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Altera_Forum's avatar
Altera_Forum
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14 years ago

altsyncram in simple dual-port mode

Hi, the altsyncram in simple dual-port mode does not seem to work correctly. It appears to have some internal pipelining on the data and address inputs relative to the wren and even each other. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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the modelsim model seems to work slightly differently than the actual FPGA-based instantiation (shown with Signal Tap).

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Post your testbench, the testbench waveforms and your SignalTapII waveforms.

I've never had any issues with Modelsim vs SignalTap with the altsyncram component (except for the time I used a newer version of Modelsim-SE, rather than the Modelsim-ASE version shipped with Quartus). Though I've only ever used it in single-port or dual-port mode. Perhaps simple dual-port has an issue. You could try it in dual-port mode and see if that changes the results.

Cheers,

Dave