Introduction
1-9
All memory modules for the
AlphaServer
GS60E have SIMMs (single inline
memory modules). DRAMs are mounted on small cards that are fixed to the
larger memory module by spring-held mounting clips that grip both sides of the
SIMM. Figure 1-4 shows:
➊
The array of SIMMS in an MS7CC–EA (1-Gbyte) memory module.
➋
Memory data interface (MDI) gate arrays that provide the data interface
between the TLSB bus and the DRAM arrays. The MDIs contain data
buffers, ECC checking logic, self-test data generation and checking logic,
and control and status registers (CSRs).
➌
The control address interface (CTL) gate array that provides the interface
to the TLSB, controls DRAM timing and refresh, runs memory self-test,
and contains TLSB and memory-specific registers.
➍
The DC-to-DC converter.
All types of SIMMs for all the memory modules available for
AlphaServer
GS60E systems are field-replaceable. Section 3.6 describes how to isolate a
problem SIMM. When you replace a SIMM, you must be sure that the type of
SIMM matches the module for which it is designed, as detailed in Table 1-1.
Table 1-1 Memory Modules and Related SIMMs
Memory (Size)
Motherboard
Part Number
SIMM Part Number
Number
of SIMMs
MS7CC–EA (1 GB)
EA2035-AA
54-21726-01 (32 MB)
32
MS7CC–FA (2 GB)
EA2036-AA
54-21718-01 (64 MB)
36
MS7CC–GA (4 GB)
EA2037-AA
54-24723-01 (128 MB)
36