When multiplying 36 bits by 36 bits using four 18x18 multipliers, the sign bits of the higher 18-bit parts of the multipliers were correctly switched, but what was incorrect was leaving the sign bits of the lower parts of the multipliers uninitialized. They now connect to VSS.
When multiplying 36 bits by 36 bits using four 18x18 multipliers, the sign bits of the higher 18-bit parts of the multipliers were correctly switched, but what was incorrect was leaving the sign bits of the lower parts of the multipliers uninitialized. They now connect to VSS.
Addresses https://github.com/YosysHQ/apicula/issues/242