[SI-LIST] Re: IBIS Speed Support - DDR3
- From: shankar san <shankar.electronics@xxxxxxxxx>
- To: "Nikumbh, Raj" <Raj.Nikumbh@xxxxxxxxxxxxx>
- Date: Wed, 21 Jan 2015 12:42:16 +0530
Micron provides two different model for 1.35V and 1.5V for the DDR3 devices.
But for memory buffer, the vendor provides two files in the similar way one
for 1.35V and one for 1.5V.
The problem i am facing here is the datasheet says memory buffer can
support 1866 MTs @ 1.35V, but the provided IBIS file for 1.35V doesn't have
any speed related info (Description or comments in the IBIS file). Wherein
if you look at Micron DDR3 device IBIS file they will mention the supported
speed at the IBIS file description.
So how would i find that this model will work at 1866MTs at 1.35V without
any description in the IBIS file.
Thanks & Regards,
S Sankar
On Wed, Jan 21, 2015 at 11:14 AM, Nikumbh, Raj <Raj.Nikumbh@xxxxxxxxxxxxx>
wrote:
> Normally there are two different IBIS files for 1.5 and 1.35.
>
> Micron has v89c_it.ibs to 1.5V and v89c_1p35_it.ibs for 1.35V for one of
> its memories. As you have not mentioned the exact part you will have to get
> in touch with your memory vendor.
>
> ~Raj
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of shankar san
> Sent: Wednesday, January 21, 2015 10:27 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] IBIS Speed Support - DDR3
>
> Hi Experts,
> In DDR3 IBIS File, few vendors provide the supported speed with voltage.
>
> For Example: 1066/1333/1600/1866 @ 1.5V and 1066/1333/1600 @ 1.35V
>
> I have an IBIS file from an vendor in which datasheet says it supports
> 1866 @ 1.35V, but IBIS doesn't support 1866 @ 1.35, it supports only 1866 @
> 1.5V (These info's are commented in the IBIS file).
>
> Could some one clarify me how can we find the speed and voltage
> supportability of an IBIS file (If commented sections are not available).
>
> I am also following up with vendor for this, meanwhile any
> thought/suggestions would be of great help.
>
> Thanks in advance.
>
> Regards,
> S Sankar
>
>
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--
Regards,
S Shankar
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