13.16 Read Multiple (C4h)
see belowStatus1 1 0 0 0 1 0 0Command
- - - - H H H HDevice/Head1 L 1 D H H H HDevice/Head
V V V V V V V VCylinder HighV V V V V V V VCylinder High
V V V V V V V VCylinder LowV V V V V V V VCylinder Low
V V V V V V V VSector NumberV V V V V V V VSector Number
V V V V V V V VSector CountV V V V V V V VSector Count
see belowError- - - - - - - -Feature
- - - - - - - -Data- - - - - - - -Data
7 6 5 4 3 2 1 0Register7 6 5 4 3 2 1 0Register
Command Block Input RegistersCommand Block Output Registers
V-0-V0V0V0V0V0V0
ERRIDXCORDRQDSCDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 95. 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, 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 48GH, 30GN & 15GN hard disk drive specifications
143
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