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Altera_Forum's avatar
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

This seems to be the behavioral when accessing the slaves with pointers instead of the IORD_DIRECT respectively IOWR_DIRECT function.

Have a look at the avalon interface specification. if a slave has less data bits than the master, the avalon switch fabric performs the full n bits access from the slave as the master has. therefore i highly recommend to use these IORD_DIRECT functions.

in your case IOWR_8DIRECT( address , offset , data ) and IORD_8DIRECT( address, data );

if that does not help, could you please setup signaltap to monitor the avalon interface to your ip (chipselect, address, read, write, waitrequest, data )