Re: [SI-LIST] : High Speed Backplane Connector Recommendations

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From: Jon Keeble (jkeeble@alpha.net.au)
Date: Fri Jan 14 2000 - 03:23:30 PST


By "daisy chain" I meant eliminating the stub by using two pins and looping
the trace through the pin of the transceiver.

Jon

-----Original Message-----
From: Bruce W. Marler <BMarler@WooshCom.com>
To: si-list@silab.eng.sun.com <si-list@silab.eng.sun.com>
Date: Friday, January 14, 2000 10:44 AM
Subject: Re: [SI-LIST] : High Speed Backplane Connector Recommendations

>Daisy chaining won't work because any board can drive the bus.
>Bruce
>----- Original Message -----
>From: Jon Keeble <jkeeble@alpha.net.au>
>To: <si-list@silab.eng.sun.com>
>Sent: Thursday, January 13, 2000 2:25 PM
>Subject: Re: [SI-LIST] : High Speed Backplane Connector Recommendations
>
>
>> How 'bout daisy chaining the high speed signals (are there only 8 + the
>> clock?) through the connector?
>>
>> This at least eliminates the stub and so maybe the cpci connectors could
>be
>> used.
>>
>> At the very least I'd suggest a modeling exercise is called for - AMP
>supply
>> spice models for their parts.
>>
>>
>> Good luck!
>>
>> Jon Keeble
>>
>> -----Original Message-----
>> From: Bruce W. Marler <BMarler@WooshCom.com>
>> To: si-list@silab.eng.sun.com <si-list@silab.eng.sun.com>
>> Date: Friday, January 14, 2000 4:57 AM
>> Subject: [SI-LIST] : High Speed Backplane Connector Recommendations
>>
>>
>> >I am designing a high speed digital backplane interconnect system and
was
>> >wondering if anyone had any recomendations about what manufacturer's
>> >connectors I should be looking at - either connector to connector
systems
>> or
>> >card edge connector systems.
>> >
>> >Our system is a multidrop system with up to 18 cards plugging into a
>> >backplane. The bus is an 8 wide synchronous LVDS bus with a clock.
Each
>> >data channel has a rate of 200Mbps, and the clock is 200 MHz. Density
is
>> >not that great 60 to 80 signals within 3.5" of edge space.
>> >
>> >Each card will have only one load on it's stub from the main bakplane
>bus,
>> >and that load will be mainly capacitive due to the receiver. I am
>looking
>> >for connectors that will minimize the distance from the backplane to the
>> >receiver chip. Controlled impedance on the connector is not that
>important
>> >because I am keeping the length so short. But I do like it when
>connectors
>> >have a separate grounding bus connection like the AMP MICTOR or their
>> >Micro-Strip connectors.
>> >
>> >I also like surface mount solutions like the AMP Mictor connector as it
>> >would enable me to route the backplane with minimal vias. However the
>AMP
>> >Mictor connector is extremely expensive and does not have different pin
>> >lengths for hot swapping.
>> >
>> >Does anyone have any recommendations on connnectors I should be
>evaluating?
>> >
>> >I have already looked at:
>> >AMP MICTOR - very nice small connector 0.4" from backplane to pin - very
>> >nice non-typical over-the-edge type connection for right angle
>connector -
>> >very expensive - this is my favourite so far, but it's price and lack of
>> >support for hot swapping are a problem.
>> >AMP Micro-Strip - a little larger than Mictor - 0.6 " - fairly
>> >expensive - nice but no support for hot swapping
>> >AMP 2mmHM - very long distance from backplane to pins - 1" for
farthest
>> >pin - supports hot swapping - higher density than what I need.
>> >Teradyne's connectors - very similar to AMPs 2mmHM
>> >
>> >Regards
>> >
>> >Bruce Marler
>> >WooshCom Corporation
>> >Denver, Colorado
>> >bmarler@wooshcom.com
>> >303-697-1577
>> >
>> >
>> >
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>
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