[PCB_FORUM] Re: Very interesting router...
- From: <george.h.patrick@xxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Tue, 23 May 2006 15:58:48 -0700
Many folks run a fanout.do script to do the fanouts. It specifies
certain nets (i.e. power, gnd) and certain max lengths and runs a few
passes, lengthening for each pass. Then it runs fanouts for signals
with less constraints on it.
An example:
fanout 5 (direction out) (max_len 100) (pin_type power)\
(pin_share off) (via_share on) (share_len 100)
fanout 5 (direction out) (max_len 200) (pin_type power)\
(pin_share off) (via_share on) (share_len 200)
fanout 5 (direction in_out) (max_len 100) (pin_type power)\
(pin_share off) (via_share on) (share_len 100)
fanout 5 (direction in_out) (max_len 200) (pin_type signal) (pin_type
power)\
(pin_share off) (via_share on) (share_len 200)
You get the idea...
--
George Patrick
Tektronix, Inc.
Central Engineering, Engineering Design Services
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
* 503-627-5272 (voice) * 503-627-5587 (fax)
http://www.tektronix.com http://www.pcb-designer.com
"Off-Grid and Proud of it!"
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Gennadiy
Kiryukhin
Sent: Tuesday, May 23, 2006 13:50
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Very interesting router...
Why does router create unreasonably long and strangely twisted fanouts
for ground and power signals?
Thanks,
Gennadiy
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