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Table 32: Read Multiple Ext
register write
previous
current
Task File Register
15:8
7
6
5
4
3
2
1
0
COMMAND
-
29h
DRIVE/HEAD
-
1
1
1
Drive
Reserved
LBA High
LBA Mid
LBA Low
SECTOR COUNT
FEATURES
LBA (47:40)
LBA (39:32)
LBA (31:24)
15:8
nu
LBA (23:16)
LBA (15:8)
LBA (7:0)
7:0
nu
Note: This specification requires that CompactFlash TM Cards support a multiple block count of 1 and permits larger
values to be supported.
6.18 Read Native max address (F8h)
The Read Native max address command reads the max native address of the drive. It is related to the Host
protected Area feature set. Table 33 defines the Read max native address command Byte sequence.
Table 33: Read native max address
Task File Register
7
6
5
4
3
2
1
0
COMMAND
F8h
DRIVE/HEAD
nu
LBA
nu
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
nu
The LBA bit shall be set to one to specify the address is an LBA. DEV shall specify the selected device.
The native drive size is given in Drive/Head, Cyl Hi, Cyl Low and Sector num register as LBA value.
6.19 Read Native max address Ext (27h)
The Read Native max address Ext command reads the max native address of the drive. It is related to the Host
protected Area feature set and 48-bit address feature set. Table 34 defines the Read max native address
command Byte sequence.
Table 34: Read native max address
Task File Register
7
6
5
4
3
2
1
0
COMMAND
27h
DRIVE/HEAD
nu
LBA
nu
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
nu
The LBA bit shall be set to one to specify the address is an LBA. DEV shall specify the selected device.
The native drive size is given in 16bit LBA High, Mid and Low register as 48bit LBA value.
To read out the higher and lower byte of the 16bit registers bit7 of the Device Control Register (HOB=High Order
Bit, write to Alternate status register) must be set to 1 or 0, respectively.
Table 35: Readout native max address Ext in 48bit mode
register read
HOB=1
HOB=0
Task File Register
STATUS
15:8
as HOB=0
7
BSY
6
DRDR
5
DF
4
nu
3
DRQ
2
nu
1
nu
0
ERR
DRIVE/HEAD
as HOB=0
1
1
1
Drive
Reserved
LBA High
LBA Mid
LBA Low
SECTOR COUNT
FEATURES
LBA (47:40)
LBA (39:32)
LBA (31:24)
nu
nu
LBA (23:16)
LBA (15:8)
LBA (7:0)
nu
nu
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 0.92
CH-9552 Bronschhofen
Switzerland
F-240_data_sheet_CA-HxBV_Rev092.doc
Page 29 of 56
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