[SI-LIST] Re: series resistor on SSTL-2
- From: "Peterson, James F (FL51)" <james.f.peterson@xxxxxxxxxxxxx>
- To: SI <si-list@xxxxxxxxxxxxx>
- Date: Tue, 27 Jul 2004 04:48:24 -0700
Jeremy -
i believe you're right, it is for signal integrity. one reason why it would
be placed near the SDRAM DIMM is if it's on a data line (bi-directional, so
it is close to a driver). if it is on the address bus, maybe it's using the
PCI method of isolating stubs as the signals go to several locations
(DIMMs).....
regards,
Jim Peterson
Honeywell
-----Original Message-----
From: Leong [mailto:llt@xxxxxxx]
Sent: Monday, July 26, 2004 5:47 PM
To: SI
Subject: [SI-LIST] series resistor on SSTL-2
Hi all
I am not sure why there is a in line resistor (Rs) on SSTL-2 design and this
in-line resistor was placed close to the DDR SDRAM DIMM.
I understand DDR protocol and still I cannot figure out the purpose of this
in-line resistor (Rs). Is that something have to do with signal integrity ?
If it is, why don't we place this resistor close to the driver side (North
bridge) ?
I am lost, can someone please do a brief explanation or send me a link so I
can read more on it.
Thanks in advance
Jeremy
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