Hello All,

I'm trying to learn about the SDIO protocol to design an SDIO FPGA peripherial in VHDL.
I started to read the "SDIO Card Simplified Specification, Part E1, v2.00".
The info in this file seems a little vauge and I don't understand it very well.

I want the peripherial to support ALL the features and be FULLY compatible with the standart.
Can someonle help me start?
What is the best source to learn from?