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Altera_Forum's avatar
Altera_Forum
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15 years ago

Required Nios components

Hello, I am trying to develop a very simple Nios cpu to run Hello world application. I have created a design: http://i55.tinypic.com/a29isy.jpg As You can see, I have inserted DDR2 memory ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Are the byte enable signals correctly connected to your 16-bits SRAM? Looking at your text again, it seem that on each 16-bit word is in fact the second byte repeated twice (I don't know if it is very clear, expressed like that). It could be that when the CPU is trying to do a 8-bit write to memory using byte enables, the memory write the same byte twice instead.

It should be possible to test 8-bit writes using custom HDL or the system console tools.