figure 3 - gatech.edu

Full Custom

Standard Logic

Progammable Logic (FPLDs) ASICs

Digital Logic

TTL 74xx

CMOS 4xxx PLDs FPGAs

Gate Arrays

Microprocessor & RAM

Standard Cell

CPLDs

Figure 3.1 Digital logic technologies.

PLDs

ASICs

Full CustomVLSI Design

Speed,Density,Complexity,MarketVolumeneeded forProduct

Engineering Cost, Time to Develop Product

CPLDsFPGAs

Figure 3.2 Digital logic technology tradeoffs.

Figure 3.3 Using a PLA to implement a Sum of Products equation.

Figure 3.4 Examples of FPLDs and advanced high pin count package types.

Product-TermSelectMatrix

ClearSelect

Clock/EnableSelect

VCC

PRN

CLRN

ENA

D Q

GlobalClear

GlobalClock

To I/OControl

Block

To PIA

This respresents amultiplexercontrolled by theconfigurationprogram

ProgrammableRegister

36 Signalsfrom PIA

16 ExpanderProduct

Shared LogicExpanders

LAB Local Array

Parallel LogicExpanders(from othermacrocells)

Figure 3.5 MAX 7000 macrocell.

Input/GCLK1Input/OE2/GCLK2

Input/OE1

LAB A

Macrocells1-166-

6-16

16

6-16

I/OControlBlock

6-16I/O Pins

3

LAB C

Macrocells33-486-

6-16

16

6-

I/OControlBlock

6-16I/O Pins

3

LAB B

LAB D

Macrocells17-32

Macrocells49-64

6-16

1

3

6-16

1

3

6-16I/O Pins

6-16I/O Pins

I/OControlBlock

I/OControlBlock

6

6

6

6

PIA

6 OutputInput/GCLRn

6 Output

6-

6-16

6-

6-

Figure 3.6 MAX 7000 CPLD architecture.

LABCTRL1

LABCTRL2

LABPRE/ALOAD

Chip-Wide Reset

AsynchronousClear/Preset/Load Logic

Clock & ClockEnable Select

LABCTRL1

LABCTRL2

LABCLKENA1

LABCLKENA2

Look-UpTable(LUT)

CarryChain

DATA1DATA2DATA3

DATA4

Addnsub

LAB Carry InCarry In1Carry In0

LAB Carry InCarry In1Carry In0

SynchronousLoad and

Clear Logic

Register ChainRouting fromPrevious LE

LAB-WideSynchronous

Load LAB-WideSynchronous

Clear Register Bypass

PRNALDD

QADATA

ENACLRN

RegisterFeedback

ProgrammableRegisterPacked

RegisteredSelect

LUT ChainRouting toNext LE

Row, Column,and DirectLink Routing

Row, Column,and DirectLink Routing

Local Routing

Register ChainOutput

Figure 3.7 Cyclone Logic Element (LE).

4 InputLUT

(16 x 1 RAM)

ABCD

F

AB

CD

F

RAM Contents Address Data

A B C D F 0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 0 0 1 1 0 0 1 0 0 0 0 1 0 1 0 0 1 1 0 1 0 1 1 1 0 1 0 0 0 0 1 0 0 1 0 1 0 1 0 1 1 0 1 1 0 1 1 0 0 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1

Figure 3.8 Using a lookup table (LUT) to model a gate network.

Row Interconnect

LocalInterconnect

LAB LocalInterconnect

LAB

Direct LinkInterconnectfromAdjacentBlock

Direct LinkInterconnect

fromAdjacent

Block

Direct LinkInterconnectto AdjacentBlock

Direct LinkInterconnectto Adjacent

Block

Figure 3.9 Cyclone Logic Array Blocks (LAB) and Interconnects.

Figure 3.10 Silicon wafer containing XC4010E 10,000 gate FPGAs.

Figure 3.11 Single XC4010E FPGA die showing 20 by 20 array of logic elements and interconnect.

Look-UpTable(LUT)

G4G3G2G1

Look-UpTable(LUT)

F4F3F2F1

Look-UpTable(LUT)

S/RControl

S/RControl

H1 DIN/H2 ECSR/H0

1

1

D

EC

SD

RD

Q

D

EC

SDQ

RD

RegisterBypass

RegisterBypass

ProgrammableRegister

ProgrammableRegister

YQ

Y

XQ

X

4C1 • • • C4

K(Clock)

Figure 3.12 Xilinx 4000 Family Configurable Logic Block (CLB).

DeviceProgrammingSimulationDevice

FittingTranslationDesignEntry

Optimization &Synthesis

Figure 3.13 CAD tool design flow for FPLDs.