NVM Express SCSI Command Mappings

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RECEIVE DIAGNOSTIC RESULTS (1Ch)

RECEIVE DIAGNOSTIC RESULTS (1Ch) command

Bit Byte	7	6	5	4	3	2	1	0
0	OPERATION CODE (1Ch)
1	Reserved							PCV
2	PAGE CODE
3	ALLOCATION LENGTH (15:8)
4	ALLOCATION LENGTH (7:0)
5	CONTROL

A page code valid (PCV) bit set to one specifies that the device server return the diagnostic page specified in the PAGE CODE field.

SEND DIAGNOSTIC (1Dh)

SEND DIAGNOSTIC (1Dh)

Bit Byte	7	6	5	4	3		2		1	0
0	OPERATION CODE (1Dh)
1	SELF-TEST CODE			PF	Reserved	SELF TEST		DEVOFFL		UNIT OFFL
2	Reserved
3	PARAMETER LIST LENGTH (15:8)
4	PARAMETER LIST LENGTH (7:0)
5	CONTROL

ATA PASS-THROUGH (12) command

ATA PASS-THROUGH (12) command (A1h)

Bit Byte	7	6	5		4	3	2	1	0
0	OPERATION CODE (A1h)
1	MULTIPLE_COUNT				PROTOCOL			Reaseved
2	OFF_LINE			CK_COND	Reserved	T_DIR	BYT_BLOK	T_LENGTH
3	FEATURES (0:7)
4	SECTOR_COUNT (0:7)
5	LBA_LOW (0:7)
6	LBA_MID (0:7)
7	LBA_HIGH (0:7)
8	DEVICE
9	COMMAND
10	Reserved
11	CONTROL

ATA Protocols

Protocol	Description
0	Hard Reset
1	SRST
2	Reserved
3	Non-data
4	PIO Data-In
5	PIO Data-Out
6	DMA
7	DMA Queued
8	Device Diagnostic
9	DEVICE RESET
10	UDMA Data In
11	UDMA Data Out
12	FPDMA
13, 14	Reserved
15	Return Response Information

ATA PASS-THROUGH (12/16) DEVICE field

Bit	7	6	5	4	3	2	1	0
	Obsolete	Command Specific	Obsolete	DEV	Command Specific

T_LENGTH Values

Protocol	Description
00h	No data is transferred
01h	The transfer length is specified in the FEATURE field.
02h	The transfer length is specified in the SECTOR_COUNT field.
03h	The transfer length is specified in the STPSIU field.

Extended ATA Status Return Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	DESCRIPTOR CODE (09h)
1	ADDITIONAL DESCRIPTOR LENGTH (0ch)
2	Reserved							EXTEND
3	ERROR
4	SECTOR_COUNT (8:15)
5	SECTOR_COUNT (0:7)
6	LBA_LOW (8:15)
7	LBA_LOW (0:7)
8	LBA_MID (8:15)
9	LBA_MID (0:7)
10	LBA_HIGH (8:15)
11	LBA_HIGH (0:7)
12	DEVICE
13	STATUS
14
15

ATA PASS-THROUGH (16) command

ATA PASS-THROUGH (16) command (85h)

Bit Byte	7	6	5		4	3	2	1	0
0	OPERATION CODE (85h)
1	MULTIPLE_COUNT				PROTOCOL			EXTEND
2	OFF_LINE			CK_COND	Reserved	T_DIR	BYT_BLOK	T_LENGTH
3	FEATURES (8:15)
4	FEATURES (0:7)
5	SECTOR_COUNT (8:15)
6	SECTOR_COUNT (0:7)
7	LBA_LOW (8:15)
8	LBA_LOW (0:7)
9	LBA_MID (8:15)
10	LBA_MID (0:7)
11	LBA_HIGH (8:15)
12	LBA_HIGH (0:7)
13	DEVICE
14	COMMAND
15	CONTROL

ATA Protocols

Protocol	Description
0	Hard Reset
1	SRST
2	Reserved
3	Non-data
4	PIO Data-In
5	PIO Data-Out
6	DMA
7	DMA Queued
8	Device Diagnostic
9	DEVICE RESET
10	UDMA Data In
11	UDMA Data Out
12	FPDMA
13, 14	Reserved
15	Return Response Information

Extended ATA Status Return Descriptor

Bit Byte	7	6	5	4	3	2	1	0
0	DESCRIPTOR CODE (09h)
1	ADDITIONAL DESCRIPTOR LENGTH (0ch)
2	Reserved							EXTEND
3	ERROR
4	SECTOR_COUNT (8:15)
5	SECTOR_COUNT (0:7)
6	LBA_LOW (8:15)
7	LBA_LOW (0:7)
8	LBA_MID (8:15)
9	LBA_MID (0:7)
10	LBA_HIGH (8:15)
11	LBA_HIGH (0:7)
12	DEVICE
13	STATUS