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


THE SCHEMATICS

Page 1 - Chip Macro and added Ground (IEVCC for ECL VCC);
AAA is switch group tag; GT87D a static driver


Page 2 - Clock tree; RESET tree; 2:1 MUX select tree. Buffer trees go to various pages. Note the inputs to the parametric gate tree. "40"s are FOD values.
(Figure A-10, Figure A-11, Figure A-12, Figure A-13)


Page 3 - 2:1 MUX selects and enable controls; 6-bit input-output path. OE42S macros should be replaced and VLO signal deleted.


Page 4 - Using MX21S 4:1 MUX macros to built a 16:1 MUX. OE42 should be changed.


Page 5 - pipelined register: 2:1 MUX-D F/F FF46S feeds FF10S which drives OE14S. OE14S connection could be improved to remove need for VLO signal.


Page 6 - Same as page 5 except for names. Note output to parametric gate tree. AAA is the switch group tag (matches IEVCC on page 1).


Page 7 - Next four bits.


Page 8 - Next four bits.


Page 9 - Next four bits. Note how the page number has been incorporated into the macro instance names - FF0905, FF0906, etc. - to prevent duplicate names.


Page 10 - Next four bits.


Page 11 - Next four bits.


Page 12 - Last four bits for 32-bit registers.


Page 13 - The parametric gate tree - all inputs fed into a combinatorial gate tree and tied to one output. PGATE is the GTO parameter value. OE42S should be changed. Note how page references make it possible to trace the connections.
(Figure A-8)


Page 14 - The second 16:1 MUX - this page should have been grouped with the other MUX page for better schematic set readability. Group functions together.
(Figure A-7)

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




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