IBM IC35L020 Hard Drive Specifications - Page 140

Read DMA Queued C7h

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15.13 Read DMA Queued (C7h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature V V V V V V V V Sector Count V V V V V V V V Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head 1 L 1 D H H H H Command 1 1 0 0 0 1 1 1 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count V V V V V V V V Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head - - - - H H H H Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN VV0V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 91. Read DMA Queued Command (C7h) This command executes in a similar manner to a READ DMA command. The device may perform a bus release or it may execute the data transfer without performing a bus release if the data is ready to transfer. If the device performs a bus release, the host shall reselect the device using the SERVICE command. Once the data transfer is begun, the device does not perform a bus release until the entire data transfer has been completed. Output parameters to the device Feature The number of sectors to be transferred. A value of 00h indicates that 256 sectors are to be transferred. Sector Count Bits 7-3 (Tag) contain the Tag for the command being delivered. Sector Number The starting sector number or LBA address bits 7-0. Cylinder High/Low The starting cylinder number or the LBA address bits 23-8. H The starting head number or the LBA address bits 27-24. Deskstar 60 GXP Hard disk drive specification 126

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15.13 Read DMA Queued (C7h)
see below
Status
1 1 0 0 0 1 1 1
Command
- - - - H H H H
Device/Head
1 L 1 D H H H H
Device/Head
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder Low
V V V V V V V V
Cylinder Low
V V V V V V V V
Sector Number
V V V V V V V V
Sector Number
V V V V V V V V
Sector Count
V V V V V V V V
Sector Count
see below
Error
V V V V V V V V
Feature
- - - - - - - -
Data
- - - - - - - -
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input
Registers
Command Block Output
Registers
V
–
0
–
V
0
V
0
V
0
V
0
V
0
V
V
ERR
IDX
COR
DRQ
DSC
DF
RDY
BSY
AMN
T0N
ABT
0
IDN
0
UNC
CRC
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Status Register
Error Register
Figure 91. Read DMA Queued Command (C7h)
This command executes in a similar manner to a READ DMA command. The device may perform a bus
release or it may execute the data transfer without performing a bus release if the data is ready to
transfer.
If the device performs a bus release, the host shall reselect the device using the SERVICE command.
Once the data transfer is begun, the device does not perform a bus release until the entire data transfer
has been completed.
Output parameters to the device
Feature
The number of sectors to be transferred. A value of 00h indicates that
256 sectors are to be transferred.
Sector Count
Bits 7–3 (Tag) contain the Tag for the command being delivered.
Sector Number
The starting sector number or LBA address bits 7–0.
Cylinder High/Low
The starting cylinder number or the LBA address bits 23–8.
H
The starting head number or the LBA address bits 27–24.
Deskstar
60 GXP Hard disk drive specification
126