Hi, I am a student and new to OrCAD, I'm trying to do homework that is designing a combinational circuit (4-bit adder/subtractor) and do time domain simulation. But I have some trouble now and I have no idea what mistake a made, I hope someone can help me and I would really appreciate the help, thank you very much!
The schematic is:
The property of each input are:
| M | B1 | B2 | B3 | B4 | A1 | A2 | A3 | A4 | |
| Command 1 | 0ns 0 | 0ns 0 | 0ns 0 | 0ns 0 | 0ns 0 | 0ns 0 | 0ns 0 | 0ns 0 | 0ns 0 |
| Command 2 | 0ns 0 | 100ns 1 | 100ns 1 | 100ns 1 | 100ns 1 | 200ns 1 | 200ns 1 | 200ns 1 | 200ns 1 |
| Command 3 | 300ns 0 | 300ns 0 | 300ns 0 | 300ns 0 | 700ns 0 | 500ns 0 | 500ns 0 | 500ns 0 | |
| Command 4 | 400ns 1 | 500ns 1 | 500ns 1 | 500ns 1 | 900ns 1 | 600ns 1 | 600ns 1 | 600ns 1 | |
| Command 5 | 900ns 0 | 800ns 0 | 800ns 0 | 800ns 0 | 1000ns 0 | 700ns 0 | 700ns 0 | 700ns 0 | |
| Command 6 | 1100ns 1 | 1100ns 1 | 1100ns 1 | 1100ns 1 | 1100ns 1 | 900ns 1 | 900ns 1 | 800ns 1 | |
| Command 7 | 1000ns 0 | 1000ns 0 | 1000ns 0 | ||||||
| Command 8 | 1100ns 1 | 1100ns 1 | 1100ns 1 |
The error I got:
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