QSPI Pmod

A QSPI Pmod board designed in KiCad with one SPI Flash and two PSRAMs.

Pinout

Pmod	TinyTapeout	Function	Note
PMOD1	uio[0]	CS0 (Flash)	Cut trace to disable (see below)
PMOD2	uio[1]	SD0/MOSI
PMOD3	uio[2]	SD1/MISO
PMOD4	uio[3]	SCK	Short CK ("CLOCK cap") pin pair for delay by 22pF cap
PMOD5	uio[4]	SD2
PMOD6	uio[5]	SD3
PMOD7	uio[6]	CS1 (RAM A)	Cut trace to disable (see below)
PMOD8	uio[7]	CS2 (RAM B)	Cut trace to disable (see below)

[!NOTE] On the bottom side of the PCB, you can cut the traces for any of the 3 CS pins to disable its respective memory IC. When cut, a 1k resistor pulls up the chip's /CS to disable it. In this case, the respective pin could be used (via header thru-hole on the other side of the cut) as either an input or output.