IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive, Specifications

Page: 144 / 212

12.14 Read Long (22h/23h)
see below Status 0 0 1 0 0 0 1 R 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 Sector Count 0 0 0 0 0 0 0 1 Sector Count
see below Error - - - - - - - - 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 0 0
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 100. Read Long Command (22h/23h)
The Read Long command read the designated one sector of data and the ECC bytes from disk media,
then transfers the data and ECC bytes from the device to the host.
After 512 bytes of data have been transferred, the device will keep setting DRQ=1 to indicate that the
device is ready to transfer the ECC bytes to the host. The data is transferred 16 bits at a time; the ECC
bytes are transferred 8 bits at a time. The number of ECC bytes is 4 or 40 according to setting of Set
Feature option. The default setting is 4 bytes of ECC data.
The command makes a single attempt to read the data and does not check the data using ECC, what-
ever is read is returned to the host.
Output parameters to the device
Sector Count The number of continuous sectors to be transferred. The Sector Count must be
set to one.
Sector Number The sector number of the sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 0 - 7. (L=1)
Cylinder High/Low The cylinder number of the sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1)
Deskstar 40GV & 75GXP hard disk drive specifications
132