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Altera_Forum
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16 years ago

Interfacing Custom Component

Recently I built custom component of SDCARD. What I'm trying to make is an easy interfacing with the SDCARD module I built based on VHDL. I want to read or write from the SDCARD Mem only by usin...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I think you're heading down the wrong path here. Let's go back to basics.

1 - Your VHDL component. It has a data width of 8 bits correct?. Please read section 3.6.1 of the following document:

http://www.altera.com/literature/manual/mnl_avalon_spec.pdf

My recommendation is that you make your component have a 32-bit data width regardless of the fact that you are only going to use 8 bits.

2 - Why are you using the PIO macros for acessing your component? I recommend you use the IOWR and IORD macro directly.

Start with these. If this doesn't fix your problem, let me know.

Jake