[SI-LIST] Re: LVCMOS Trace length for 106MHz Clock
- From: "Mehta, Darshan" <darshan_mehta@xxxxxxxxxx>
- To: <pushpaj@xxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 18 May 2006 16:44:35 +0530
Hi Pushpa,
What is the Rise time/Fall time of the signal. There are multiple thumb
rules like 1/6, 1/9 rules to calculate the Critical length depending
upon the Rise time of the signal. The thumb rule says that=20
L > 20% Rise time of Signal / 6 ----This is 1/6
rule
The best way to choose the length is to simulate it in SI Pre-Layout
tools like HyperLynx or ICX Pro Explorer and see the effect. The thumb
rule may not give you the optimum results so better to use Pre-Layout SI
tools. Hope this will help you.
Thanks,
Darshan Mehta
Field Application Engineer, ICX and HyperLynx
Mentor Graphics, Bangalore India
Ph: +91(80)-3051-4041
fax: +91(80)-3051-4004
cell:+91(988)-015-6127
darshan_mehta@xxxxxxxxxx
www.mentor.com/hyperlynx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Pushpa Jain J - TLS, Chennai
Sent: Thursday, May 18, 2006 4:26 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] LVCMOS Trace length for 106MHz Clock
Hello All,
Is 106.25MHz clock form the LVCMOS buffer output can be routed up to 12
inches length and still meets the signal quality?.
Thanks and Regards
Pushpa
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