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What is 32X4 and 64X4 memory?

Author
12 Mar 2005 9:04 PM
geezer
Can someone explain to me what these two terms really mean?  Maybe in
laymen's terms?  For example - if 32X4, what does the 32 represent and
what does the 4 represent?

Thanks

Author
12 Mar 2005 10:31 PM
William W. Plummer
geezer wrote:
> Can someone explain to me what these two terms really mean?  Maybe in
> laymen's terms?  For example - if 32X4, what does the 32 represent and
> what does the 4 represent?

32,768 nibbles, each 4-bits wide = 128K bits
Author
12 Mar 2005 10:37 PM
geezer
On Sat, 12 Mar 2005 17:31:57 -0500, "William W. Plummer"
<William.Plum***@alum.mit.edu> wrote:

>
>32,768 nibbles, each 4-bits wide = 128K bits

Then how come those numbers don't always work?  For example -

http://www.memorysuppliers.com/25pc7ns168pi2.html

has:

256MB PC100 7NS 168PIN 32x4 SDRAM

Explain please
Author
12 Mar 2005 10:56 PM
Pen
It has to do with the depth(32Mb) vs. width(4)equals
128 Megabits for the memory IC in question. Take a look at
this Micron page for 128Mb memory.
http://www.micron.com/products/dram/ddrsdram/partlist.aspx?density=128Mb
Note it is available in 3 different configurations. Likewise
the 256, 512,1Gb ones.


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"geezer" <w**@willy.com> wrote in message
news:rlr631dj25sd5et13eqgqg5l9vg46fvcgp@4ax.com...
> On Sat, 12 Mar 2005 17:31:57 -0500, "William W. Plummer"
> <William.Plum***@alum.mit.edu> wrote:
>
>>
>>32,768 nibbles, each 4-bits wide = 128K bits
>
> Then how come those numbers don't always work?  For example -
>
> http://www.memorysuppliers.com/25pc7ns168pi2.html
>
> has:
>
> 256MB PC100 7NS 168PIN 32x4 SDRAM
>
> Explain please
>
>
Author
12 Mar 2005 11:07 PM
Bob Day
Show quote Hide quote
"geezer" <w**@willy.com> wrote in message news:rlr631dj25sd5et13eqgqg5l9vg46fvcgp@4ax.com...
> On Sat, 12 Mar 2005 17:31:57 -0500, "William W. Plummer"
> <William.Plum***@alum.mit.edu> wrote:
>
> >
> >32,768 nibbles, each 4-bits wide = 128K bits
>
> Then how come those numbers don't always work?  For example -
>
> http://www.memorysuppliers.com/25pc7ns168pi2.html
>
> has:
>
> 256MB PC100 7NS 168PIN 32x4 SDRAM
>
> Explain please

Sounds like it's a double sided single bank dimm.

-- Bob Day
http://bobday.vze.com