Memory Addressing And Data Location; Contents Of Dimms - Compaq AlphaServer DS20 Service Manual

1.7

Memory Addressing and Data Location

Memory addressing is contiguous beginning with memory bank 0. The first
address of each bank is one above the ending address of the previous bank.
Data is located in DIMMs as described by Figure 1-7.
Figure 1-7 Contents of DIMMs
DIMM Slots
D D
Chip Chip
D
D
Chip
Chip
DIMM Slots
1-14 AlphaServer DS20 Service Manual
DIMM Contains
Bank 1 even bytes 0, 2, 4, 6, 8, 10, 12, 14
Bank 3 even bytes 0, 2, 4, 6, 8, 10, 12, 14
Bank 1 even bytes 16, 18, 20, 22, 24, 26, 28, 30
Bank 3 even bytes 16, 18, 20, 22, 24, 26, 28, 30
Bank 0 even bytes 0, 2, 4, 6, 8, 10, 12, 14
Bank 2 even bytes 0, 2, 4, 6, 8, 10, 12, 14
Bank 0 even bytes 16, 18, 20, 22, 24, 26, 28, 30
Bank 2 even bytes 16, 18, 20, 22, 24, 26, 28, 30
C
D
D
Chip
Chip
Chip
D
D
Chip
Chip
Bank 2 odd bytes 17, 19, 21, 23, 25, 27, 29, 31
Bank 0 odd bytes 17, 19, 21, 23, 25, 27, 29, 31
Bank 2 odd bytes 1, 3, 5, 7, 9, 11, 13, 15
Bank 0 odd bytes 1, 3, 5, 7, 9, 11, 13, 15
Bank 3 odd bytes 17, 19, 21, 23, 25, 27, 29, 31
Bank 1 odd bytes 17, 19, 21, 23, 25, 27, 29, 31
Bank 3 odd bytes 1, 3, 5, 7, 9, 11, 13, 15
Bank 1 odd bytes 1, 3, 5, 7, 9, 11, 13, 15
PK1488-98