Data Sheet

Compute Module 3+ Datasheet

All GPIOs except GPIO28, 29, 44 and 45 have weak in-pad pull-ups or pull-downs enabled when the

device is powered on. It is recommended to add off-chip pulls to GPIO28, 29, 44 and 45 to make sure

they never ﬂoat during power on and initial boot.

9.1.1 GPIO Alternate Functions

Default

GPIO Pull ALT0 ALT1 ALT2 ALT3 ALT4 ALT5

0 High SDA0 SA5 PCLK - - -

1 High SCL0 SA4 DE - - -

2 High SDA1 SA3 LCD VSYNC - - -

3 High SCL1 SA2 LCD HSYNC - - -

4 High GPCLK0 SA1 DPI D0 - - ARM TDI

5 High GPCLK1 SA0 DPI D1 - - ARM TDO

6 High GPCLK2 SOE N DPI D2 - - ARM RTCK

7 High SPI0 CE1 N SWE N DPI D3 - - -

8 High SPI0 CE0 N SD0 DPI D4 - - -

9 Low SPI0 MISO SD1 DPI D5 - - -

10 Low SPI0 MOSI SD2 DPI D6 - - -

11 Low SPI0 SCLK SD3 DPI D7 - - -

12 Low PWM0 SD4 DPI D8 - - ARM TMS

13 Low PWM1 SD5 DPI D9 - - ARM TCK

14 Low TXD0 SD6 DPI D10 - - TXD1

15 Low RXD0 SD7 DPI D11 - - RXD1

16 Low FL0 SD8 DPI D12 CTS0 SPI1 CE2 N CTS1

17 Low FL1 SD9 DPI D13 RTS0 SPI1 CE1 N RTS1

18 Low PCM CLK SD10 DPI D14 - SPI1 CE0 N PWM0

19 Low PCM FS SD11 DPI D15 - SPI1 MISO PWM1

20 Low PCM DIN SD12 DPI D16 - SPI1 MOSI GPCLK0

21 Low PCM DOUT SD13 DPI D17 - SPI1 SCLK GPCLK1

22 Low SD0 CLK SD14 DPI D18 SD1 CLK ARM TRST -

23 Low SD0 CMD SD15 DPI D19 SD1 CMD ARM RTCK -

24 Low SD0 DAT0 SD16 DPI D20 SD1 DAT0 ARM TDO -

25 Low SD0 DAT1 SD17 DPI D21 SD1 DAT1 ARM TCK -

26 Low SD0 DAT2 TE0 DPI D22 SD1 DAT2 ARM TDI -

27 Low SD0 DAT3 TE1 DPI D23 SD1 DAT3 ARM TMS -

Table 9: GPIO Bank0 Alternate Functions

16 Release 2