EW31244SL7QV Datasheet, PDF (76/252 Pages) Intel Corporation – Intel® 31244 PCI-X to Serial ATA Controller

Intel^® 31244 PCI-X to Serial ATA Controller
Programming Interface
5.3.2
Table 31.
LBA Addressing in DPA Mode
In DPA mode, the Sector Count, Sector Number, Cylinder Low, Cylinder High registers are 16-bit
wide. Therefore, the Sector Count and the LBA address bits may be written simultaneously.
28-Bit LBA Address Bit Layout in DPA Mode
LBA Bits
Register Bit Location
Register
7
6
5
4
3
2
1
0
Sector Number / LBA Low
7
6
5
4
3
2
1
0
Cylinder Low / LBA Mid
15
14
13
12
11
10
9
8
Cylinder High / LBA High
23
22
21
20
19
18
17
16
Device/Head
N/A
LBA
N/A
N/A
27
26
25
24
Table 32.
48-Bit LBA Address Bit Layout in DPA Mode
LBA Bits
Register Bit Location
Register
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Sector Number / LBA Low 31 30 29 28 27 26 25 24 7 6 5 4 3 2 1 0
Cylinder Low / LBA Mid 39 38 37 36 35 34 33 32 15 14 13 12 11 10 9 8
Cylinder High / LBA High 47 46 45 44 43 42 41 40 23 22 21 20 19 18 17 16
Device/Head
N/A LBA N/A N/A 1 1 1 1
76
April 2004
Developer’s Manual