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HOST SOFTWARE INTERFACE
6 – 3
Command RegisterCommand Register
Command RegisterCommand Register
Command Register
Contains code for the command to be performed. Additional command information should be written to the
task file before the Command register is loaded. When this register is written, the BUSY bit in the Status
register sets, and interrupt request to the host clears; invalid commands abort. (Detailed information on interface
commands is given in Section 7.) Hex values for valid command formats follow:
Read CommandsRead Commands
Read CommandsRead Commands
Read Commands
Read Sector(s) 20h Normal reads; retries enabled
21h Normal reads; retries disabled
22h Read Long; retries enabled
23h Read Long; retries disabled
Read Verify Sector(s) 40h Retries enabled
41h Retries disabled
Read Sector Buffer E4h
Read Multiple C4h
Read DMA C8h
C9h No retries
Write CommandsWrite Commands
Write CommandsWrite Commands
Write Commands
Write Sector(s) 30h Normal writes; retries enabled
31h Normal writes; retries disabled
32h Write Long; retries enabled
33h Write Long; retries disabled
Write Verify Sector(s) 3Ch
Write Sector Buffer E8h
Write Multiple C5h
Write DMA CAh
CBh No retries
Mode Set/Check CommandsMode Set/Check Commands
Mode Set/Check CommandsMode Set/Check Commands
Mode Set/Check Commands
Set Features EFh
Set Multiple Mode C6h
Read Native Max Address F8h
Set Max Mode F9h
Power Mode CommandsPower Mode Commands
Power Mode CommandsPower Mode Commands
Power Mode Commands
Standby Immediate 94/E0h Stops drive spindle; do not change time-out value
Idle Immediate 95/E1h Starts spindle; do not change time-out value
Standby 96/E2h Stops spindle; change time-out value
Idle 97/E3h Starts spindle; change time-out value
Check Power Mode 98/E5h
Set Sleep Mode 99/E6h
Initialization CommandsInitialization Commands
Initialization CommandsInitialization Commands
Initialization Commands
Identify Drive ECh
Initialize Drive Parameters 91h
Re-calibrate 1xh
Seek, Format, and Diagnostic CommandsSeek, Format, and Diagnostic Commands
Seek, Format, and Diagnostic CommandsSeek, Format, and Diagnostic Commands
Seek, Format, and Diagnostic Commands
Seek 7xh
Format Track 50h
Execute Drive Diagnostic 90h
S.M.A.R.T. CommandsS.M.A.R.T. Commands
S.M.A.R.T. CommandsS.M.A.R.T. Commands
S.M.A.R.T. Commands
Execute S.M.A.R.T. B0h