On Fri, 26 Nov 2004, James Hunkins wrote:
> I would presume that he is using a couple of the layers for power and > ground, which will help a lot with the higher speeds and tend to keep > noise off the signals. Also, in manufacturing these days I believe in > higher quantities that 6 layers isn't much more (may actually be less > than) than 4 layers. This isn't as true as you might think, but for design rather than practical reasons. 6-layer boards are usually autorouted. 4-layer boards are more likely to be hand-routed and typically are better designed as a result. 6-layer boards are about 30% more expensive than 4-layer boards even in runs of 10,000. Dave _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
