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Altera_Forum's avatar
Altera_Forum
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14 years ago

what is fast input？

What's the meaning of fast input/fast output/fast output enable register? How can I find the information of the conception? I googled, but found nothing... Thank you so much!
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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What is the difference between FAST_OUTPUT_REGISTER and FAST_OUTPUT_ENABLE_REGISTER?

Should they be used simultaneousely or either one of them for Cyclone IV GX with LPM_DFF just before ouput pin?

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There are 3 different io registers (input, output, OE). I will use them (if applicable) to improve io speed.

If your final output is enabled through another registered signal then you can use OE register.