MacBook-Pro-de-Oscar.local 2025-5-12:12:19:32

Processeur sur digital logic sim.md

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+---
+aliases: 
+up: 
+tags:
+  - s/informatique
+---
+# Assembleur
+## opérations de l'ALU
+
+| Hex | Bin  | ALU operation         |
+| --- | ---- | --------------------- |
+| 0   | 0000 | A                     |
+| 1   | 0001 | B                     |
+| 2   | 0010 | A+B                   |
+| 3   | 0011 | A-B                   |
+| 4   | 0100 | A XOR B               |
+| 5   | 0101 | A AND B               |
+| 6   | 0110 | A+1                   |
+| 7   | 0111 | A-1                   |
+| 8   | 1000 | ¬A                    |
+| 9   | 1001 | ¬B                    |
+| A   | 1010 | ¬(A+B)                |
+| B   | 1011 | ¬(A-B)                |
+| C   | 1100 | ¬(A XOR B) = A NXOR B |
+| D   | 1101 | ¬(A AND B) = A NAND B |
+| E   | 1110 | ¬(A+1) = -A-2         |
+| F   | 1111 | ¬(A-1) = -A           |
+## branches
+- `100·  ·· JMP to #A`
+- `101·  ·· JMP to #B`
+- `110·  ·· JMP to #RAM[A]`
+- `111·  ·· JMP to #addr`
+
+- `1···  0·00 JMP`
+- `1···  0·01 JMP if A=0`
+- `1···  0·10 JMP if A=B`
+- `1···  0·11 JMP if overflow`
+- `1···  1·00`
+- `1···  1·01 JMP if A≠0`
+- `1···  1·10 JMP if A≠B`
+- `1···  1·11 JMP if overflow`
+