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Altera_Forum
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16 years ago

read from scfifo wrong!how to use it?

read from scfifo wrong! my fist read data should be 40h,but now is 00h. left picture is from ALERA ,right picture is from my singalTapII, whether phase position has some problem?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

What settings did you use when you instantiated the scfifo?

Your results look consistent. You need to put rdreq at 1 before the rising edge of your clock. In your case the rdreq is taken in account one cycle after your green line.