[SI-LIST] Re: DDR2 ODT configuration

  • From: <hermann.ruckerbauer@xxxxxxxxxxxx>
  • To: <mazhuofan@xxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 17 Aug 2005 12:21:01 +0200

HI Ma,

Infineon had a JEDEC showing regarding a 4 slot DDR2 system and ODT
configuration.
Do you have access to  JEDEC documents ?
You might search for DDR2 4 slot documents. If you can find nothing I
can provide more details.

Regards

hermann =20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Zhuofan Ma
Sent: Saturday, August 13, 2005 8:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] DDR2 ODT configuration

Hi all,
=20
    Recently,I was doing a SI simulation on 400MTS DDR2 signals,with 4
DIMM slots. I notice that memory chip vendors introduce one and two DDR2
module ODT configuration scheme. When two module populated, the ODT will
be turned off at active module and turned on at standby module.
But if the active module is at far side to the memory controller, should
the ODT at close standby module also be turned on? As to 4 DIMM slots,
if one module at different position is activated, how should other three
modules ODT be configured? In my opinion, only the farthest module ODT
should be turned on. Is that correct? Could anyone give me some
recommendation for how memory controller configure the standby modules
ODT? Btw, I've tried some different ODT schemes, but I wonder why the
simulation results are pretty similar?
   Thanks in advance for any advice or help.
=20
Sincerely,
Ma

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 =20
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