More thoughts on building a Z-80 (64bit!!!)

From: Allison J Parent <allisonp_at_world.std.com>
Date: Fri Oct 23 22:17:53 1998

< I have made double-sided boards that ran at 100MHz+. The trick was to us
< (a) one side entirely unetched as a ground plane, (b) design all the
< tracks as striplines, (c) know the characteristics of the PCB material,
< (d) use 100% SMD components with the shortest possible ground
< connections, (e) use carefully designed twisted pair lines to carry
< signals about if you couldn't route the tracks, (f) terminate everything
< properly and (g) take a lot of care and think about what you are doing.

(h) accept lower component density on the board to do that.

It's very doable but, a 4-6 layer makes it so much less painful for a
production system.

Allison
Received on Fri Oct 23 1998 - 22:17:53 BST