Quantum Audio STT2401A Manual De Usuario
ATAPI Interface
Chapter 5
Seagate Travan 40 Product Manual
Page 109
SET FEATURES (ATA Command EF)
This command is used by the Host to establish parameters that affect the execution
of certain device features.
of certain device features.
At power on, or after a hardware reset, the default setting of the functions specified
by the subcommands are vendor specific. If any subcommand input value is not
supported or is invalid, the device posts an Aborted command error.
by the subcommands are vendor specific. If any subcommand input value is not
supported or is invalid, the device posts an Aborted command error.
Host Taskfile Registers—Inputs
Data Bits
Host Taskfile
Register
Register
7
6
5
4
3
2
1
0
HEX
Features
Subcommand code
Sector Count
Subcommand specific
Sector
Number
Number
Subcommand specific
Byte Count
High
High
Subcommand specific
Byte Count
Low
Low
Subcommand specific
Device/Head
rsvd
LBA
rsvd
DEV
SAM LUN (not used)
Command
command
EF
Supported Subcommands
Value
Description
03h
Set transfer mode, based on the value in the Sector Count register.
66h
Disable revert to POR values
Set Transfer Mode Values
Mode
Bits 7:3
Bits 2:0
PIO default mode
00000b
000b
PIO default mode, disable IORDY (not supported)
00000b
001b
PIO flow control transfer mode
00001b
mode
(retired)
00010b
N/A
Multiword DMA mode
00100b
mode
Ultra DMA mode
(not supported)
01000b
mode
Reserved
10000b
N/A
Host Taskfile Registers—Outputs
Data Bits