Maxtor 6800 manual Command Register

HOST SOFTWARE INTERFACE

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 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 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 Commands

Set Features	EFh
Set Multiple Mode	C6h

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 Commands

Identify	Drive	ECh
Initialize	Drive Parameters	91h
Re-calibrate		1xh

Seek, Format, and Diagnostic Commands

Seek	7xh
Format Track	50h
Execute Drive Diagnostic	90h

S.M.A.R.T. Commands

Execute S.M.A.R.T. B0h

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