IBM DJSA-210 Hard Drive Specifications - Page 146

Read Multiple C4h, LBA mode, this register contains LBA bits 0-7. L = 1

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13.15 Read Multiple (C4h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature 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 0 0 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 0V0V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 88. Read Multiple command (C4h) The Read Multiple command reads one or more sectors of data from disk media and then transfers the data from the device to the host. The sectors are transferred through the Data Register 16 bits at a time. The command execution is identical to the Read Sectors command with one exception: an interrupt is generated for each block-as defined by the Set Multiple command-instead of for each sector. Output Parameters To The Device Sector Count This indicates the number of continuous sectors to be transferred. If zero is specified then 256 sectors will be transferred. Sector Number This indicates the sector number of the first sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 0-7. (L = 1) Cylinder High/Low This indicates the cylinder number of the first sector to be transferred. (L = 0) In LBA mode this register contains LBA bits 8-15 (Low) and bits 16-23 (High). (L = 1) H This indicates the head number of the first sector to be transferred. (L = 0) In LBA mode this register contains LBA bits 24-27. (L = 1) Travelstar 32GH/30GT/20GN hard disk drive specifications 132

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13.15 Read Multiple (C4h)
see below
Status
1 1 0 0 0 1 0 0
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
– – – – – – – –
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
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 88. Read Multiple command (C4h)
The Read Multiple command reads one or more sectors of data from disk media and then transfers the
data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time. The command execution is
identical to the Read Sectors command with one exception: an interrupt is generated for each block—as
defined by the Set Multiple command—instead of for each sector.
Output Parameters To The Device
Sector Count
This indicates the number of continuous sectors to be transferred. If zero is
specified then 256 sectors will be transferred.
Sector Number
This indicates the sector number of the first sector to be transferred. (L = 0) In
LBA mode, this register contains LBA bits 0–7. (L = 1)
Cylinder High/Low
This indicates the cylinder number of the first sector to be transferred. (L = 0) In
LBA mode this register contains LBA bits 8–15 (Low) and bits 16–23 (High). (L =
1)
H
This indicates the head number of the first sector to be transferred. (L = 0) In LBA
mode this register contains LBA bits 24–27. (L = 1)
Travelstar 32GH/30GT/20GN hard disk drive specifications
132