[SI-LIST] Re: DDR-II
- From: Prakash N <npk_0@xxxxxxxxxxx>
- To: kalevi@xxxxxxxxxx
- Date: Wed, 30 Mar 2005 06:39:27 +0100 (BST)
Hi
When doing our interface design the problem is like this.
We are having seperate 16 bit data for read and write at the controller side
and 8 bit bidirectional data at the memory side. Our interface has some mux,
OCD , ODT etc. Actually we are not doing full controller design rather I/O part
of controller. So while simulating we are not giving address,RAS,CAS etc,. Only
we are having data bits, OE and control bits for OCD,ODT. Now if we want to
simulate the interface there are so many combinations we have to try, as
effectively 32 bit data (seperate 16 bit data for read and write) is connected
to 8-bit data. This simulation takes more time and laborius. Could anyone
suggest how to test effectively so that the time and complexity is reduced.
My second question is
should we have to put ODT (On-Die termination) on both transmitter and reciever
(both on controller) or it is enough to have ODT in reciever side, as there is
a OCD(off-chip driver) in transmitter side which can take care of termination.
Regards
Prakash
Kai Keskinen <kalevi@xxxxxxxxxx> wrote:
Simulating 8 bits plus associated clock, address, and strobe should take
about 1 hour to set up and 10 minutes to simulate with an IBIS simulator
like Allegro PCB SI or Mentor's Hyperlynx. What tool are you using? Even
with HSPICE, the set up will take a bit longer but you should be able to
simulate in no more than 1 hour (and probably a lot less) unless you have
very low level encrypted spice models.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Prakash N
Sent: Tuesday, March 29, 2005 10:32 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] DDR-II
Hi
I'm doing mini project in DDR-II interface between controller and DDR-II.
Anybody knows how to simulate, as trying to simulate 8 bits will take a
long time. So we have to simplify the simulation with good accuracy. If
anyone knows about simultaing , please help me.
Regards
Prakash
M.E.(Microelectronics Systems)
Centre for Electronics Design & Technology (CEDT)
Indian Institute of Science, Bangalore-560012
Karnataka-India
09448787632
Yahoo! India Matrimony: Find your life partneronline.
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