[SI-LIST] Re: Clock Distribution
- From: Dagmara Avanindra <dagmara.avanindra@xxxxxxxxx>
- To: lgreen22@xxxxxxxxxxxxxx
- Date: Thu, 11 Aug 2005 16:22:25 -0700
Sunjay,=20
does your clock source, that you need to distribute, have 1 output or
5 outputs?
Dagmara
On 8/11/05, Lynne D. Green <lgreen22@xxxxxxxxxxxxxx> wrote:
> Hello, Sanjay,
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> The answer depends on how tightly you need to control the skew.
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> High skew option: Route the 5 traces with equal delay without checking
> crosstalk. Check delay with a calculator or (better) a simulator.
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> Low skew option: Equal length and equal numbers of vias to get better
> matched delay for the 5 traces. Wide spacing to any adjacent traces, to
> reduce (often large) effects from crosstalk. Note that serpentines have
> faster delay if the legs are closely spaced, so any serpentines will take
> more area. Simulate to check min and max delay with worst-case crosstalk
> (all aggressors, not just the nearest ones!).
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> Really low skew option: Use optical distribution (flat optical "trace"
> designed to route signals on boards, together with optical drivers and
> receivers). The 5 delays can be very closely matched and will not have
> crosstalk effects. Check recent exhibitors at Wescon and DesignCon for
> vendors, or use Google. Be prepared to spend $$.
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> Best regards,
> Lynne
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> "IBIS training when you need it, where you need it."
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> Dr. Lynne Green
> Green Streak Programs
> http://www.greenstreakprograms.com
> 425-788-0412
> lgreen22@xxxxxxxxxxxxxx
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> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
> Behalf Of SanjayKumar Vasamreddy
> Sent: Wednesday, August 10, 2005 10:38 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Clock Distribution
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> Classification: UNCLASSIFIED
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> Hi All,
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> I have a clock source and I need to distribute to 5 destination points wi=
th
> same delay. Where can I place the 5 points and in what way source
> could be connected to 5 IC's matching length/delay.
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> This could be helpful for my project if any one suggest me the way to do.
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> Thanks In Advance
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> Sanjay
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