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Altera_Forum's avatar
Altera_Forum
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17 years ago

avalon mm byte enable

In the project we are currently working on, we want to read and write pixels to external DDR SDRAM. We need to be able to use byte-mask / byte-enable bits to not overwrite some previously writt...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

In your system console code are you reading from 0, 4, 8, etc...? (that's what it looks like to me). If that's the case then everything looks fine to me. If you want to access each 16-bit word you should be coding your .tcl file to read from 0, 2, 4, 6, 8, etc.... Again don't worry about the master itself, it'll do the right thing by presenting the following sequence: 


Address         Byteenables
0                     0011
0                     1100
4                     0011
4                     1100
8                     0011
8                     1100
etc...