	GPIO1_14	GPIO0_53
8	~	~	~	GPMC0_AD4
9	~	~	~	~
10	~	~	~	~
11	~	~	~	~
12	~	MCASP0_AXR0	~	MCASP0_AFSX
13	~	~	~	~
14	~	~	~	~
Bootstrap	~	~	BOOTMODE5	~

P9.30-P9.31#

Pin	P9.30	~	P9.31	~
GPIO	2 13	1 44	2 12	1 52
BALL	V6	AE28	U3	AB26
REG	0x00011C238	0x00011C0B4	0x00011C234	0x00011C0D4
Page	68	29	18	31
MODE 0	TIMER_IO0	PRG0_PRU0_GPO1	EXT_REFCLK1	PRG0_PRU0_GPO9
1	ECAP1_IN_APWM_OUT	PRG0_PRU0_GPI1	SYNC1_OUT	PRG0_PRU0_GPI9
2	SYSCLKOUT0	PRG0_RGMII1_RD1	~	PRG0_UART0_CTSn
3	~	PRG0_PWM3_B0	~	PRG0_PWM3_TZ_IN
4	~	RGMII3_RD1	~	SPI3_CS1
5	~	RMII3_RXD0	~	PRG0_IEP0_EDIO_DATA_IN_OUT28
6	SPI7_D0	~	SPI7_CLK	MCAN10_TX
7	GPIO1_13	GPIO0_44	GPIO1_12	GPIO0_52
8	~	~	~	GPMC0_AD3
9	~	~	~	~
10	~	~	~	~
11	~	~	~	~
12	~	MCASP0_AXR1	~	MCASP0_ACLKX
13	~	~	~	~
14	~	~	~	UART6_TXD
Bootstrap	BOOTMODE4	~	~	~

P9.32-P9.35#

P9.32	P9.34
VDD_ADC	GND

Pin	P9.33	~	P9.35	~
GPIO	~	1 50	~	1 55
BALL	K24	AC28	K29	AH27
REG	0x00011C140	0x00011C0CC	0x00011C148	0x00011C0E0
Page	20	31	20	32
MODE 0	MCU_ADC0_AIN4	PRG0_PRU0_GPO7	MCU_ADC0_AIN6	PRG0_PRU0_GPO12
1	~	PRG0_PRU0_GPI7	~	PRG0_PRU0_GPI12
2	~	PRG0_IEP0_EDC_LATCH_IN1	~	PRG0_RGMII1_TD1
3	~	PRG0_PWM3_B1	~	PRG0_PWM0_A0
4	~	PRG0_ECAP0_SYNC_IN	~	RGMII3_TD1
5	~	~	~	~
6	~	MCAN9_TX	~	~
7	~	GPIO0_50	~	GPIO0_55
8	~	GPMC0_AD1	~	~
9	~	~	~	~
10	~	~	~	DSS_FSYNC0
11	~	~	~	~
12	~	MCASP0_AXR5	~	MCASP0_AXR8
13	~	~	~	~
14	~	~	~	~
Bootstrap	~	~	~	~

P9.36-P9.37#

Pin	P9.36	~	P9.37	~
GPIO	~	1 56	~	1 57
BALL	K27	AH29	K28	AG28
REG	0x00011C144	0x00011C0E4	0x00011C138	0x00011C0E8
Page	20	32	20	32
MODE 0	MCU_ADC0_AIN5	PRG0_PRU0_GPO13	MCU_ADC0_AIN2	PRG0_PRU0_GPO14
1	~	PRG0_PRU0_GPI13	~	PRG0_PRU0_GPI14
2	~	PRG0_RGMII1_TD2	~	PRG0_RGMII1_TD3
3	~	PRG0_PWM0_B0	~	PRG0_PWM0_A1
4	~	RGMII3_TD2	~	RGMII3_TD3
5	~	~	~	~
6	~	~	~	~
7	~	GPIO0_56	~	GPIO0_57
8	~	~	~	UART4_RXD
9	~	~	~	~
10	~	DSS_FSYNC2	~	~
11	~	~	~	~
12	~	MCASP0_AXR9	~	MCASP0_AXR10
13	~	~	~	~
14	~	~	~	~
Bootstrap	~	~	~	~

P9.38-P9.39#

Pin	P9.38	~	P9.39	~
GPIO	~	1 58	~	1 54
BALL	L28	AG27	K25	AJ28
REG	0x00011C13C	0x00011C0EC	0x00011C130	0x00011C0DC
Page	~	33	20	32
MODE 0	MCU_ADC0_AIN3	PRG0_PRU0_GPO15	MCU_ADC0_AIN0	PRG0_PRU0_GPO11
1	~	PRG0_PRU0_GPI15	~	PRG0_PRU0_GPI11
2	~	PRG0_RGMII1_TX_CTL	~	PRG0_RGMII1_TD0
3	~	PRG0_PWM0_B1	~	PRG0_PWM3_TZ_OUT
4	~	RGMII3_TX_CTL	~	RGMII3_TD0
5	~	~	~	~
6	~	~	~	~
7	~	GPIO0_58	~	GPIO0_54
8	~	UART4_TXD	~	~
9	~	~	~	CLKOUT
10	~	DSS_FSYNC3	~	~
11	~	~	~	~
12	~	MCASP0_AXR11	~	MCASP0_AXR7
13	~	~	~	~
14	~	~	~	~
Bootstrap	~	~	~	~

P9.40-P9.42#

Pin	P9.40	~	P9.41	P9.42	~
GPIO	~	1 81	2 0	1 123	1 18
BALL	K26	AA26	AD5	AC2	AJ21
REG	0x00011C134	0x00011C148	0x00011C204	0x00011C1F0	0x00011C04C
Page	20	38	69	68	45
MODE 0	MCU_ADC0_AIN1	PRG0_PRU1_GPO18	UART1_RTSn	UART0_CTSn	PRG1_PRU0_GPO17
1	~	PRG0_PRU1_GPI18	MCAN3_TX	TIMER_IO6	PRG1_PRU0_GPI17
2	~	PRG0_IEP1_EDC_LATCH_IN0	~	SPI0_CS2	PRG1_IEP0_EDC_SYNC_OUT1
3	~	PRG0_PWM1_TZ_IN	~	MCAN2_RX	PRG1_PWM0_B2
4	~	SPI3_D0	SPI2_D1	SPI2_CS0	~
5	~	~	EQEP0_I	EQEP0_A	RMII5_TXD1
6	~	MCAN12_TX	~	~	MCAN5_TX
7	~	GPIO0_81	GPIO1_0	GPIO0_123	GPIO0_18
8	~	GPMC0_AD14	~	~	~
9	~	~	~	~	~
10	~	~	~	~	~
11	~	~	~	~	VPFE0_DATA6
12	~	MCASP2_AFSX	~	~	MCASP3_AXR3
13	~	~	~	~	~
14	~	UART2_RXD	~	~	~
Bootstrap	~	~	~	~	~

P9.43-P9.46#

P9.43	P9.44	P9.45	P9.46
GND	GND	GND	GND

Cape Board Support#

BeagleBone AI-64 has the ability to accept up to four EEPROM addressable expansion boards or capes stacked onto the expansion headers. The word cape comes from the shape of the expansion board for BeagleBone boards as it is fitted around the Ethernet connector on the main board. For BeagleBone this notch acts as a key to ensure proper orientation of the cape. On AI-64 you can see a clear silkscreen marking for the cape orientation. Most of BeagleBone capes can be used with your BeagleBone AI-64 also like shown in BeagleBone AI-64 cape placement below.

Fig. 124 BeagleBone AI-64 cape placement#

This section describes the rules & guidelines for creating capes to ensure proper operation with BeagleBone AI-64 and proper interoperability with other capes that are intended to coexist with each other. Co-existence is not a requirement and is in itself, something that is impossible to control or administer. But, people will be able to create capes that operate with other capes that are already available based on public information as it pertains to what pins and features each cape uses. This information will be able to be read from the EEPROM on each cape.

For those wanting to create their own capes this should not put limits on the creation of capes and what they can do, but may set a few basic rules that will allow the software to administer their operation with BeagleBone AI-64. For this reason there is a lot of flexibility in the specification that we hope most people will find it liberating in the spirit of Open Source Hardware. On the other hand we are sure that there are others who would like to see tighter control, more details, more rules and much more order to the way capes are handled.

Over time, this specification will change and be updated, so please refer to the latest version of this manual prior to designing your own capes to get the latest information.

Warning

Do not apply voltage to any I/O pin when power is not supplied to the board. It will damage the processor and void the warranty.

BeagleBone AI-64 Cape Compatibility#

The expansion headers on BeagleBone Black and BeagleBone AI-64 provides similar pin configuration options on P8 and P9 expansion header pins thus provide cape compatibility to a certain extent. Which means most BeagleBone Black capes will also be compatible with BeeagleBone AI-64.

See BeagleBone cape interface spec for compatibility information.

EEPROM#

Each cape must have its own EEPROM containing information that will allow the software to identify the board and to configure the expansion headers pins during boot as needed. The one exception is proto boards intended for prototyping. They may or may not have an EEPROM on them. An EEPROM is required for all capes sold in order for them operate correctly when plugged into BeagleBone AI-64.

The address of the EEPROM will be set via either jumpers or a dipswitch on each expansion board. Expansion board EEPROM without write protect below is the design of the EEPROM circuit.

../../../_images/eeprom.png — Fig. 125 Expansion board EEPROM without write protect#

The addressing of this device requires two bytes for the address which is not used on smaller size EEPROMs, which only require only one byte. Other compatible devices may be used as well. Make sure the device you select supports 16 bit addressing. The part package used is at the discretion of the cape designer.

EEPROM Address#

In order for each cape to have a unique address, a board ID scheme is used that sets the address to be different depending on the setting of the dipswitch or jumpers on the capes. A two position dipswitch or jumpers is used to set the address pins of the EEPROM.

It is the responsibility of the user to set the proper address for each board and the position in the stack that the board occupies has nothing to do with which board gets first choice on the usage of the expansion bus signals. The process for making that determination and resolving conflicts is left up to the SW and, as of this moment in time, this method is a something of a mystery due to the new Device Tree methodology introduced in the 3.8 kernel.

Address line A2 is always tied high. This sets the allowable address range for the expansion cards to 0x54 to**0x57**. All other I2C addresses can be used by the user in the design of their capes. But, these addresses must not be used other than for the board EEPROM information. This also allows for the inclusion of EEPROM devices on the cape if needed without interfering with this EEPROM. It requires that A2 be grounded on the EEPROM not used for cape identification.

I2C Bus#

The EEPROMs on each expansion board are connected to I2C2 on connector P9 pins 19 and 20. For this reason I2C2 must always be left connected and should not be changed by SW to remove it from the expansion header pin mux settings. If this is done, the system will be unable to detect the capes.

The I2C signals require pullup resistors. Each board must have a 5.6K resistor on these signals. With four capes installed this will result in an effective resistance of 1.4K if all capes were installed and all the resistors used were exactly 5.6K. As more capes are added the resistance is reduced to overcome capacitance added to the signals. When no capes are installed the internal pullup resistors must be activated inside the processor to prevent I2C timeouts on the I2C bus.

The I2C2 bus may also be used by capes for other functions such as I/O expansion or other I2C compatible devices that do not share the same address as the cape EEPROM.

EEPROM Write Protect#

The design in Expansion board EEPROM with write protect has the write protect disabled. If the write protect is not enabled, this does expose the EEPROM to being corrupted if the I2C2 bus is used on the cape and the wrong address written to. It is recommended that a write protection function be implemented and a Test Point be added that when grounded, will allow the EEPROM to be written to. To enable write operation, Pin 7 of the EEPROM must be tied to ground.

When not grounded, the pin is HI via pullup resistor R210 and therefore write protected. Whether or not Write Protect is provided is at the discretion of the cape designer.

../../../_images/eeprom-write-protect.png — Fig. 126 Expansion board EEPROM with write protect#

EEPROM Data Format#

Expansion Board EEPROM shows the format of the contents of the expansion board EEPROM. Data is stored in Big Endian with the least significant value on the right. All addresses read as a single byte data from the EEPROM, but two byte addressing is used. ASCII values are intended to be easily read by the user when the EEPROM contents are dumped.

Table 18 Expansion Board EEPROM#
Name	Offset	Size (bytes)	Contents
Header	0	4	0xAA, 0x55, 0x33, 0xEE
EEPROM Revision	4	2	Revision number of the overall format of this EEPROM in ASCII =A1
Board Name	6	32	Name of board in ASCII so user can read it when the EEPROM is dumped. Up to developer of the board as to what they call the board..
Version	38	4	Hardware version code for board in ASCII.Version format is up to the developer.i.e. 02.1…00A1….10A0
Manufacturer	42	16	ASCII name of the manufacturer. Company or individual’s name.
Part Number	58	16	ASCII Characters for the part number. Up to maker of the board.
Number of Pins	74	2	Number of pins used by the daughter board including the power pins used. Decimal value of total pins 92 max, stored in HEX.
Serial Number	76	12	Serial number of the board. This is a 12 character string which is: WWYY&&&&nnnn where, WW = 2 digit week of the year of production, YY = 2 digit year of production , &&&&=Assembly code to let the manufacturer document the assembly number or product. A way to quickly tell from reading the serial number what the board is. Up to the developer to determine. nnnn = incrementing board number for that week of production
Pin Usage	88	148	Two bytes for each configurable pins of the 74 pins on the expansion connectors, MSB LSB Bit order: 15..14 ….. 1..0 Bit 15….Pin is used or not…0=Unused by cape 1=Used by cape Bit 14-13…Pin Direction…..1 0=Output 01=Input 11=BDIR Bits 12-7…Reserved……..should be all zeros Bit 6….Slew Rate …….0=Fast 1=Slow Bit 5….Rx Enable…….0=Disabled 1=Enabled Bit 4….Pull Up/Dn Select….0=Pulldown 1=PullUp Bit 3….Pull Up/DN enabled…0=Enabled 1=Disabled Bits 2-0 …Mux Mode Selection…Mode 0-7
VDD_3V3B Current	236	2	Maximum current in milliamps. This is HEX value of the current in decimal 1500mA=0x05 0xDC 325mA=0x01 0x45
VDD_5V Current	238	2	Maximum current in milliamps. This is HEX value of the current in decimal 1500mA=0x05 0xDC 325mA=0x01 0x45
SYS_5V Current	240	2	Maximum current in milliamps. This is HEX value of the current in decimal 1500mA=0x05 0xDC 325mA=0x01 0x45
DC Supplied	242	2	Indicates whether or not the board is supplying voltage on the VDD_5V rail and the current rating 000=No 1-0xFFFF is the current supplied storing the decimal quivalent in HEX format
Available	244	32543	Available space for other non-volatile codes/data to be used as needed by the manufacturer or SW driver. Could also store presets for use by SW.

Pin Usage Consideration#

This section covers things to watch for when hooking up to certain pins on the expansion headers.

Expansion Connectors#

A combination of male and female headers is used for access to the expansion headers on the main board. There are three possible mounting configurations for the expansion headers:

Single -no board stacking but can be used on the top of the stack.
Stacking-up to four boards can be stacked on top of each other.
Stacking with signal stealing-up to three boards can be stacked on top of each other, but certain boards will not pass on the signals they are using to prevent signal loading or use by other cards in the stack.

The following sections describe how the connectors are to be implemented and used for each of the different configurations.

Non-Stacking Headers-Single Cape#

For non-stacking capes single configurations or where the cape can be the last board on the stack, the two 46 pin expansion headers use the same connectors. Single expansion connector is a picture of the connector. These are dual row 23 position 2.54mm x 2.54mm connectors.

../../../_images/single-expansion-connector.jpg — Fig. 127 Single expansion connector#

The connector is typically mounted on the bottom side of the board as shown in Single cape expansion connector on BeagleBone Proto Cape with EEPROM from onlogic . These are very common connectors and should be easily located. You can also use two single row 23 pin headers for each of the dual row headers.

../../../_images/proto.jpg — Fig. 128 Single cape expansion connector on BeagleBone Proto Cape with EEPROM from onlogic#

It is allowed to only populate the pins you need. As this is a non-stacking configuration, there is no need for all headers to be populated. This can also reduce the overall cost of the cape. This decision is up to the cape designer.

For convenience listed in Single Cape Connectors are some possible choices for part numbers on this connector. They have varying pin lengths and some may be more suitable than others for your use. It should be noted, that the longer the pin and the further it is inserted into BeagleBone AI-64 connector, the harder it will be to remove due to the tension on 92 pins. This can be minimized by using shorter pins or removing those pins that are not used by your particular design. The first item in**Table 18** is on the edge and may not be the best solution. Overhang is the amount of the pin that goes past the contact point of the connector on BeagleBone AI-64

Table 19 Single Cape Connectors#
SUPPLIER	PARTNUMBER	LENGTH(in)	OVERHANG(in)
Major League	TSHC-123-D-03-145-G-LF	.145	.004
Major League	TSHC-123-D-03-240-G-LF	.240	.099
Major League	TSHC-123-D-03-255-G-LF	.255	.114

The G in the part number is a plating option. Other options may be used as well as long as the contact area is gold. Other possible sources are Sullins and Samtec for these connectors. You will need to ensure the depth into the connector is sufficient

Main Expansion Headers-Stacking#

For stacking configuration, the two 46 pin expansion headers use the same connectors. Expansion Connector is a picture of the connector. These are dual row 23 position 2.54mm x 2.54mm connectors.

The connector is mounted on the top side of the board with longer tails to allow insertion into BeagleBone AI-64. Stacked cape expansion connector is the connector configuration for the connector.

Fig. 130 Stacked cape expansion connector#

For convenience listed in Table 18 are some possible choices for part numbers on this connector. They have varying pin lengths and some may be more suitable than others for your use. It should be noted, that the longer the pin and the further it is inserted into BeagleBone AI-64 connector, the harder it will be to remove due to the tension on 92 pins. This can be minimized by using shorter pins. There are most likely other suppliers out there that will work for this connector as well. If anyone finds other suppliers of compatible connectors that work, let us know and they will be added to this document. The first item in Table 19 is on the edge and may not be the best solution. Overhang is the amount of the pin that goes past the contact point of the connector on BeagleBone AI-64.

The third part listed in Stacked Cape Connectors will have insertion force issues.

Table 20 Stacked Cape Connectors#
SUPPLIER	PARTNUMBER	TAIL LENGTH(in)	OVERHANG(in)
Major League	SSHQ-123-D-06-G-LF	.190	0.049
Major League	SSHQ-123-D-08-G-LF	.390	0.249
Major League	SSHQ-123-D-10-G-LF	.560	0.419

There are also different plating options on each of the connectors above. Gold plating on the contacts is the minimum requirement. If you choose to use a different part number for plating or availability purposes, make sure you do not select the “LT” option.

Other possible sources are Sullins and Samtec but make sure you select one that has the correct mating depth.

Stacked Capes w/Signal Stealing#

Stacked with signal stealing expansion connector figure is the connector configuration for stackable capes that does not provide all of the signals upwards for use by other boards. This is useful if there is an expectation that other boards could interfere with the operation of your board by exposing those signals for expansion. This configuration consists of a combination of the stacking and nonstacking style connectors.

../../../_images/stealing-expansion-connector.jpg — Fig. 131 Stacked with signal stealing expansion connector figure#

Retention Force#

The length of the pins on the expansion header has a direct relationship to the amount of force that is used to remove a cape from BeagleBone AI-64. The longer the pins extend into the connector the harder it is to remove. There is no rule that says that if longer pins are used, that the connector pins have to extend all the way into the mating connector on BeagleBone AI-64, but this is controlled by the user and therefore is hard to control. We have also found that if you use gold pins, while more expensive, it makes for a smoother finish which reduces the friction.

This section will attempt to describe the tradeoffs and things to consider when selecting a connector and its pin length.

BeagleBone AI-64 Female Connectors#

Connector Pin Insertion Depth shows the key measurements used in calculating how much the pin extends past the contact point on the connector, what we call overhang.

To calculate the amount of the pin that extends past the Point of Contact, use the following formula:

Overhang=Total Pin Length- PCB thickness (.062) - contact point (.079)

The longer the pin extends past the contact point, the more force it will take to insert and remove the board. Removal is a greater issue than the insertion.

Signal Usage#

Based on the pin muxing capabilities of the processor, each expansion pin can be configured for different functions. When in the stacking mode, it will be up to the user to ensure that any conflicts are resolved between multiple stacked cards. When stacked, the first card detected will be used to set the pin muxing of each pin. This will prevent other modes from being supported on stacked cards and may result in them being inoperative.

In Cape Header Connectors section of this document, the functions of the pins are defined as well as the pin muxing options. Refer to this section for more information on what each pin is. To simplify things, if you use the default name as the function for each pin and use those functions, it will simplify board design and reduce conflicts with other boards.

Interoperability is up to the board suppliers and the user. This specification does not specify a fixed function on any pin and any pin can be used to the full extent of the functionality of that pin as enabled by the processor.

DO NOT APPLY VOLTAGE TO ANY I/O PIN WHEN POWER IS NOT SUPPLIED TO THE BOARD. IT WILL DAMAGE THE PROCESSOR AND VOID THE WARRANTY.

NO PINS ARE TO BE DRIVEN UNTIL AFTER THE SYS_RESET LINE GOES HIGH.

Cape Power#

This section describes the power rails for the capes and their usage.

Main Board Power#

The Expansion Voltages describes the voltages from the main board that are available on the expansion connectors and their ratings. All voltages are supplied by connector**P9**. The current ratings listed are per pin.

Table 21 Expansion Voltages#
Current	Name	P9	P9	Name	Current
250mA	VDD_3V3B	3	4	VDD_3V3B	250mA
1000mA	VDD_5V	5	6	VDD_5V	1000mA
250mA	SYS_5V	7	8	SYS_5V	250mA

The VSYS_IO_3V3 rail is supplied by the LDO on BeagleBone AI-64 and is the primary power rail for expansion boards. If the power requirement for the capes exceeds the current rating, then locally generated voltage rail can be used. It is recommended that this rail be used to power any buffers or level translators that may be used.

DC_VDD_5V is the main power supply from the DC input jack. This voltage is not present when the board is powered via USB. The amount of current supplied by this rail is dependent upon the amount of current available. Based on the board design, this rail is limited to 1A per pin from the main board.

The VSYS_5V0 rail is the main rail for the regulators on the main board. When powered from a DC supply or USB, this rail will be 5V. The available current from this rail depends on the current available from the USB and DC external supplies.

Expansion Board External Power#

A cape can have a jack or terminals to bring in whatever voltages may be needed by that board. Care should be taken not to let this voltage be fed back into any of the expansion header pins.

It is possible to provide 5V to the main board from an expansion board. By supplying a 5V signal into the DC_VDD_5V rail, the main board can be supplied. This voltage must not exceed 5V. You should not supply any voltage into any other pin of the expansion connectors. Based on the board design, this rail is limited to 1A per pin to BeagleBone AI-64.

There are several precautions that need to be taken when working with the expansion headers to prevent damage to the board.

Do not apply any voltages to any I/O pins when the board is not powered on.
Do not drive any external signals into the I/O pins until after the VSYS_IO_3V3 rail is up.
Do not apply any voltages that are generated from external sources.
If voltages are generated from the DC_VDD_5V signal, those supplies must not become active until after the VSYS_IO_3V3 rail is up.
If you are applying signals from other boards into the expansion headers, make sure you power the board up after you power up the BeagleBone AI-64 or make the connections after power is applied on both boards.

Powering the processor via its I/O pins can cause damage to the processor.

Standard Cape Size#

Cape board dimensions shows the outline of the standard cape. The dimensions are in inches.

A notch is provided for BeagleBone Ethernet connector to stick up higher than the cape when mounted. This also acts as a key function to ensure that the cape is oriented correctly. Space is also provided to allow access to the user LEDs and reset button on BeagleBone board. On BeagleBone AI-64 board align it with the notch on the board silkscreen.

Extended Cape Size#

Capes larger than the standard board size are also allowed. A good example would be the new BeagleBone AI-64 robotics cape. There is no practical limit to the sizes of these types of boards. The notch is also optional, but it is up to the supplier to ensure that the cape is not plugged incorrectly on BeagleBone AI-64 such that damage would be cause to BeagleBone AI-64. Any such damage will be the responsibility of the supplier of such a cape to repair. As with all capes, the EEPROM is required and compliance with the power requirements must be adhered to.

RANDOM PRU STUFF THAT MIGHT NEED A HOME#

Note

I don’t want to blow this information away until I know no work went into it for TDA4VM. It is probably just AM3358 or AM5729 information. :-(

PRU0 and PRU1 Access below shows which PRU-ICSS signals can be accessed on the BeagleBone AI-64 and on which connector and pins they are accessible from. Some signals are accessible on the same pins.

Table 22 PRU0 and PRU1 Access#
	PIN	PROC	NAME
P8	11	R12	GPIO1_13		pr1_pru0_pru_r30_15 (Output)
	12	T12	GPIO1_12		pr1_pru0_pru_r30_14 (Output)
	15	U13	GPIO1_15		pr1_pru0_pru_r31_15 (Input)
	16	V13	GPIO1_14		pr1_pru0_pru_r31_14 (Input)
	20	V9	GPIO1_31	pr1_pru1_pru_r30_13 (Output)	pr1_pru1_pru_r31_13 (INPUT)
	21	U9	GPIO1_30	pr1_pru1_pru_r30_12 (Output)	pr1_pru1_pru_r31_12 (INPUT)
	27	U5	GPIO2_22	pr1_pru1_pru_r30_8 (Output)	pr1_pru1_pru_r31_8 (INPUT)
	28	V5	GPIO2_24	pr1_pru1_pru_r30_10 (Output)	pr1_pru1_pru_r31_10 (INPUT)
	29	R5	GPIO2_23	pr1_pru1_pru_r30_9 (Output)	pr1_pru1_pru_r31_9 (INPUT)
	39	T3	GPIO2_12	pr1_pru1_pru_r30_6 (Output)	pr1_pru1_pru_r31_6 (INPUT)
	40	T4	GPIO2_13	pr1_pru1_pru_r30_7 (Output)	pr1_pru1_pru_r31_7 (INPUT)
	41	T1	GPIO2_10	pr1_pru1_pru_r30_4 (Output)	pr1_pru1_pru_r31_4 (INPUT)
	42	T2	GPIO2_11	pr1_pru1_pru_r30_5 (Output)	pr1_pru1_pru_r31_5 (INPUT)
	43	R3	GPIO2_8	pr1_pru1_pru_r30_2 (Output)	pr1_pru1_pru_r31_2 (INPUT)
	44	R4	GPIO2_9	pr1_pru1_pru_r30_3 (Output)	pr1_pru1_pru_r31_3 (INPUT)
	45	R1	GPIO2_6	pr1_pru1_pru_r30_0 (Output)	pr1_pru1_pru_r31_0 (INPUT)
	46	R2	GPIO2_7	pr1_pru1_pru_r30_1 (Output)	pr1_pru1_pru_r31_1 (INPUT)

P9	17	A16	I2C1_SCL	pr1_uart0_txd
	18	B16	I2C1_SDA	pr1_uart0_rxd
	19	D17	I2C2_SCL	pr1_uart0_rts_n
	20	D18	I2C2_SDA	pr1_uart0_cts_n
	21	B17	UART2_TXD	pr1_uart0_rts_n
	22	A17	UART2_RXD	pr1_uart0_cts_n
	24	D15	UART1_TXD	pr1_uart0_txd	pr1_pru0_pru_r31_16 (Input)
	25	A14	GPIO3_21footnote:[GPIO3_21 is also the 24.576MHZ clock input to the processor to enable HDMI audio. To use this pin the oscillator must be disabled.]	pr1_pru0_pru_r30_5 (Output)	pr1_pru0_pru_r31_5 (Input)
	26	D16	UART1_RXD	pr1_uart0_rxd	pr1_pru1_pru_r31_16
	27	C13	GPIO3_19	pr1_pru0_pru_r30_7 (Output)	pr1_pru0_pru_r31_7 (Input)
	28	C12	SPI1_CS0	eCAP2_in_PWM2_out	pr1_pru0_pru_r30_3 (Output)	pr1_pru0_pru_r31_3 (Input)
	29	B13	SPI1_D0	pr1_pru0_pru_r30_1 (Output)	pr1_pru0_pru_r31_1 (Input)
	30	D12	SPI1_D1	pr1_pru0_pru_r30_2 (Output)	pr1_pru0_pru_r31_2 (Input)
	31	A13	SPI1_SCLK	pr1_pru0_pru_r30_0 (Output)	pr1_pru0_pru_r31_0 (Input)