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Altera_Forum's avatar
Altera_Forum
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14 years ago

lpm_latch makes quartus_map run much longer

I am integrating a netlist design which has about 40K latches with async clear or set. If I use LPM_LATCH for these latches then quartus takes very long to map. If I use simple LATCH but pull th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

With recent FPGA families(e.g. Stratix IV), latches can be only implemented as logic loops, because asynchronous functions except for clear have been removed from register capabilities. I don't however understand the difference between the LPM_LATCH and "simple LATCH" implementation.