SUMMARY: SIMM clock speed on SS1, SS2, SLC and IPC/IPX

From: bernards@ECN.NL
Date: Tue Dec 03 1991 - 06:21:55 CST

Thanx SunMGR's foor all info about memory SIMM's in Sun Sparcs.

It seemed that Sun is changing from standard 9Bits to 33/36 bit Simm's
Several warned me about IPX and SS2 tight memory timing specs:
These timing tolerances are:

        1) CAS precharge access time. tCP = 10ns

        2) access time from CAS precharge. tCPA is 45ns.

These timing tolerances do not conform to the standard DRAM offered
by most vendors. Most vendors CAS precharge access time is 12-15ns.
Therefor some 80ns SIMM's will work, some don't.
70ns SIMM's are reported to work OK, but Sun US Sales send out a warning that
they had found only 2 vendors who can offer good SIMM's.
Reported manifacturers are Hyundai and Mitsubishi.

IPX now uses the same type of SIMM found in the SLC .
It is either 4 MB or 16 MB - 36 bits - 80nsec.

So this is a general info for all SparcStations:

SLC - 4/16MB 33/36 bits - 80 Nsec
ELC - 4/16MB 33/36 bits - 80 Nsec
IPC - 1/4MB 9 bits - 80 Nsec
IPX - 4/16MB 33/36 bits - 70 Nsec
SS2 - 4MB 9 bits - 70 Nsec

Thanx all who replied:
 montagnia!sungy!svend.back (Svend Back - Sun Germany CSD - Munich)
 Kerien Fitzpatrick <> (Ray Bovet) (Emmanuel M. Paul)
 Jim Mattson <mattson@cs.UCSD.EDU> (Brian Keves - Consultant)
 Brian Kelley <dgsi!euler!>
 kpc!!cdr@uunet.UU.NET (Carl Rigney)
 Russell Ruby <russ@MATH.ORST.EDU>

Marcel Bernards, UNIX & Net sysadm Netherlands Energy Research Foundation ECN
(and SURFnet IC/ICP), Phone: (+31 /0)2246 4579 Fax: (+31 /0)2246 1864
E-Mail: Bernards@ECN.NL, SnailMail: P.O. Box 1, 1755 ZG Petten
SCREAMNet : AAAAAARGHH!HUH?? : Disclaimer: "The AntiChrist is the Computer !"

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