IBM Deskstar 120 GXP, Specifications

Page: 144 / 211

11.14 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 SRV 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 112. 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.
When 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 Starting sector number or LBA address bits 7 - 0.
Cylinder High/Low Starting cylinder number or LBA address bits 23 - 8.
H Starting head number or LBA address bits 27 - 24.
Deskstar 120GXP hard disk drive specifications
130