Evolution in Complexity

1
Evolution in Complexity
Evolution in Transistor Count
2
Evolution in Speed/Performance
3
Intel 4004 Micro-Processor
Intel Pentium (II) microprocessor
4
Design Abstraction Levels
5
Silicon in 2010
Die Area 2.5x2.5 cm Voltage 0.6
V Technology 0.07 ?m
6
The Devices

• Jan M. Rabaey

7
The MOS Transistor
8
Current-Voltage Relations
9
Dynamic Behavior of MOS Transistor
10
THE INVERTERS
11
DIGITAL GATES Fundamental Parameters

• Functionality
• Reliability, Robustness
• Area
• Performance
• Speed (delay)
• Power Consumption
• Energy

12
The CMOS Inverter A First Glance
13
VTC of Real Inverter
14
Delay Definitions
15
CMOS Inverters
1.2
m
m
2l
Out
In
GND
16

Scaling Relationships for Long Channel Devices
17
COMBINATIONAL LOGIC
18
Overview
19
Static CMOS
20
Example Gate NAND
21
Transistor Sizing
22
4-input NAND Gate
Vdd
Out
GND
In1
In2
In3
In4
23
Ratioed Logic
24
Pseudo-NMOS
25
Dynamic Logic
26
Example
27
Cascading Dynamic Gates
28
Domino Logic
29
Where Does Power Go in CMOS?
30
SEQUENTIAL LOGIC
31
Master-Slave Flip-Flop
32
CMOS Clocked SR- FlipFlop
33
2 phase non-overlapping clocks
34
Pipelining
35
Arithmetic Building Blocks
36
A Generic Digital Processor
37
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
38
Bit-Sliced Design
39
Layout Strategies for Bit-Sliced Datapaths
40
Layout of Bit-sliced Datapaths
41
COPING WITH INTERCONNECT
42
Impact of Interconnect Parasitics
43
Using Cascaded Buffers
44
ISSUES IN TIMING
45
The Elmore Delay
46
The Clock Skew Problem