Verdin Development Board Errata
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Errata #2:
HAR-3252 – SDIO evaluation kits failing when used in HS400 mode
Affected Version:
Verdin Development Board V1.0B
Fixed in:
Verdin Development Board V1.1A
2.1
Customer Impact
SDIO evaluation kits connected to the SDIO interface of the product may not work correctly at
HS400 mode due to signal integrity issues. Regular SD cards are working fine as expected.
2.2
Description
SDIO interface is failing when SDIO evaluation kits are used in HS400 mode. By default, the
software initiates communication in HS400 mode, which uses a 200MHz clock on the SD_1_CLK
signal; this results in a failed tuning test.
If a mode with lower frequencies is forced, the cards are working fine. This is caused by a signal
integrity issue concerning the clock signal of the SDIO interface.
2.3
Workaround
There is no fix for this issue at the moment. SDIO evaluation kits might need to be used at lower
frequency modes.
