Path: news.rdc1.sfba.home.com!newshub1.home.com!news.home.com!news.rdc1.sfba.home.com.POSTED!not-for-mail Message-ID: Newsgroups: comp.sys.sun.hardware Subject: Re: Full Spec of "Darwin" memory References: <3625DD94.4862FD0B@atlan-tech.com> <706cig$2lr$1@mars.njcc.com> From: zaitcev@bogus.com (Pete Zaitcev) Lines: 25 Date: Sat, 17 Oct 1998 23:07:51 GMT Organization: @Home Network khansen@pluto.njcc.com (Ken Hansen) writes: >Stephen Holmes (sholmes@atlan-tech.com) wrote: >: Sun literature says that the memory for the Ultra 5 and 10 is >: 168 Pin 60nS EDO JEDEC DRAM with ECC Error Correction >: My memory catalogue says nothing about JEDEC, but offers various >: combinations of >: 3.3 or 5 Volt >: Buffered, Unbuffered or Synchronous. Take the existing DIMM so that connector is down and extra notch is on the left of the central notch. Notches may be offset a little from the center between contact rows. Offset means: Left notch (between 20 & 60 pin sections): to the left: RFU on center: Buffered to the right: Unbuffered Center notch (between 60 & 88 pin sections): to the left: 5.0V on center: 3.3V to the right: Reserved at the time --Pete From: zaitcev Subject: summary Aurora: 5.0V ECC Fast Page mode 60ns Sunfire: 3.3V ECC (not EDO probably, rather FP) Darwin: 3.3V ECC EDO Buffered 60ns Krups, Espresso, JE-1: 3.3V no ECC, no parity, EDO Unbuffered Thanks to Dirk Hufnagel , who points out URL: http://www.sun.com/desktop/products/Ultra10/u10technologies.html From technofiend@gnuplanet.com Wed Mar 14 01:17:52 2001 Path: news1.frmt1.sfba.home.com!newshub1.rdc1.sfba.home.com!a-newshub1.rdc1.sfba.home.com!newshub2.rdc1.sfba.home.com!news.home.com!pln-w!spln!dex!extra.newsguy.com!newsp.newsguy.com!drn From: technofiend@gnuplanet.com Newsgroups: comp.sys.sun.hardware Subject: Memory for the Sunblade 100 slightly decoded Date: 13 Mar 2001 18:24:12 -0800 Organization: Newsguy News Service [http://newsguy.com] Message-ID: <98mkoc02vc5@drn.newsguy.com> The exact Micron Part Number on my 128MB stick of memory is MT9LSDT1672A6-133B1. According to Micron's guide to their part numbers at http://images.micron.com/pdf/numbering/numsdrammod.pdf this means my machine has a MT -- Micron Technology 9 -- 9 Memory component L -- 3.3 Volt SDT -- SDRAM TSOP *See explanations below 16 -- 16 Deep 72 -- 72 Wide A -- 168 Pin unbuffered, serial presence-detect G -- Gold Plated DIMM 133 -- 133MHz B -- Revision B 1 -- PCB Board 1 Here then is a quick list of chips to order: 128MB MT9LSDT1672A6-133XX 256MB MT18LSDT3272AG-133XX 512MB MT18LSDT6472AG-133XX So from the top this means you have a part manufactured by Micron Technology, if it wasn't a Micron Chip, we couldn't use the rest of the numbers and letters to decode the chip's type and use. SDRAM Refers to Synchronous Dynamic Random Access Memory, which is just the kind of memory being used here (the other kind in modern use is Static Memory.) TSOP refers to how the chips on the memory stick are packaged and isn't really important to your or me. Based on this information, we know we have a 128MB unbuffered chip. Chips can be either registered or unbuffered, what is the difference? The difference is how the computer interfaces with the memory and where certain driver chips are located. Registered and unbuffered chips are notched differently and *cannot* be mixed. Make sure to buy unbuffered chips for your Sunblade. We know this is a 3.3 Volt chip, and not a 2.5 Volt chip, again mixing parts isn't a good idea; get a 3.3 Volt chip. 2.5 Volt chips have a 'V' where the 'L' is in our part number. We know that is chip has ECC because Micron's part guide says it does, and from a few other clues -- it has 9 memory components not 8, so that 9'th chip must be for the parity. We also know this is a CAS3 chip since the part number ends has -133 instead of -13E. What the heck does that mean? The quote below was shamelessly lifted from somewhere: CAS Latency (or just "latency") is the time it takes for the memory to output data after receiving a read command. Latency is measured in clock cycles and it's often noted as CAS2 or CL2 (for a latency of two clock cycles), or CAS3/CL3 (for a latency of three clock cycles). If you really want to know more about memory, read Kingston's Ultimate Memory Guide -- http://www.kingston.com/tools/umg/default.asp