CSCI 255, ENGR 274, ECE 212 -- 30 November, 2000

Announcements

Field Programmable Gate Array

Example FPGA

Abstract FPGA taken taken from Programmable Logic FAQ

Internal array of programmable logic blocks
Edge of programmable I/O blocks
All surrounded by an interconnect
Heavy use of placement and routing algorithms
Example -- Xilinx Spartan-II
Cost -- about 10¢ a CLB

Spartan-II Configurable Logic Block

4-input look-up tables -- 16-bit RAM
- Additional RAM available on the FPGA
arithmetic logic
multiplexers
D flip-flops

Spartan-II Configurable Logic Block

CLB image taken taken from Spartan-II 2.5V FPGA Familty: Functional Description

Microcontrollers

processor ship units

A word on transmission gates

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Java applet referenced from the Java CMOS technology demonstration page at Uni Hamburg

Used in CMOS chips
- No, you can't buy one in TTL
Implemented with two transistors
- pMOS transmits ones well
  - open when control is low
  - closed when control is hig
- nMOS transmits zeroes well
  - open when control is high
  - closed when control is low
Works well for building multiplexers