microSD

The ECPIX-5 is equiped with a microSD slot. Being wired to a SERDES, it is capable of theoratically achieving UHS-II speeds. A IP4856CX25 level translator allows for dual 1.8V/3.3V SD operation and provides ESD protection.

Pinout

SD

microSD card pin	FPGA pin	Description
CMD	M24	Command/response
CLK	P24	Clock
CD	L22	Card Detect
DAT0	N26	Data line (bit 0)
DAT1	N25	Data line (bit 1)
DAT2	N23	Data line (bit 2)
DAT3	N21	Data line (bit 3)
D0+	AD19	UHS-II lane 0 (Positive)
D0-	AD20	UHS-II lane 0 (Negative)
D1+	AF18	UHS-II lane 1 (Positive)
D1-	AF19	UHS-II lane 1 (Negative)

Level translator

Level translator pin	FPGA pin	Description
SEL	L24	IO voltage selection (High = 1.8V, Low = 3.3V)
CLK_FB	P25	Clock feedback
DIR_CMD	M23	CMD direction (High = Input, Low = Output)
DIR_0	N24	DAT0 direction (High = Input, Low = Output)
DIR_1_3	P26	DAT1-3 direction (High = Input, Low = Output)