If the controller writes data using PIO mode and later reads the data using ADMA2 mode, the controller fails to send an Auto CMD12 (stop request) during the DMA process and the read FIFO fills up with incorrect data.
Fixed in PS version 2.0 and later. Does not affect production silicon.
This can be avoided by either selecting SDMA mode (instead of ADMA2 mode) when using PIO mode writes or by not using PIO mode to write data.
Impact: | Minor. Refer to the Impact Details below. |
Work-around: | The two-step work-around is described in the Work-around Details below. |
Configurations Affected: | Systems that use the SDIO controller. |
| Device Revision(s) Affected: | Fixed in PS version 2.0 and later. Refer to (Xilinx Answer 47916) - Zynq-7000 SoC Silicon Revision Differences |
Impact Details
If the SD Host controller writes the data to the SD card in the PIO mode and later tries to read the data from the SD card in ADMA2 mode, the Host controller will fail to send Auto CMD12 (stop request) to the SD card. Consequently, the internal FIFOs in the SD Host controller will fill up with incorrect data.
Work-around Details
There are two work-arounds for this issue:
| Answer Number | Answer Title | Version Found | Version Resolved |
|---|---|---|---|
| 47916 | Zynq-7000 AP SoC Devices - Silicon Revision Differences | N/A | N/A |
| AR# 47537 | |
|---|---|
| Date | 05/23/2018 |
| Status | Active |
| Type | Design Advisory |
| Devices | |