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G_ISAAC's avatar
G_ISAAC
Icon for New Contributor rankNew Contributor
1 year ago

clear of IP ALTMULT_ACCUM (MAC)

I want to use the MAC IP of the IP catalog of quartus (versions 20.1 and 23.1), when I choose to use the asynchronous clear input in order to have reset on the MAC, my output is in high impedance whe...
Hdl
FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
1 year ago

Hi,
an additional question about claimed high impedance output state. How do you determine it and in which configuration?

Output of altmult_accum is a bank of registered LE without a tristate option, there are no internal tristate drivers in FPGA logic. If you instantiate the IP as top level entity, it uses permanently enabled output drivers. I see no way how aclr input could control tristate outputs.