Its easiest for me to think by analogy to DC and AC sim..
if I have a source with a VDC and ACM one will be used in the OP analysis, the other in the AC, XF, SP (the small signal) analyses..
So for that source thats DC for PSS - you use a DC value..
for the PAC, it will add in the PAC magnitude and frequency (thats what different between AC and PAC.. now you need both an ACmag + ACfreq..
spectre:
Code:mag, phase
if you look at the parameters for port source or vsource elements in spectre reference manual
Code:spectre -help vsource
will give you the details
Code:pacmag pacphase
in veriloga module you might use a statement like
Code:vsource #(.dc(1.2), .pacmag(1)) VIN (vin, gnd);