System Configurability
The memory system addresses a wide range of performance and cost design centers. J Class workstations
nominally support a 1024 MB (max) memory configuration (using 16 Mbit DRAM). It consists of the
master memory controller, four multibank DRAM controllers, one data MUX (implemented with four
data MUXes), and between two and 16 SIMMs. It interleaves up to 16 banks of memory on two
independent DRAM Data busses, and is limited to 768 MB/second (960 MB/second with EDO DRAM).
This configuration is primarily intended for use in higher performance applications requiring large
amounts of memory bandwidth.
Typical Configurations and SIMM Sizes
Memory is expanded in increments of SIMM pairs. Each SIMM pair forms two independent memory
banks. Depending on the DRAM technology, the SIMM capacity varies significantly. These are two
currently supported SIMM types used in all of the system configurations:
16 MB – 1M x 4 DRAM (4Mbit)
64 MB – 4M x 4 DRAM (16Mbit)
Performance and Interleaving Memory SIMMs
Note:
Interleaving is only performed across SIMMs of the same size. To get the best memory
performance, load SIMMs of all the same size.
When SIMMs of different sizes are installed in a system, use the following guidelines:
1.
Load SIMM pairs of the same size starting from SIMM pair 1 to SIMM pair x, starting with the
larger size SIMMs first.
2.
Load the next pair of SIMMs (of a different size) into SIMM pair x+1. This results in both size
SIMMs being evenly distributed over both DRAM busses for maximum memory bandwidth.
Note:
If the total number of SIMM pairs for different size SIMMs is not the same, you may
see memory performance degradation for a given application from one run to the next if the application
uses memory with less banks than the previous run.
Any combination of memory may be used, although for maximum performance, we recommend using
common–sized memory boards; either all 32 MB or 128 MB board pairs. To achieve both maximum
performance and maximum future capacity, use 128 MB board pairs exclusively.
Figure 3–3 shows the loading order.
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