Re: [SI-LIST] : Daisy-Chain

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From: Yu Wang (wangy_km@yahoo.com)
Date: Mon Mar 20 2000 - 07:00:57 PST


HI,KT.THAM
I don't think your connecting sequence is a daisy
chain. Usually, a daisy chain starts with a driver.
but, if becuause of the layout restriction, you may
split the trace from the driver to two, each has Zo/2.
and put a termination at the end of each splited
trace.

Yu Wang

--- Tham Kok Tong <kt_tham@uti2000.co.jp> wrote:
> Hi,
>
> I have a trace which connects in daisy-chain from 1
> driver(transceiver) to
> 6 receivers ( 2 ASICs (BGA type), 2 ROMs, 1 flash
> memory and 1 transceiver).
> The connecting sequence is 1) ASIC1, 2) ASIC2, 3),
> transceiver, 4) ROM1, 5)
> ROM2, 6) Flash memory.
> My problem is the simulation result shows reflection
> occurs at the
> receiver(non-monotonic waveform) nearest to the
> driver. Is it a good idea
> to put a pulldown resistor at that receiver(resistor
> value = Zo)?
>
> I welcome any suggestions or advices on this matter.
> Thank you.
>
> Regards,
> KT.THAM
>
>
>
>
>
>
_________________________________________________________
>
>   Ultimate Technologies Inc.
> SI Group
> KT.THAM
>
> 1462-6F, Shindencho, Nagano-Shi 380-0835,
> Japan
>   TEL:  026-267-7256
>   FAX: 026-267-7259
>
________________________________________________________

=====
Yu Wang, Ph.D
U.T. MD Anderson Cancer Center
1100 Holcombe Blvd., Box 217
Houston, TX, 77030
Tel:713-745-1671

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