AM623: interfacing with FPGA

Kien

Expert 4216 points

Part Number: AM623

Hi Champs,

I am trying to figure out the best approach for AM623 to read data from an FPGA at 8Mbps.

What is the recommended interface for FPGA: GPMC or OSPI?

If both are possible, could you please provide a comparison that shows pros and cons of each?

If using OSPI:

Does TI have any SW examples, especially for the FPGA to emulate flash and/or PSRAM?
Is it possible to use DMA to meet the data reading rate, ie. 8Mbps?

If using GPMC:

How to handle the boot mode pins since they are muxed with some GPMC pins?
Is there any EVM that exposes GPMC interface to external?

Regards,

Kien

21 days ago

+1 Stanislav Stilyanov 20 days ago

TI__Mastermind 22850 points

Hi Kien,

GPMC is a common way interfacing to FPGA. FPGA needs to emulate flash/pseudo-RAM device.

I assume you mean 8 megabytes per second, then yes, this is feasible.

BOOTMODE pins needs to be driven only by pullups/pulldowns. The external device like FPGA needs to be HiZ during BOOTMODE sampling time right after MCU_PORz.

Regards,

Stan

0 Kien 17 days ago in reply to Stanislav Stilyanov

TI__Expert 4216 points

Hello Stan,

Thanks for your response. Unfortunately the existing HW board doesn't have GPMC available for the FPGA, so we're trying to see if we can use OSPI instead.

Can you give us some advices on what needs to be done and what TI offers in this case, ie. using OSPI?

Regards,

Kien

0 Stanislav Stilyanov 16 days ago in reply to Kien

TI__Mastermind 22850 points

Hello Kien,

Unfortunately I don't have any experience with OSPI to FPGA. I will have to check internally. Meanwhile I've found several customer E2E threads regarding OSPI - FPGA and they have received some support from TI.

Regards,

Stan

0 Kien 16 days ago in reply to Stanislav Stilyanov

TI__Expert 4216 points

Stan,

Thanks for your help. Appreciated.

Regards,

Kien

0 Vaibhav Kumar 15 days ago

TI__Guru 52923 points

Hi Kien,

Could you hand us any FPGA part number you are planning to use?

The datasheet of that would be helpful.

Regards,

Vaibhav

0 Kien 2 hours ago in reply to Vaibhav Kumar

TI__Expert 4216 points

Hello Vaibhav,

I'd like to follow up with you on the OSPI interface to FPGA.

It's Xilinx XC7A50.

Regards,

Kien

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AM623: interfacing with FPGA