Hi again Xiangchen,

é wrote:
There is two voltages - 3.3V and 1.5V. Frequency is from 66MHz to 200MHz.

I would refer you to few good materials concerning the matter:

SI List and its archives: http://www.si-list.org

High-Speed Digital System Design - A Handbook of Interconnect Theory and
Design Practices. by Hall, Hall and McCall. 2000. ISBN 0-471-36090-2

High-Speed Digital Design - A Handbook of Black Magic. by Johnson and
Graham. 1993. ISBN 0-13-395724-1

I've heard about some supposedly good books released lately by SI list
members, that I have not yet got a chance to read. One of them was from
Lee Ritchey. Search SI List archives.

Only a few signals require impedance correspondence. I plan to use 0.1mm line width and 0.1mm clearance.

That can be adjusted for well-matched impedance in the PCB factory. At least if they are using LDI process.

Sorry. I donot know about IPC-SM-782A section 14.0. How to get it?

You can purchase it and other IPC standards from IPC: http://www.ipc.org/

Indrek

--
 Indrek Rebane           |      Borthwick-Pignon
 Electronics Engineer    |    Tartu Science Park
 Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu
 Fax:   (+372) 7 383 041 |               Estonia
 [EMAIL PROTECTED]        |         www.bps.co.ee



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