[SI-LIST] Re: RDRAM termination
- From: "Baranauskas, Dave" <Dave.Baranauskas@xxxxxxxxxxxx>
- To: <whizplayer@xxxxxxxxx>, <wudance@xxxxxxxxxxxx>,<si-list@xxxxxxxxxxxxx>
- Date: Thu, 28 Mar 2002 11:48:01 -0600
Dan,
To answer you question, Direct RDRAM IO is an open drain current source
(I believe this is the case for Base and Concurrent RDRAM as well).
This being the case the IO's current comes from the termination voltage
source and is routed through the terminators connected to the end of the
bus. If you do not put the termination resistors in circuit the IO can
not switch.
Dave
-----Original Message-----
From: Bob Patel [mailto:whizplayer@xxxxxxxxx]
Sent: Thursday, March 28, 2002 11:04 AM
To: wudance@xxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: RDRAM termination
Hi! My advice would be to talk to Rambus directly on
your case because Rambus does not release any models
of it I/O and hence an end user does not have any
knowledge about how to go about designing the board
except rely on them .
Bob
--- "Dance Wu (netscape.net)" <wudance@xxxxxxxxxxxx>
wrote:
>=20
> Hi,
>=20
> One of my projects requires RDRAM. I understand that
> termination is
> needed at the end of channel to eliminate/minimize
> reflection. My
> question is do I still need these termination
> resistors if there is only
> one RDRAM device ( not the module ) on the channel?
> I'm trying to save
> power and board space here. Your opinion and
> experience are greatly
> appreciated.
>=20
> Dan
>=20
>
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