Appendix C Functional Description C-13
C.1.6.1 DIMM
The DIMM is a 60-nanosecond, fast-page-mode-style DIMM. Four DIMM
configurations are supported in the system unit: 16-Mbyte, 32-Mbyte, 64-Mbyte,
and 128-Mbyte. The minimum memory capacity is 64 Mbytes (four 16-Mbyte
DIMMs). The maximum memory capacity is 2 Gbytes (sixteen 128-Mbyte DIMMs).
A block of data (64 bytes) always comes from one bank of DIMMs. An error code
containing the address of where a failure occurred,as well as the associated
syndrome, is logged when an ECC error occurs.
There are a total of four DIMM banks in the system unit. TABLEC-2 matches DIMM
banks to U numbers and TABLEC-3 list physical address maps to DIMM banks. The
DIMM bank numbering scheme is illustrated in FIGUREC-5.
TABLEC-2 DIMM Bank-to-U-Number Mapping
DIMMBank UNumber
0U0701 thru U0704
1U0801 thru U0804
2U0901 thru U0904
3U1001 thru U1004