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'[EE] PC100 query, was piclist.com archive is bett'
2005\05\26@045612 by Alan B. Pearce

face picon face
>how many pins are the dims, how many slots are free/what ram
>is in there at the moment?

Well he said PC100, so I would take it that defines the pin arrangement.

Which brings me to a point - does anyone know how the information in the
eeprom on these modules is arranged? I have two identical 64MB modules which
I would like to combine into a 128MB by moving the chips from one to the
second side of the other. Haven't tried it yet, but figure that just moving
the chips won't be enough.

2005\05\26@051640 by Jake Anderson

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face
i believe the eprom is for telling the host system the timing specifics
not the quantity of ram

the bios / OS detects that itself somehow

this of course could all be completley wrong

> {Original Message removed}

2005\05\26@075225 by Mike Harrison

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face
On Thu, 26 May 2005 09:56:08 +0100, you wrote:

>>how many pins are the dims, how many slots are free/what ram
>>is in there at the moment?
>
>Well he said PC100, so I would take it that defines the pin arrangement.
>
>Which brings me to a point - does anyone know how the information in the
>eeprom on these modules is arranged? I have two identical 64MB modules which
>I would like to combine into a 128MB by moving the chips from one to the
>second side of the other. Haven't tried it yet, but figure that just moving
>the chips won't be enough.

The content of the eeprom specifies everything about the module - size, bank format, timings etc.
I think it's a JEDEC standard.
There is some info on the Micron website - have a look at the datasheets of their SIMMs
You would probably need to tweak the eeprom data if moving chips between SIMMs
It's a standard I2C EEPROM - the addresses are set by the slot number so the ssytem can see what is
in each physical slot.



2005\05\26@100301 by Alan B. Pearce

face picon face
>The content of the eeprom specifies everything about the
>module - size, bank format, timings etc.

Yeah, that is what I understood too.

>I think it's a JEDEC standard.
>There is some info on the Micron website - have a look
>at the datasheets of their SIMMs

OK, that is a good pointer, thanks for that.

>You would probably need to tweak the eeprom data if moving
>chips between SIMMs

Well I figured I should only need to tweak the module size, as they are
identical units from the same manufacturer.

>It's a standard I2C EEPROM - the addresses are set by the slot
>number so the ssytem can see what is in each physical slot.

and these particular ones are Microchip ones. I assume they are on the SMB
bus that also talks to the ATX power supplies.

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