Hi all,
Uptill now I have only found out people working in either SPI mode to communicate with SD card or in SD mode.
What I want to do is, have microprocessor at one end working in SPI mode, on the other end SD card receives data is SD mode.
The intermediate hardware interfacing these two (microprocessor, SDCARD), is an FPGA.
I need suggestions of how you think I can achieve this goal.
At the moment I have placed five bidirectional buffers in the FPGA, and tried to make a write and read logic in Xilinx. My FPGA knows nothing about what is command or response, it only controls the enables of the bidirectional buffers using a timing diagram.
From the five, four bidirectional buffers are the ioports for parallel data in, parallel data out and the fifth one in connected to the Command pin of SD card.
Thanks in advance.
kamiqash