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Published byPatricia Horton Modified over 9 years ago
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Evolution in Complexity Evolution in Transistor Count
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Evolution in Speed/Performance
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Intel 4004 Micro- Processor Intel Pentium (II) microprocessor
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Design Abstraction Levels
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Silicon in 2010 Die Area:2.5x2.5 cm Voltage:0.6 V Technology:0.07 m
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Jan M. Rabaey The Devices
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The MOS Transistor
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Current-Voltage Relations
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Dynamic Behavior of MOS Transistor
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THE INVERTERS
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DIGITAL GATES Fundamental Parameters Functionality Reliability, Robustness Area Performance –Speed (delay) –Power Consumption –Energy
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The CMOS Inverter: A First Glance
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VTC of Real Inverter
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Delay Definitions
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CMOS Inverters Polysilicon In Out Metal1 V DD GND PMOS NMOS 1.2 m =2
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Scaling Relationships for Long Channel Devices
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COMBINATIONAL LOGIC
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Overview
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Static CMOS
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Example Gate: NAND
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Transistor Sizing
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4-input NAND Gate In1In2In3In4 Vdd GND Out
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Ratioed Logic
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Pseudo-NMOS
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Dynamic Logic
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Example
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Cascading Dynamic Gates
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Domino Logic
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Where Does Power Go in CMOS?
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SEQUENTIAL LOGIC
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Master-Slave Flip-Flop
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CMOS Clocked SR- FlipFlop
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2 phase non-overlapping clocks
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Pipelining
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Arithmetic Building Blocks
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A Generic Digital Processor
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Building Blocks for Digital Architectures Arithmetic unit - Bit-sliced datapath ( adder, multiplier, shifter, comparator, etc.) Memory - RAM, ROM, Buffers, Shift registers Control - Finite state machine (PLA, random logic.) - Counters Interconnect - Switches - Arbiters - Bus
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Bit-Sliced Design
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Layout Strategies for Bit-Sliced Datapaths
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Layout of Bit-sliced Datapaths
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COPING WITH INTERCONNECT
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Impact of Interconnect Parasitics
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Using Cascaded Buffers
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ISSUES IN TIMING
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The Ellmore Delay
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The Clock Skew Problem
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