pynq-rpi-ph-adapter

pynq-rpi-ph-adapter is an adapter board that routes all Raspberry and Arduino GPIOs of the Pynq Z2 board to side connectors that are compatible with boards such as adc-board-six-channels, digital-isolator-2t6r, and digital-isolator-6t2r. In total, 48 GPIOs are made available in six different connectors (8 GPIOs per connector).

Board and pinout

A partially populated board mounted on a Pynq Z2 board is shown in Fig. 41. The board’s pinout is shown in Fig. 42. The mapping between the IOs, equivalent Raspberry/Arduino pins and the actual FPGA pins are shown in Table Pin mapping.

Fig. 41 Adapter board mounted on a Pynq Z2.

Fig. 42 Board pinout.

Table 1 Pin mapping

Adapter	Pynq	Zynq	Adapter	Pynq	Zynq
IO 0	RPIO 02	W18	IO 24	RPIO 19	Y8
IO 1	RPIO 03	W19	IO 25	RPIO 20	A20
IO 2	RPIO 04	Y18	IO 26	RPIO 21	Y9
IO 3	RPIO 18	C20	IO 27	AR1	U12
IO 4	RPIO 17	U7	IO 28	AR2	U13
IO 5	RPIO 27	V7	IO 29	AR3	V13
IO 6	RPIO 14	V6	IO 30	RPIO 26	W9
IO 7	RPIO 15	Y6	IO 31	AR0	T14
IO 8	RPIO 23	W6	IO 32	AR4	V15
IO 9	RPIO 22	U8	IO 33	AR5	T15
IO 10	RPIO 10	V8	IO 34	AR7	U17
IO 11	RPIO 9	V10	IO 35	AR9	V18
IO 12	RPIO 8	F19	IO 36	AR10	T16
IO 13	RPIO 11	W10	IO 37	AR SCL	P15
IO 14	RPIO 24	Y7	IO 38	AR6	R16
IO 15	RPIO 25	F20	IO 39	AR8	V17
IO 16	RPIO 07	U19	IO 40	A	Y13
IO 17	RPIO SC	Y17	IO 41	AR13	N17
IO 18	RPIO 05	Y19	IO 42	AR11	R17
IO 19	RPIO 06	U18	IO 43	AR MOSI	T12
IO 20	RPIO 13	W8	IO 44	AR SCK	H15
IO 21	RPIO 16	B19	IO 45	AR SS	F16
IO 22	RPIO SD	Y16	IO 46	AR12	P18
IO 23	RPIO 12	B20	IO 47	AR MISO	W15

Compatible boards

Some boards that compatible with the pynq-rpi-ph-adapter are:

• adc-board-six-channels

• digital-isolator-2t6r

• digital-isolator-6t2r

Connecting compatible boards

There are two possibilities when using the pynq-rpi-ph-adapter with compatible boards. The first option is to solder pin headers on the top of the board, and simply attach a compatible board. The second option is to attach compatible boards via ribbon cables. In this case, the headers must be soldered on the bottom of the adapter board. This is because the ribbon cable matches the pins on both connectors one-to-one, but we need them to be mirrored. For an example of connection via ribbon cables, see Application example.

Notes

• Both 3V3 and 5V are routed to the side connectors (see pinout in Fig. 42). The 3V3 rail is always routed to the connector; however, the 5V rail can be routed to or isolated from the connectors depending on a jumper resistor (see resistor R1 on the schematics of the board).

Application example

Fig. 43 shows the pynq-rpi-ph-adapter board connecting the Pynq board with an experimental dc-dc converter. Compatible boards are attached to the pynq-rpi-ph-adapter board via ribbon cables. For this reason, the male headers were soldered on the bottom of the pynq-rpi-ph-adapter board.

Fig. 43 Pynq adapter combined with compatible boards.

Warning

• TODO: add constraints file

Fabrication files

To get the gerber files used to fabricate the ADC board, checkout commit 48243a0069cdf400ffa442e71829328903b15db7, and find the files under pynq-rpi-ph-adapter/gerber.