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SD/MMC and c5509A

I was trying to interface an SD card C5509A on my custom board. I have successfully implemented Single and multiple block read operations up to 96Mb/s, with 24MHz memory clock and 4-bit parallel mode.

But I don't know what goes wrong when I'm writing to the card, single block write works, but sometimes it hangs forever when I write consequitive blocks even allowing a sufficient delay b/n block writes, it doesn't even timeout. Multiple block write... the card even doesn't respond!

Does anyone tried this before? Is there any sample code?.... I don't know why TI limit info about this particular peripheral, but I've got a lot of heads scratches, and aches trying to work this out

please share your experience on this

thanks in advance