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8.10 Media Lock/Media Unlock (DEh/DFh)
This command is effective an NOP command and always fails with the Drive returning command aborted.
Table 46 defines the Byte sequence of the commands.
Table 46: Media Lock/Media Unlock
Task File Register
7
6
5
4
3
2
1
0
COMMAND
DEh/DFh
DRIVE/HEAD
nu
nu
nu
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
nu
8.11 NOP (00h)
This command always fails with the Drive returning command aborted. Table 47 defines the Byte sequence
of the NOP command.
Table 47: NOP
Task File Register
7
6
5
4
3
2
1
0
COMMAND
00h
DRIVE/HEAD
nu
nu
nu
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
nu
8.12 Read Buffer (E4h)
The Read Buffer command enables the host to read the current contents of the Drive ’s sector buffer. This
command has the same protocol as the Read Sector(s) command. Table 48 defines the Read Buffer
command Byte sequence.
Table 48: Read buffer
Task File Register
7
6
5
4
3
2
1
0
COMMAND
E4h
DRIVE/HEAD
nu
nu
nu
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
nu
nu
nu
nu
nu
8.13 Read DMA (C8h)
This command uses DMA mode to read 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 the Drive sets BSY, puts all or part of the sector of data in the buffer. The
Drive is then permitted, although not required, to set DRQ, clear BSY. The Drive asserts DMAREQ while data is
available to be transferred. The Drive asserts DMAREQ while data is available to be transferred. The host
then reads the (512 * sector-count) bytes of data from the Drive using DMA. While DMAREQ is asserted by the
Drive, the Host asserts -DMACK while it is ready to transfer data by DMA and
asserts -IORD once for each 16 bit word to be transferred to the Host.
Interrupts are not generated on every sector, but upon completion of the transfer of the entire number of
sectors to be transferred or upon the occurrence of an unrecoverable error.
At command completion, the Command Block Registers contain the cylinder, head and sector number of the
last sector read. If an error occurs, the read terminates at the sector where the error occurred. The
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
P-120_data_sheet_PA-QxBO_Rev100.doc
Page 48 of 76
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