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Altera_Forum's avatar
Altera_Forum
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16 years ago

SD card controller in vhdl

Hey everyone! I'm currently trying to develop a sdcard controller in vhdl to just read data off the sd card using spi transmission. The board im using is DE1 educational board. I have been tryi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hey everyone,

Found out that it there is not much difference with the port assignment for sd bus mode and spi. However i have a new question. Hope some one will help me out :). In spi mode for sd card protocol, is it possible to shift data and read data at the rising edge of the SCK? I have studied spi master module and i find out that data usually is sampled at the rising edge and shifted at the falling edge for CPOL =0 and CPHA =0. But i just wanted to know if i were to sample and shift at rising_edge for sd card spi protocol will that cause me a problem when sending and receiving data?

Regards,

Yangz86