Freescale Semiconductor MPC5200B ユーザーズマニュアル
ATA Register Interface
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
11-17
11.3.3.10
ATA Drive Device/Head Register—MBAR + 0x3A78
11.3.3.11
ATA Drive Device Command Register—MBAR + 0x3A7C
Table 11-28. ATA Drive Device/Head Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Rsvd
Data
Rsvd
DEV
Data
Reserved
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 lsb
R
Reserved
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
Name
Description
0
—
Reserved
1
Data
Bit is command dependent. In LBA addressing mode, this bit is set to 1 to indicate LBA
addressing is chosen for data transfer.
addressing is chosen for data transfer.
2
—
Reserved
3
—
Reserved
4:7
Data
Bit content is command dependent. For most commands, this register indicates the data
transfer starting sector number for when CHS addressing is enabled. This register indicates
part of the LBA address when the LBA addressing is enabled.
transfer starting sector number for when CHS addressing is enabled. This register indicates
part of the LBA address when the LBA addressing is enabled.
This register is written only when ATA drive status register bits BSY and DRQ equal 0 and
DMACK is not asserted. If this register is written when BSY and DRQ bits are set to 1, the
result is indeterminate.
DMACK is not asserted. If this register is written when BSY and DRQ bits are set to 1, the
result is indeterminate.
Register content is not valid when drive is in sleep mode.
8:31
—
Reserved
Table 11-29. ATA Drive Device Command Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Rsvd
HUT
FR
FE
IE
UDMA
READ
WRITE
W
Data
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 lsb
R
Reserved
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0