Read Multiple (C4H); Table 83 Read Multiple Command (C4H) - Hitachi HTS542516K9SA00 Specifications

14.17

Read Multiple (C4h)

Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
Error Register
7 6 5 4
CRC UNC 0 IDN
0 V 0 V

Table 83 Read Multiple Command (C4h)

The Read Multiple command reads one or more sectors of data from disk media, then transfers the
data from the device to the host.
The sectors are transferred through the Data Register 16 bits at a time. Command execution is
identical to the Read Sectors command except that 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
LBA Low
LBA High/Mid
H
Input Parameters From The Device
Sector Count
LBA Low
LBA High/Mid
H
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
- L - - H H H H
1 1 0 0 0 1 0 0
3 2 1 0
0 ABT T0N AM
N
0 V 0 0
The number of continuous sectors to be transferred. If zero is specified, then 256 sectors
will be transferred.
The sector number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 0 - 7. (L=1)
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 8 - 15 (Mid), 16 - 23 (High). (L=1)
The head number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 24 - 27. (L=1)
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable error occurs.
The sector number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
The cylinder number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8-15 (Mid), 16-23 (High). (L=1)
The head number of the last transferred sector. (L=0)
LBA mode, this register contains current LBA bits 24 - 27. (L=1)
Page 112 of 171
5K250 (SATA) OEM Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
Status Register
7 6 5 4
BSY RDY DF DSC DRQ COR IDX ERR
0 V 0 V
7 6 5 4 3 2 1 0
- - - - - - - -
...See Below...
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
- - - - H H H H
...See Below...
3 2 1 0
- 0 0 V