Using the information in the truth table in Table, verify that the design for the single- bit outputs in the decoder in Figure is correct.
Table
Instruction BitsControl-Word Bits | |||||||||||
Instruction Function Type | 15 | 14 | 13 | 9 | MB | MD | RW | MW | PL | JB | BC |
Function-unit operations using registers | 0 | 0 | 0 | × | 0 | 0 | 1 | 0 | 0 | × | × |
Memory read | 0 | 0 | 1 | × | 0 | 1 | 1 | 0 | 0 | × | × |
Memory write | 0 | 1 | 0 | × | 0 | × | 0 | 1 | 0 | × | × |
Function-unit operations using register and constant
| 1 | 0 | 0 | × | 1 | 0 | 1 | 0 | 0 | × | × |
Conditional branch on zero (Z) | 1 | 1 | 0 | 0 | × | × | 0 | 0 | 1 | 0 | 0 |
Conditional branch on negative (N) | 1 | 1 | 0 | 0 | × | × | 0 | 0 | 1 | 0 | 0 |
Unconditional jump | 1 | 1 | 1 | × | × | × | 0 | 0 | 1 | 1 | × |
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