Memory Organization; Maximum And Minimum Dimm Bank Layouts - DEC Digital Alpha VME 4/224 User Manual

6.3.1 Memory Organization

A bank of memory is one width of DRAMs, 128 bits, implemented with DIMMs.
The DECchip 21071-CA supports one or two banks of DRAM where each bank
consists of two DIMMs of the same size and speed.
The 21071-CA supports 16 MB to 128 MB of main memory. The chip controls two
banks of DRAM DIMMs. Each bank contains two 80-bit DIMMs to support the
128-bit data path and longword error checking/correction (ECC). The DIMM sizes
are 1 MB x 80 (8 MB), 2 MB x 80 (16 MB), and 4 MB x 80 (32 MB). This provides
for 16, 32, 48, 64, 80, 96 or 128 MB of total system memory. Figure 6–5 shows
the maximum and minimum DIMM bank layouts.
Figure 6–5 Maximum and Minimum DIMM Bank Layouts
Maximum 128 MB DRAM Layout Populated with 4 MB x 80 DIMMS
Bank 1: DRAM 0 - 32 MB DIMM memdata 0 - 63 + ECC
Bank 0: DRAM 0 - 32 MB DIMM memdata 0 - 63 + ECC
Bank 1: DRAM 1 - 32 MB DIMM memdata 64 - 127 + ECC
Bank 0: DRAM 1 - 32 MB DIMM memdata 64 - 127 + ECC
Maximum 16 MB DRAM Layout Populated with 1 MB x 80 DIMMS
Bank 1: DRAM - Unpopulated
Bank 0: DRAM 0 - 8 MB DIMM memdata 0 - 63 + ECC
Bank 1: DRAM 1 - Unpopulated
Bank 0: DRAM 1 - 8 MB DIMM memdata 64 - 127 + ECC
6–6 Cache and Memory Subsystem
ML013277