Sun Microsystems Ultra 5, Service Manual

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C-12 Sun Ultra 5 Service Manual • February 2000
C.1.3.1 DIMM Memory Configuration
Caution –
If the system memory is configured with 16-Mbyte DIMMs, and the
system memory is being upgraded with anything other than 16-Mbyte DIMMs, you
must remove all 16-Mbyte DIMMs and replace them with the memory upgrade.
An additional mode in the MCU supports 11-bit column addressing. Since the total
available address bits in the MCU is constant (1-Gbyte maximum addressable), the
maximum number of DIMM pairs in this mode is halved in 11-bit column address
mode (4 DIMMs). The MCU can only be programmed in 11-bit column address or
10-bit column address mode (16-Mbyte DIMM memory size), therefore the two types
of DIMMs cannot be mixed. If 16-Mbyte DIMMS (10-bit column address) are
installed and you wish to upgrade with 11-bit column address DIMMs, then the
10-bit DIMMs must be removed and replaced with 11-bit column address DIMMs.
The following table lists memory DIMM configurations.
C.1.3.2 DIMM Characteristics
The DIMMs used in the system have the following characteristics:
■
JEDEC standard 168-pin DIMM
■
Support ECC (x72)
■
Single 3.3-VDC +/- 0.3-VDC power supply
■
LVTTL-compatible input and outputs
■
All inputs are buffered with exception of RAS_L
■
CAS_L before RAS_L refresh capability
TABLE C-2
Memory DIMM Configuration
Sun Part
Number DIMM
Configuration
Number of
DRAMs
on Module
DIMM Memory
Size Bank Memory
Size (2 DIMMs)
Fully Loaded
(2 banks, 4
DIMMs)
Column
Address Bits
370-3211 2-Mbyte x 72 9 16-Mbyte
*
*. Do not mix with other DIMM memory size. Do not mix DIMMs that have 10 column address bits with DIMMs that have 11 column
address bits.
32-Mbyte 64-Mbyte 10*
370-3198 4-Mbyte x 72 18 32-Mbyte 64-Mbyte 128-Mbyte 11
370-3199 8-Mbyte x 72 9 64-Mbyte 128-Mbyte 256-Mbyte 11
370-3200 16-Mbyte x 72 18 128-Mbyte 256-Mbyte 512-Mbyte 11
370-3201 32-Mbyte x 72 36 256-Mbyte 512-Mbyte 1 Gbyte 11