Alpha 1000 Uživatelská příručka stáhnout pdf (Strana 87)

5.2.1 CPU Daughter Board

AlphaServer 1000 systems use a CPU daughter board. The daughter board

provides:

• The DECchip 21064 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 1000 systems can support from 16 megabytes to 512 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)

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 1000

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.

Table 5–5 provides the memory requirements and recommendations for each

operating system.

System Conﬁguration and Setup 5–19

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Alpha 1000 Uživatelská příručka Strana 87