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6.9 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 25 defines the Read Buffer command
Byte sequence.
Table 25: 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
6.10 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 Command Block
Registers contain the cylinder, head, and sector number of the sector where the error occurred. The amount of
data transferred is indeterminate.
Table 26: Read DMA
Task File Register
7
6
5
4
3
2
1
0
COMMAND
C8h
DRIVE/HEAD
LBA
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
6.11 Read Multiple (C4h)
The Read Multiple command performs similarly to the Read Sectors command. Interrupts are not generated on
every sector, but on the transfer of a block which contains the number of sectors defined by a Set Multiple
command.
Command execution is identical to the Read Sectors operation except that the number of sectors defined by a
Set Multiple command is transferred without intervening interrupts. DRQ qualification of the transfer is required
only at the start of the data block, not on each sector.
The block count of sectors to be transferred without intervening interrupts is programmed by the Set Multiple
Mode command, which must be executed prior to the Read Multiple command. When the Read Multiple
command is issued, the Sector Count Register contains the number of sectors (not the number of blocks or the
block count) requested. If the number of requested sectors is not evenly divisible by the block count, as many
full blocks as possible are transferred, followed by a final, partial block transfer. The partial block transfer is for
n sectors, where:
n = (sector count) module (block count).
If the Read Multiple command is attempted before the Set Multiple Mode command has been executed or when
Read Multiple commands are disabled, the Read Multiple operation is rejected with an Aborted Command error.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.41
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
F-100_data_sheet_CA-HxBR_Rev141.doc
Page 23 of 51
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