Alpha 1000 Podręcznik Użytkownika Strona 102

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5.2.1 CPU Daughter Board
AlphaServer 1000A systems use a CPU daughter board. The daughter board
provides:
The DECchip 21064 or 21064A processor
2 megabytes of backup cache
APECS chipset, which provides logic for external access to the cache for main
memory control, and the PCI bus interface
SROM code (SROM tests are controlled by jumper J6 on the CPU daughter
board)
5.2.2 Memory Modules
AlphaServer 1000A systems can support from 16 megabytes to 1024 megabytes of
memory. Memory options consist of five single in-line memory modules (SIMMs)
and are available in the following variations:
16-megabyte (consisting of five 4-megabyte SIMMs)
32-megabyte (consisting of five 8-megabyte SIMMs)
64-megabyte (consisting of five 16-megabyte SIMMs)
128-megabyte (consisting of five 32-megabyte SIMMs)
256-megabyte (consisting of five 64-megabyte SIMMs)
The motherboard has 20 SIMM connectors. The SIMM connectors are grouped in
four memory banks (0, 1, 2, and 3) and one bank for ECC (Error Correction Code)
memory (Figure 5–4).
Memory Configuration Rules
Observe the following rules when configuring memory on AlphaServer 1000A
systems:
Bank 0 must contain a memory option (5 SIMMs–0, 1, 2, 3, and 1 ECC
SIMM).
A memory option consists of five SIMMs (0, 1, 2, 3 and 1 ECC SIMM for the
bank).
All SIMMs within a bank must be of the same capacity.
5–24 System Configuration and Setup
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