298020-002 Datasheet, PDF (133/166 Pages) Intel Corporation – Intel 840 Chipset 82840 Memory Controller Hub (MCH)

82840 MCH
R
Figure 7 shows the interconnections between MCH and its dual Direct RDRAM channels configured at
multiple channel-pair mode.
Figure 7. Multiple Channel-pair Mode
Up to 32 RDRAM
Devices
MRH-R
82840
MCH
Rambus Expansion
Channel A
MRH-R
Terminator
Rambus Expansion
Channel B
Terminator
multi_pr-ch
The maximum system memory supported by MCH depends on the Direct RDRAM device technology
(Table 14).
Table 14. Maximum Memory Supported For Various Configurations
RDRAM
Directly Supported
Supported via MRH-R(s)
Increments
Maximum
Increments
Maximum
64Mb
128Mb
256Mb
16 MB
32 MB
6 4MB
512 MB
1 GB
2 GB
16 MB
32 MB
64 MB
1 GB
2 GB
4 GB
The row, column, and bank address bits required for the Direct RDRAM device depends on the number
of banks and page size of device. Table 15 shows the different combinations supported by the MCH.
Datasheet
133