Simulating a DAC in Cadence

hi

I am trying to simulate a 8-bit DAC in Cadence I want to input all digitial input combinations from 00000000 to 11111111 (0 to 256) incrementing by 1 each time and also I can also hold it on a specific output to test the circuit. The problem is that is it not very  feasible to set these inputs using 8 vpulse function

how can i solve this problem

thanks