[SunHELP] Another possibly unanswerable question about AXI memory (fwd)

[Robert Novak]

I thought I'd pass this question (see below) over to the crew on Sunhelp,
since it's more appropriate here than on rescue, and there were no answers
yet over there. Mild apologies to anyone inconvenienced by the
duplication.

Anyone here have an inspiration on the matter? :)

--Rob

Robert Novak, Indyramp Consulting * rnovak at indyramp.com * indyramp.com/~rnovak
        "And it's been a long December and there's reason to believe
           Maybe this year will be better than the last...." -- counting crows

---------- Forwarded message ----------
Date: Wed, 5 Sep 2001 18:33:56 -0700 (PDT)
From: Robert Novak <rnovak at indyramp.com>
To: rescue list <rescue at sunhelp.org>
Subject: Another possibly unanswerable question about AXI memory

Hi all,

I have an interesting issue with some memory in my AXi machine, thought
maybe someone could shed some light on it. 

I have two pieces of HB56SW3272ESK-5 "256MB Buffered EDO DRAM DIMM
32-Mword 72-bit, 4k Refresh, 2 Bank Module" dimms here. In a Micronics
W6Li board, they show up as 256MB sticks, but in my Ultra AXi board they
show up as 128MB sticks. I checked the bank layout and my configuration
matched the AXi manual's admonitions...

	SPARCengine(tm)Ultra(tm) AXi (UltraSPARC-IIi 360MHz)
	socket U0404 has a 256MB DIMM
	socket U0403 has a 256MB DIMM
	socket U0304 has a 128MB DIMM
	socket U0303 has a 128MB DIMM
	empty sockets: U0402 U0401 U0302 U0301
	total memory = 768MB

I'm wondering if I managed to end up with 10-bit column address 256MB
dimms here--somehow I thought they were all 11-bit at this size. The
datasheet I found at the url below suggests they're actually 12-bit
(A0-A11).

They were inexpensive enough that they're still cheaper than most of my
sources for 128MB sticks, but if there's a trick or a specification I'm
missing, I'd welcome the enlightment. 

And if anyone would like a pointer to my source just drop me a note (I
don't want to publish their email on a web-searchable forum, but I'll pass
it along in private email).

Thanks,
Rob


http://www.deetc.isel.ipl.pt/ftp/FicheirosSeccoes/Microprocessadores/mp2/Manuais/DRAMs/mm888%20EDO%20DIMM%20256MB.pdf

Robert Novak, Indyramp Consulting * rnovak at indyramp.com * indyramp.com/~rnovak
        "And it's been a long December and there's reason to believe
           Maybe this year will be better than the last...." -- counting crows

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