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10.18 Read Sector(s) (20h or 21h)
This command reads from 1 to 256 sectors as specified in the Sector Count register. A sector count of 0 requests 256
sectors. The transfer begins at the sector specified in the Sector Number Register. When this command is issued
and after each sector of data (except the last one) has been read by the host, the Card sets BSY, puts the sector of
data in the buffer, sets DRQ, clears BSY, and generates an interrupt. The host then reads the 512 Bytes of data
from the buffer.
If an error occurs, the read terminates at the sector where the error occurred. The Command Block Registers
contain the cylinder, head, and sector number of the sector where the error occurred. The flawed data are
pending in the sector buffer. Table 74 defines the Read Sector command Byte sequence.
Table 74: Read sector(s)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
2 0h (or 21h Legacy)
DRIVE/HEAD
1
LBA
1
D
Head (LBA 27:24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
Cylinder High (LBA23:16)
Cylinder Low (LBA15:8)
Sector Number (LBA7:0)
Sector Count
nu
10.19 Read Sectors Ext (24h) 48bit LBA
This command reads from 1 to 65536 sectors as specified in the Sector Count Register. A sector count of 0 requests
65536 sectors. The transfer begins at the specified LBA. When this command is issued and after each sector of
data (except the last one) has been read by the host, the CompactFlash TM Storage Card sets BSY, puts the sector of
data in the buffer, sets DRQ, clears BSY, and generates an interrupt. The host then reads the 512 bytes of data
from the buffer.
At command completion, the Command Block Registers contain the LBA of the last sector read. If an error occurs,
the read terminates at the sector where the error occurred. The Command Block Registers contain the LBA of the
sector where the error occurred. The flawed data is pending in the sector buffer.
Table 75: Read Multiple Ext
register write
previous
current
Task File Register
15:8
7
6
5
4
3
2
1
0
COMMAND
-
24h
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
10.20 Read Verify Sector(s) (40h)
This command is identical to the Read Sectors command, except that DRQ is never set and no data is transferred
to the host. When the command is accepted, the Card sets BSY. When the requested sectors have been verified,
the Card clears BSY and generates an interrupt.
If an error occurs, the verify terminates at the sector where the error occurs. The Command Block Registers contain
the cylinder, head and sector number of the sector where the error occurred. The Sector Count Register contains
the number of sectors not yet verified.
Table 76 defines the Read Verify Sector command Byte sequence.
Table 76: Read Verify Sector(s)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
40h
DRIVE/HEAD
1
LBA
1
D
Head (LBA 27:24)
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
Cylinder High (LBA23:16)
Cylinder Low (LBA15:8)
Sector Number (LBA7:0)
Sector Count
nu
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-440_data_sheet_CF-HxBU_Rev100.doc
Page 74 of 102
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