请编写一个CPU架构,其中架构要使用IN和IRET命令,并且写出IN指令和IRET指令的微程序方框图和微指令清单
时间: 2024-03-25 20:38:34 浏览: 50
好的,以下是一个基于经典RISC架构的CPU架构,支持IN和IRET命令:
1.指令集
- ADD, SUB, AND, OR, XOR, LSL, LSR, ASR:算术运算和逻辑运算指令
- LD, ST:读取和存储指令
- BR, BNE, BEQ, BLT, BGE, BLE, BGT:分支指令
- IN, OUT:输入和输出指令
- IRET:中断返回指令
2.IN指令的微程序方框图和微指令清单:
微程序方框图:
```
+--------+
| MUX |------+
+--------+ |
| |
v |
+--------+ +--------+ +--------+
| MAR |--->| MEMORY |<---| MDR |
+--------+ +--------+ +--------+
| |
v |
+--------+ |
| IR |------+
+--------+
|
v
+--------+
| IN |
+--------+
```
微指令清单:
| 地址 | 操作码 | 操作 |
| --- | --- | --- |
| 0 | 0000 | MAR <- PC |
| 1 | 0001 | MDR <- MEMORY[MAR] |
| 2 | 0010 | IR <- MDR |
| 3 | 0011 | MUX <- IR[5:0] |
| 4 | 0100 | MAR <- IR[11:6] |
| 5 | 0101 | IN <- INPUT[MUX] |
| 6 | 0110 | MEMORY[MAR] <- IN |
| 7 | 0111 | PC <- PC + 1 |
3.IRET指令的微程序方框图和微指令清单:
微程序方框图:
```
+--------+
| MUX |------+
+--------+ |
| |
v |
+--------+ +--------+ +--------+
| MAR |--->| MEMORY |<---| MDR |
+--------+ +--------+ +--------+
| |
v |
+--------+ |
| IR |------+
+--------+
|
v
+--------+
| IRET |
+--------+
```
微指令清单:
| 地址 | 操作码 | 操作 |
| --- | --- | --- |
| 0 | 0000 | MAR <- SP |
| 1 | 0001 | MDR <- MEMORY[MAR] |
| 2 | 0010 | PC <- MDR |
| 3 | 0011 | SP <- SP + 2 |
| 4 | 0100 | MDR <- MEMORY[SP] |
| 5 | 0101 | PSW <- MDR |
| 6 | 0110 | PC <- PC + 1 |
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