EW31244SL7QV Datasheet, PDF (61/252 Pages) Intel Corporation – Intel® 31244 PCI-X to Serial ATA Controller

Intel^® 31244 PCI-X to Serial ATA Controller
Functional Blocks
Table 24.
Table 24 and Table 25 provide the data transfer rate on the PCI-X bus, for a various number of
ports, for read and write respectively. The transfer rates are based on 512-byte packets. Refer to
Table 22 and Table 23 for PCI-X bandwidth numbers. Table 24 and Table 25 also show two 31244
controllers operating together, thus providing a total of eight ports. The numbers in Table 24 and
Table 25 assume large sequential access across multiple drives.
Read Transfer Rate on PCI-X Bus
Table 25.
Number
Transfer Rate (MB/Sec)
of Ports
PCI-X
Speed (MHz)
1
2
3
4
5
6
7
8
66
140
280
420
435
435
435
435
435
100
140
280
420
560
680
680
680
680
133
140
280
420
560
700
840
904
904
NOTE: The SATA transfer rate is 140MB/s, instead of 150MB/s in order to account for bus protocol overhead.
Write Transfer Rate on PCI-X Bus
Number
Transfer Rate (MB/Sec)
of Ports
PCI-X
Speed (MHz)
1
2
3
4
5
6
7
8
66
140
280
420
496
496
496
496
496
100
140
280
420
560
700
752
752
752
133
140
280
420
560
700
840
1000
1000
NOTE: The SATA transfer rate is 140MB/s, instead of 150MB/s in order to account for bus protocol overhead.
Developer’s Manual
April 2004
61