IBM DTCA-24090 Hard Drive Specifications - Page 150

Set Multiple

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12.28 Set Multiple (C6h) Command Block Output Registers Register 76543210 Data Feature Sector Count V V V V V V V V Sector Number Cylinder Low Cylinder High Device/Head 1 1D Command 11000110 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0 0 V Figure 92. Set Multiple Command (C6h) The Set Multiple command enables the device to perform Read and Write Multiple commands and establishes the block size for these commands. The block size is the number of sectors to be transferred for each interrupt. The default block size after power up, or hard reset is 0, and Read Multiple and Write Multiple commands are disabled. If an invalid block size is specified, an Abort error will be returned to the host, and Read Multiple and Write Multiple commands will be disabled. Output Parameters To The Device Sector Count. The block size to be used for Read Multiple and Write Multiple commands. Valid block sizes can be selected from 0, 2, 4, 8 or 16. If 0 is specified, then Read Multiple and Write Multiple commands are disabled. 142 OEM Specifications of DTCA-2xxxx 2.5 inch H D D

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12.28
Set Multiple
(C6h)
Command Block Output Registers
Command Block Input Registers
Register
76543210
Register
76543210
Data
Data
Feature
Error
...See Below...
Sector Count
VVVVVVVV
Sector Count
Sector Number
Sector Number
Cylinder Low
Cylinder Low
Cylinder High
Cylinder High
Device/Head
1
1D
Device/Head
Command
11000110
Status
...See Below...
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC UNC
0
IDN
0
ABT T0N AMN
BSY RDY DF
DSC DRQ COR IDX ERR
0
0
0
0
0
V
0
0
0
V
0
0
V
Figure 92. Set Multiple Command (C6h)
The Set Multiple command enables the device to perform Read and Write Multiple commands and estab-
lishes the block size for these commands.
The block size is the number of sectors to be transferred for each
interrupt.
The default block size after power up, or hard reset is 0, and Read Multiple and Write Multiple commands
are disabled.
If an invalid block size is specified, an Abort error will be returned to the host, and Read Multiple and Write
Multiple commands will be disabled.
Output Parameters To The Device
Sector Count.
The block size to be used for Read Multiple and Write Multiple commands.
Valid
block sizes can be selected from 0, 2, 4, 8 or 16.
If 0 is specified, then Read Multiple
and Write Multiple commands are disabled.
142
OEM Specifications of DTCA-2xxxx 2.5 inch HDD