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host then reads the (512 * sector-count) bytes of data from the Card using DMA. While DMARQ is asserted by the
Card, 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 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 amount of data transferred is indeterminate.
When a Read DMA Ext command is received by the Card and 8 bit transfer mode has been enabled by the Set
Features command, the Card shall return the Aborted error.
Table 29: Read DMA Ext
register write
previous
current
Task File Register
15:8
7
6
5
4
3
2
1
0
COMMAND
-
25h
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
6.15 Read FPDMA Queued (60h) (if NCQ feature set supported)
This command is mandatory for devices implementing the NCQ feature set (see feature set reference).
This command requests that data to be transferred from the device to the host.
When the Forced Unit Access (FUA) bit is set to one the device shall retrieve the data from the card regardless of
whether the device holds the requested information in its volatile cache. If the device holds a modified copy of
the requested data as a result of having volatile cached writes, the modified data shall be written to the non-
volatile media before being retrieved from the non-volatile media as part of this operation. When the FUA bit is
cleared to zero the data shall be retrieved either from the device's non-volatile media or cache.
Table 30: Read FPDMA queued
Task File Register
15:8
7
6
5
4
3
2
1
0
COMMAND
-
61h
DRIVE/HEAD
-
FUA
1
nu
0
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
LBA (47:40)
LBA (39:32)
LBA (31:24)
LBA23:16
LBA15:8
LBA7:0
SECTOR COUNT
nu
NCQ Tag
nu
FEATURES
The number of logical sectors to be transferred. A value of 0000h indicates that 65,536
logical sectors are to be transferred.
For further details see the ATA8 specification.
6.16 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 is 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: 0.92
CH-9552 Bronschhofen
Switzerland
F-240_data_sheet_CA-HxBV_Rev092.doc
Page 27 of 56
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