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daiJava's avatar
daiJava
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1 year ago

How to use the SPI protocol to implement data interaction with the UFM of MAX V

Hi all, I have read the handbook for MAX V and have written the verilog code following the timings in the handbook. The mode of SPI is set to mode 0 and the host samples the data on the rising edge...
TingJiangT_Intel's avatar
TingJiangT_Intel
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1 year ago

Have you tried to low the frequency and check whether it becomes better? BTW, could you please show some picture of your test results to help better understand what happened.

  • daiJava's avatar
    daiJava
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    1 year ago

    Hi TingJiangT,

    I lowered the SPICLK frequency to 6.25MHz as per the handbook's clocking requirements, but I still don't see a waveform change on the SO pins. Figure (1) shows the WREN state mentioned in the handbook, which has an Opcode of 0x06. Figure (2) shows the waveform of writing 0x0203 into address 0x0001 of the UFM. Figure (3) shows the waveform of reading data from the address 0x0001 of UFM. After giving 16 as the address, two consecutive 0xff are sent to read the data and it is found that there is no change in the waveform of SO pin and it always remains as z state. So, can you provide some flow of writing data from UFM like first to xx, then xx and finally xx.

    （1）

    （2）

    （3）