Zynq PS SDIO
SDIO MIO Settings in PS7 IP Configuration if external level shifter is used:
- speed (slew rate): fast
- pullup: disabled
It is important to disable the pullups, otherwise some SD card may exhibit systematic or random problem at initialization.
Correct settings for SDIO MIO pins, speed fast, pullup disabled.
Level shifter
Modules that expose SDIO Interface on the B2B Connector from 1.8V VCCIO bank need SD Level shifter IC on the baseboard.
When using TXS02612 as SDIO level shifter external pullups should not be used on CMD and DAT lines.
TE0701 and TE0703 have pullup resistor on CMD line, which should be removed:
| Base | CMD pullup Resistor | Removed since |
|---|---|---|
| TE0701 | R43
| TE0701-05 Serial number: TBD |
| TE0703 | R43
| TE0703-04 Serial number: TBD |
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