Forum Discussion

sl242's avatar
sl242
Icon for New Contributor rankNew Contributor
1 year ago
Solved

Agilex 3 AVST programming fails

Hi, We are trying to program an Agilex 3 device over the AVST8 interface, implemented through a CPU using SPI and bit-banging. Setup (see picture below): Data is shifted into a serial-to-paralle...
Board Debug
  • sl242's avatar
    sl242
    11 months ago

    Hi,

    I noticed that the nStatus drops to a low value for a short time, which indicates that something is wrong with the data. I fixed the problem and the programming is working.

    Best regards,

    Samuel

Farabi_Altera's avatar
Farabi_Altera
Icon for Regular Contributor rankRegular Contributor
1 year ago

Hello,


Can you try higher frequency for AVST_CLK? 60kHz is too slow. Can start from 1MHz.

You can also keep AVST_VALID -> high during streaming, even after AVST_READY goes low.

Only send the idle clock cycles after AVST_READY goes low, with AVST_VALID = 0.

Please check signal condition with oscilloscope, is it clean or too noisy.


regards,

Farabi


  • sl242's avatar
    sl242
    Icon for New Contributor rankNew Contributor
    1 year ago

    Hi Farabi,

    >60kHz is too slow

    Is there a time out or something?

    Unfortunately, we cannot increase the speed without further effort. We first need to implement a Linux driver to optimize access to the SPI interface and the pins. I will get back to you in a few weeks. If you have any further ideas, please let me know.

    Best regards,

    Samuel