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Visitor
Visitor
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Registered: ‎04-05-2018

SDIO controller capability for Zynq 7020

Hi Sir/Madam,

 

We are using Zynq xc7z020clg-484-1 chip.

 

Is that possible the SDIO controller support block length larger than 512 bytes ?

 

Thanks.

 

Here you will find the Xilinx errata:

http://www.xilinx.com/support/documentation/errata/en208.pdf

 

Copy paste from this errata:

 

<-snip->

SDIO

SD Capability Register Shows Wrong Max_Block_Length Value

Answer Record 47529

The SDIO controller supports a maximum block length of 512 bytes. The SDIO capability register indicates a max length of 4,096 bytes. The software driver must use the 512 byte length and ignore what is read from the capabilities register

<-snap->

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Scholar
Scholar
507 Views
Registered: ‎06-20-2017

I'm confused as to why you're asking something that is clearly specified in AR 47529.

 

If I were you, I'd assume the AR47529 were correct, but if that were a show stopper, I'd do some experimenting (which would very likely be a waste of time).

Mike