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Shifters Lecture L7.4 Section 7.4
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MODULE shift TITLE 'shifter' DECLARATIONS " INPUT PINS " D3..D0 PIN 11,7,6,5; D = [D3..D0]; s2..s0 PIN 3,2,1; S = [s2..s0]; " OUTPUT PINS " Y3..Y0 PIN 40,41,43,44 ISTYPE 'com'; Y = [Y3..Y0]; noshift = [D3,D2,D1,D0]; shr = [0,D3,D2,D1]; shl = [D2,D1,D0,0 ]; ror = [D0,D3,D2,D1]; rol = [D2,D1,D0,D3]; asr = [D3,D3,D2,D1]; ror2 = [D1,D0,D3,D2]; EQUATIONS
![MODULE shift TITLE shifter DECLARATIONS INPUT PINS D3..D0 PIN 11,7,6,5; D = [D3..D0]; s2..s0 PIN 3,2,1; S = [s2..s0]; OUTPUT PINS Y3..Y0 PIN 40,41,43,44 ISTYPE com ; Y = [Y3..Y0]; noshift = [D3,D2,D1,D0]; shr = [0,D3,D2,D1]; shl = [D2,D1,D0,0 ]; ror = [D0,D3,D2,D1]; rol = [D2,D1,D0,D3]; asr = [D3,D3,D2,D1]; ror2 = [D1,D0,D3,D2]; EQUATIONS](http://images.slideplayer.com/16/5132638/slides/slide_4.jpg "MODULE shift TITLE shifter DECLARATIONS INPUT PINS D3..D0 PIN 11,7,6,5; D = [D3..D0]; s2..s0 PIN 3,2,1; S = [s2..s0]; OUTPUT PINS Y3..Y0 PIN 40,41,43,44 ISTYPE com ; Y = [Y3..Y0]; noshift = [D3,D2,D1,D0]; shr = [0,D3,D2,D1]; shl = [D2,D1,D0,0 ]; ror = [D0,D3,D2,D1]; rol = [D2,D1,D0,D3]; asr = [D3,D3,D2,D1]; ror2 = [D1,D0,D3,D2]; EQUATIONS")
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EQUATIONS when (S == 0) then Y = noshift; when (S == 1) then Y = shr; when (S == 2) then Y = shl; when (S == 3) then Y = ror; when (S == 4) then Y = rol; when (S == 5) then Y = asr; when (S == 6) then Y = ror2; when (S == 7) then Y = noshift;
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@radix 16; test_vectors ([D,S] -> Y) [0B,0] -> 0B; [0B,1] -> 5; [0B,2] -> 6; [0B,3] -> 0D; [0B,4] -> 7; [0B,5] -> 0D; [0B,6] -> 0E; [0B,7] -> 0B; END
![@radix 16; test_vectors ([D,S] -> Y) [0B,0] -> 0B; [0B,1] -> 5; [0B,2] -> 6; [0B,3] -> 0D; [0B,4] -> 7; [0B,5] -> 0D; [0B,6] -> 0E; [0B,7] -> 0B; END](http://images.slideplayer.com/16/5132638/slides/slide_6.jpg "@radix 16; test_vectors ([D,S] -> Y) [0B,0] -> 0B; [0B,1] -> 5; [0B,2] -> 6; [0B,3] -> 0D; [0B,4] -> 7; [0B,5] -> 0D; [0B,6] -> 0E; [0B,7] -> 0B; END")
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