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Altera_Forum
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13 years ago

DFFEAS (SLOAD vs D input difference?)

I have been coding a simple FSM and datapath in Quartus II 11.1, When I examine the post-fit netlist in the Technology Viewer, I notice that certain registers/flip flops have the "normal" setu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

By coming in through the D or SDATA, the router has multiple "choices" to get into the FF. If they both satisfy the design, i.e. make the connection and make timing, I believe the router can do either and it adds flexibility. I've had problems trying to script ECOs because of this, because on one compile it may use the D, another the SDATA, another it may go through the LUT as a pass-thru. None of these are wrong though.