VLSI - Unit 3 - III

VLSI - Unit 3 - III - Sh0 = 1 B 3 B 2 B 1 B = A 3 A 2 A 1 A...

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EC1461 VLSI Design Unit3: Sub System Design and Layout Dr.Premanand Chandramani SSN College of Engineering 8 th Semester, BE, EEE
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Slide 52 Dept. Of EEE The Binary Shifter A i A i-1 B i B i-1 Right Left nop Bit-Slice i ...
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Slide 53 Dept. Of EEE The Barrel Shifter Sh3 Sh2 Sh1 Sh0 Sh3 Sh2 Sh1 A 3 A 2 A 1 A 0 B 3 B 2 B 1 B 0 : Control Wire : Data Wire Area Dominated by Wiring
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Slide 54 Dept. Of EEE Parallel Programmable Shifters D a t I n Control = O u Shift amount Shift direction Shift type (logical, arith, circular) Shifters used in multipliers, floating point units Consume lots of area if done in random logic gates
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Slide 55 Dept. Of EEE A Programmable Binary Shifter rgt nop left A i A i-1 B i-1 B i 0 A 0 1 0 0 A 0 A 1 A 1 0 0 0 1 A 0 A 1 A 0 A 1 0 1 0 A 0 A 1 B i-1 B i left nop rgt A i-1 A i
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Slide 56 Dept. Of EEE A Programmable Binary Shifter rgt nop left A i A i-1 B i-1 B i 0 A 0 1 0 0 A 0 A 1 A 1 0 0 0 1 A 0 A 1 A 0 A 1 0 1 0 A 0 A 1 B i-1 B i left nop rgt A i-1 A i
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Slide 57 Dept. Of EEE 4-bit Barrel Shifter A 0 A 1 A 2 A 3 B 0 B 1 B 2 B 3 Sh1 Sh2 Sh3 Sh0 Sh1 Sh2 Sh3 Example:
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Unformatted text preview: Sh0 = 1 B 3 B 2 B 1 B = A 3 A 2 A 1 A Sh1 = 1 B 3 B 2 B 1 B = A 3 A 3 A 2 A 1 Sh2 = 1 B 3 B 2 B 1 B = A 3 A 3 A 3 A 2 Sh3 = 1 B 3 B 2 B 1 B = A 3 A 3 A 3 A 3 Area dominated by wiring Slide 58 Dept. Of EEE 4-bit Barrel Shifter A A 1 A 2 A 3 B B 1 B 2 B 3 Sh1 Sh2 Sh3 Sh0 Sh1 Sh2 Sh3 Example: Sh0 = 1 B 3 B 2 B 1 B = A 3 A 2 A 1 A Sh1 = 1 B 3 B 2 B 1 B = A 3 A 3 A 2 A 1 Sh2 = 1 B 3 B 2 B 1 B = A 3 A 3 A 3 A 2 Sh3 = 1 B 3 B 2 B 1 B = A 3 A 3 A 3 A 3 Area dominated by wiring Slide 59 Dept. Of EEE 4x4 barrel shifter Buffer Sh3 S h2 Sh 1 Sh0 A 3 A 2 A 1 A Width barrel ~ 2 p m M...
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VLSI - Unit 3 - III - Sh0 = 1 B 3 B 2 B 1 B = A 3 A 2 A 1 A...

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