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Altera_Forum's avatar
Altera_Forum
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14 years ago

DQ and DQS pins

Hello everybody, I would like to know which are the functions of these pins and why are some dedicated pins inside the banks of the fpga. In a hw design, is it necessary to attach the ssra...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi,

DDR memories have to use dedicated pins for data and strobes => dq/dqs.

SRAM is more tolerant and you don't have to use these pins.

Check "external memory interface handbook" (emi.pdf) document if you want to use DDR. The last chapter is a tutorial for DDR.

You can also check altera development kit schematics (choose a kit with similar components) to understand external needs (pull up/down...).