Chris
If the stub capacitance at each load is negligible for 100 Mhz 1/(3 X 3ns) the series
string is ok. Also check the latency which may be a couple ns for 19 inches ~1ns/ft.
Be sure to terminate at the last load.
A star would be a lot of traces.
Ron Miller
Chris Bobek wrote:
> I have an address bus that is 75ohm, and 19" long. There are 8 loads that
> are daisy-chained along the trace. The edge from the driver (which is at
> one end) is 3ns.
>
> I was wondering if I would be better off with a star pattern, where each leg
> is short (less than 4"). Would this work and not require any termination?
>
> Thank you very much,
>
> Chris
>
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Ronald B. Miller _\\|//_ Signal Integrity Engineer
(408)487-8017 (' 0-0 ') fax(408)487-8017
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Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA 95131
[email protected], [email protected]
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Chris
If the stub capacitance at each load is negligible for 100 Mhz 1/(3
X 3ns) the series
string is ok. Also check the latency which may be a couple
ns for 19 inches ~1ns/ft.
Be sure to terminate at the last load.
A star would be a lot of traces.
Ron Miller
Chris Bobek wrote:
I have an address bus that is 75ohm, and 19" long.
There are 8 loads that
are daisy-chained along the trace. The edge from the driver (which
is at
one end) is 3ns.
I was wondering if I would be better off with a star pattern, where
each leg
is short (less than 4"). Would this work and not require any
termination?
Thank you very much,
Chris
**** To unsubscribe from si-list: send e-mail to [email protected].
In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list
****
--
Ronald B. Miller _\\|//_ Signal Integrity Engineer
(408)487-8017 (' 0-0 ') fax(408)487-8017
==========0000-(_)0000===========
Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA 95131
[email protected], [email protected]
--------------092A88BCBF1D529676337F5E--
**** To unsubscribe from si-list: send e-mail to [email protected]. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****