Re: How can I find out the input/output interface of SDR SDRAM Kingston KVR100X64C2/128?

On Sep 25, 6:48 pm, Wei Wang <camww...@xxxxxxxxx> wrote:
On Sep 25, 9:31 pm, Gabor <ga...@xxxxxxxxxxx> wrote:



On Sep 25, 2:12 pm, Weng Tianxiang <wtx...@xxxxxxxxx> wrote:

On Sep 25, 8:51 am, Wei Wang <camww...@xxxxxxxxx> wrote:

All I can find is a one-page specification of "Kingston
KVR100X64C2/128", but I do not know about the input and output
interface of this SDRAM, e.g., what are the input and output signals,
and how the input and output signals are wired into each Synchronous
DRAM (Infineon HYB39S128800CT-8) module. Many thanks, -Wei

Hi,
Go to Infineon or Micron, or Samsung to search for similar SDRAM
chips.

Kingston is not a chip manufacture, but a DIMM manufacture.

All SDRAM chips are almost same with Micron having the tighest
requirements.

You may print Micron 128800CT-8 SDRAM to see if there is a document
over there. Maybe they are all out of date.

Weng

A good source for DIMM data is JEDEC. On their website, jedec.org,
you
can find standard connections for all standard DIMM types. If you
know
the type of chip and number of chips on your module you can generally
narrow down the choices to one JEDEC standard.

Their website is a little hard to navigate, but the search feature
generally gets you to the information you need, and all of the
standards
include reference schematics so you can see the chip connections.

HTH,
Gabor- Hide quoted text -

- Show quoted text -

Thanks Tianxiang and Gabor for your inputs, but I was a little
confused with the description in Kingston KVR100X64C2/128 "The
components on this module
include sixteen 8M x 8-bit (2M x 8-bit x 4 Bank / PC100 components)
SDRAM in TSOP packages", but when I look at Infineon HYB39S128800CT-8,
the chip has four banks inside,
each bank is 8 bits wide with 4M address, so each chip is 4Mx8bitx4,
which is 16MB. As the Kingston is 128 MB big and it has 8 Infineon
chips fitted, so I don't see why the KVR specification says the module
contains sixteeen 8Mx8-bit SDRAM. Should it be 8 16Mx8-bit SDRAM, then
I could not find this in JEDEC standard while I could find the JEDEC
standard for sixteen 8Mx8bit? Could somebody give me some hints on
this, thanks!!!


The data *** also notes:

"Note: The module defined in this data *** is one of several
configurations available under this part number. While all
configurations are compatible, the DRAM combination and/or the
module height may vary from what is described here."

I'm not sure what they consider "compatible" in the case of modules
with different memory organizations under the same part number,
but I also noticed that they offer "Free Technical Support".

Perhaps someone at Kingston can address the issue?

Regards,
Gabor

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