AMD2901-2909 INST FORMAT - Q 0 1 1 0 B 1 0 0 0 A 1 0 1 D A...

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INSTRUCTION FORMAT AND CONTROLS OF AMD2901 CONTROLS OF AMD2909 Output Control Stack Control Address Selection S1 S0 Source for Y output 0 0 Microprogram counter 0 1 Register (R ) 1 0 Push/pop stack (STK0) 1 1 Direct input (D) FE PUP Stack change 1 - No change 0 1 Increment stack pointer then push current μ PC onto STK0 0 0 Decrement stack pointer ORi zero OE Yi - - 1 Hi-Zi - 0 0 0 1 1 0 1 0 1 0 Source selected by S1, S0 4 bits 4 bits A Address B Address I 8 I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 Ci I 2 I 1 I 0 R S 0 0 0 A Q 0 0 1 A B 0 1 0 0
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Unformatted text preview: Q 0 1 1 0 B 1 0 0 0 A 1 0 1 D A 1 1 0 D Q 1 1 1 D I 5 I 4 I 3 ALU function 0 0 0 R + S +Ci 0 0 1 S – R - Ci 0 1 0 R – S - Ci 0 1 1 R ∨ S 1 0 0 R ∧ S 1 0 1 R ∧ S 1 1 0 R ⊕ S 1 1 1 R • S I 8 I 7 I 6 Y RAM Q 0 0 0 F-F → Q 0 0 1 F--0 1 0 A F → B -0 1 1 F F → B -1 0 0 F F/2 → B Q/2 → Q 1 0 1 F F/2 → B -1 1 0 F 2F → B 2Q → Q 1 1 1 F 2F → B -...
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