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

[daiJava]

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 and changes the data on the falling edge. Unfortunately, while looking at the waveforms on the SPI pins using a logic analyzer, I noticed that the UFM is not responding to the currently issued command via the SO pin. I followed the handbook's instructions and enabled the oscena pin. Also, the SPI has a CLK frequency of 12.5M, so I wonder if this is caused by the CLK frequency being too high. I would also like to ask what additional verilog files I need to add to the project if I want to emulate ufm in Modelsim, similar to how I need to add alter_mf.v when emulating the RAM in the IP core.

[TingJiangT_Intel]

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]

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）