Logic Design for Array-Based Circuits

by Donnamaie E. White

Copyright © 1996, 2001, 2002 Donnamaie E. White

 

Case Study: Sizing A Design

Last Edit July 22, 2001


FURTHER THOUGHT

For cell usage, timing, power, and added ground requirements, the basic OE14S solution is the best pro-posed so far.

Table A-7 OE14S Solution

Table A-8 OE14S Solution

This version used GT87D instead of a GT08L. It uses GT60S macros in the gate tree instead of GT60L macros. Do the MUX and reset buffer trees need S-macros or could L-option macros be used? (Watch it - the options have different maximum frequency of operation numbers! This is often overlooked in choosing options.)


The DC power computed by the AMCCERC program is summarized below. Remember - AC power dissipation must be added to this. AC power compu-tations required depend on the array series.

Table A-8b Macro Occurrence Report Continued

Exercise

Add a design objective to reduce power to 5 Watts or as close to it as possible and modify this circuit using the latest library information. The frequency of operation requirement remains.

This same exercise was used in the AMCC training classes through several library releases. This problem, or one close to it, was actually used for over eleven years with several technology libraries, bipolar, Bi-squared MOS and CMOS. It demonstrates nearly 85% of the array design rules.

Today's designers would create this circuit in Verilog or VHDL and a control script for the synthesis tool. Constraints can drive area reduction, speed improvements or power reduction. The script can also set the priority for the different design constraints.

 

 

 

Copyright @ 2001, 2002 Donnamaie E. White, White Enterprises
For problems or questions on these pages, contact dew@Donnamaie.com

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