Filter
Top Products
5
Memory
Memory throughput is maximized by the following features:
• 128-bit wide memory data bus
• Very low memory latency (120 ns) and high bandwidth
with 12 ns clock
• ECC memory
The switch interconnect can move a large amount of data over
the memory data bus. The data bus is 128 bits wide (16 bytes).
With the memory bus speed of 77 MHz, the maximum
bandwidth is 1.3 GB/sec.
128 Data + 16 Check Bits
Data
Bus
Memory Bank 0 Memory Bank 1
Address Arrays 0 & 1
C-Chip
To Both D-Chips
PK0272A
Memory Options
Each memory option consists of two 200-pin industry-standard
DIMMs. The DIMMs are synchronous DRAMs. Memory
options are available in the following sizes:
• 256 Mbytes (128 MB DIMMs)
• 512 Mbytes (256 MB DIMMs)
• 1 Gbyte (512 MB DIMMs)
The system supports 2 Gbytes of memory.
Memory Configuration
• Systems come with one memory option (two DIMMs)
installed in Bank 0.
• Both DIMMs in a bank must be the same type and size.
• A second set of DIMMs can be added.
PK0331A-99
Bank 1
Bank 0
Memory Performance Considerations
With one memory option (2 DIMMs), memory operation
interleaving will not occur. With two memory options (4
DIMMs), memory read-write operations are two-way
interleaved. Interleaved operations reduce the average latency
and increase the memory throughput over noninterleaved
operations.