Chapter 3 Processor/Memory Subsystem
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October 1997
3-6
3.2.2 SYSTEM MEMORY
The system board contains three 168-pin DIMM sockets for system memory. This system is
designed for using SDRAM DIMMs. As shipped from the factory the standard configuration may
be 32 or 64 megabytes installed. The addition of 8-, 16-, or 32-, 64-, or 128-MB DIMMs allows
the expansion of system memory up to a maximum of 384 megabytes. Single or double-sided
DIMMs may be used. Parity is not implemented in this system.
The system memory uses the following RAS line assignments:
RAS#0 DIMM 1, Bank A
RAS#1 DIMM 1, Bank B
RAS#2 DIMM 2, Bank A
RAS#3 DIMM 2, Bank B
RAS#4 DIMM 3, Bank A
RAS#5 DIMM 3, Bank B
The performance times of the SDRAM is listed as follows:
Table 3–4.
SDRAM Performance Times
Table 3-4.
SDRAM Performance Times
Parameter CAS Latency = 3 CLKs CAS Latency = 2 CLKs
Burst Read Page Hit: 9-1-1-1
10-1-1-1
8-1-1-1
9-1-1-1
Read Row Miss 10-1-1-1 10-1-1-1
Read Page Miss 13-1-1-1 10-1-1-1
Bk-to-Bk Burst Reads
(Pg Hit )
9-1-1-1, 1-1-1-1 (SLD=0, SSRE = 1)
10-1-1-1, 1-1-1-1 (SLD=0, SSRE = 1)
8-1-1-1, 2-1-1-1 (SLD=0, SSRE=1)
9-1-1-1, 2-1-1-1 (SLD=0, SSRE=1)
Write Page Hit 3 3
Write Row Miss 6 6
Write Page Miss 9 9
Posted Write 3-1-1-1 3-1-1-1
Write Retire Rate from
Posted Write Buffer
-1-1-1 -1-1-1
SLD = Speculative Lead Disable SSRE = SDRAM Speculative Read Enable
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