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IDT Programming Using Avnet Reference Design

nima_taie

I am following Avnet reference design from Github to change the frequency of the U13 which is IDT 8T49N242. Everything goes OK, and I get the message IIC EEPROM Test: PASSED message at the end, however, after I power cycle, I still don’t have new clock frequency from the IDT device.

The reference design is programming the EEPROM which is U14, and it is at address 0xA0. However, the  slave address which is indicated in the pzcc_iic_eeprom_test.c source file is at 0x50. I tried to change it to 0xA0, but then the EEROM test fails. After programming the EEPROM, is there anything else I need to do? Why am I not getting the frequency which I want?

I am using Vivado 2015.4 as the reference design requires.

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    Hi Nima,

    It sounds like you should really be using one of our other products.  I would recommend the Mini-ITX.  It has reference designs and was designed to be a root complex.

    If you are still interested in using the IDT clock, we can certainly take a look at that. 
    I would also suggest trying to load up the STOCK 250MHz EEPROM image one more time.  Validate that the hardware is looking good.  From what you are describing, I am afraid that the IDT clock synthesizer might have it's outputs damaged.

    If you would like to use the IDT 8T49N242, IDT has a reference board that allows you to easily program as well as interface the 8T chip to other circuits.  I would suggest using one of those to prototype with.  I highly suggest that chip, although the Mini-ITX does not use it - but this could be added into your product design and evaluated separatly.

    I have also spoken with your local XFAE.  I tried to bring him up to speed on a few things that I think might be going on. 

    Please let me know what you find out from testing with the STOCK 250MHz sdcard binary.  NOTE, you will have to change your boot configuration jumpers in order to have the PicoZed boot from the SDCARD (as you mentioned above you are using JTAG).

    --Dan

  • 0 in reply to drozwood90

    Hi Dan,

    We have done exactly what you suggested. We just haven't received it Mini-ITX yet. Thanks for all the suggestions. 

    I actually got the IDT working as well. I took your advice of not using HCSL output since it DOES need the 50Ohm resistors. 

    I am going to mark this as solved, if you don't mind.

     

    Thanks,

    NIma

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