I would like to connect SPI IP core of microblaze on custom board but I have some problem. I need 100-400 KHZ clock but the system clk is 100MHz and SPI Clock is 6.25 MHz. Is it necessary to reduce clk frequency for initialization?
I just send CMD0 to reset,I would like to check the write and read buffer to see tranfering of command is correct,but I couldn't get a correct result.
IS anybody can help me ?
Is it necessary to reduce clk frequency for initialization?
Yes. SD cards come up in open drain mode - you also need a pullup. This resistor limits the answer speed of the card until it switches into SPI mode fully.
I did not use microblaze, but the idea is that you should be able to intialize/set up parameters of your SPI block. This will generate your output clock. Otherwise, you need to provide a desired clock to the SPI block. If microblaze dos not generate output clock, you can create one using Clock wizard block.
