[SI-LIST] Re: DDRII write problem!!
- From: TinaWu <tinawu@xxxxxxxxxxx>
- To: Chandrashekhar Kalyanaraman <ckalyan@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 19 Aug 2009 11:34:53 +0800
Dear KC,
Yes, it is 1.8V DDRII and we have the VTT.
The core voltage is 1.0V. When I simulated it,
the logic 1 is 1V , logic 0 is 0V and there is
a strange state 0.5V(...??). I don't know what it is??
Thanks for your reply!!
BRs,
Tina
----- Original Message -----
From: "Chandrashekhar Kalyanaraman" <ckalyan@xxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, August 19, 2009 11:17 AM
Subject: [SI-LIST] Re: DDRII write problem!!
> Hi Tina,
> Is this 1.8V DDR-II? Do you have a VTT (termination voltage)?
>
> If there is a VTT, the DQ line will sit at the VTT voltage whenever it is
> idle. My guess is that is what you are seeing, but 0.5V doesn't make sense
> for DDR-II.
>
> Regards
> KC
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of TinaWu
> Sent: Tuesday, August 18, 2009 7:38 PM
> To: si-list@xxxxxxxxxxxxx
> Cc: 吳亭瑩
> Subject: [SI-LIST] DDRII write problem!!
>
> Dear Sir,
> I simulated the DDR write and the waveform is bad.
> Here, I found the input(DQ) of DDR chip.
> There are 3 states - logic 0 (0V)¡Blogic 1 (1V) and
> the other state 0.5V. Is the phenomena right??
> Thanks in advance!!
> BRs,
> Tina
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