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Explorer
Explorer
1,093 Views
Registered: ‎07-28-2008

Low Speed I/O muxing between EMIO and PL, any pitfall?

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We have existing SD controller in HDL, we'd like to try to use PS to drive it.

 

Although PS has dedicated pins for SD, but we'd like to start with our existing controller, later on maybe move to PS.

 

Can we realize this by having PS/SD enabled to EMIO and have a MUX inside PL to choose which controller to use.

 

Please comment,

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Xilinx Employee
Xilinx Employee
1,706 Views
Registered: ‎07-30-2007

Re: Low Speed I/O muxing between EMIO and PL, any pitfall?

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Correct. I am not an SD expert, but that's what I'd suggest. You will not be able to use SD as a 1st boot device via EMIO, obviously.
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Xilinx Employee
Xilinx Employee
1,090 Views
Registered: ‎07-30-2007

Re: Low Speed I/O muxing between EMIO and PL, any pitfall?

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Perhaps if you used PL I/O you could use SD EMIO for the PS controller and custom PL.

It is not possible to access the dedicated MIO pins with PL logic.
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Explorer
Explorer
1,089 Views
Registered: ‎07-28-2008

Re: Low Speed I/O muxing between EMIO and PL, any pitfall?

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Thanks for the reply, I think you mean EMIO and PL muxing will work.

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Xilinx Employee
Xilinx Employee
1,707 Views
Registered: ‎07-30-2007

Re: Low Speed I/O muxing between EMIO and PL, any pitfall?

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Correct. I am not an SD expert, but that's what I'd suggest. You will not be able to use SD as a 1st boot device via EMIO, obviously.
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Explorer
Explorer
1,078 Views
Registered: ‎07-28-2008

Re: Low Speed I/O muxing between EMIO and PL, any pitfall?

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Absolutely, I understand PL comes after PS boot.

 

Thanks,

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