For reasons of backward compatibility some commands are implemented as ‘no operation’ NOP.
Table 13 summarizes the Drive command set with the paragraphs that follow describing the individual
commands and the task file for each.
Table 13: ATA Command Set (1)
Command
Code
FR(1)
SC(2)
SN(3)
CY(5:4)
DH(6)
LBA(5:3)
Check Power Mode
E5h or 98h
D
Data Set Management
Execute Drive Diagnostic
Flush cache
Flush cache Ext
06h
90h
E7h
EAh
YY
D
D
D
D
YY
Format track
50h
Y
Y
Y
Y
Identify Drive
ECh
D
Idle
Idle Immediate
Media Lock
Media Unlock
NOP
Read Buffer
E3h or 97h
E1h or 95h
DEh
DFh
00h
E4h
Y
D
D
D
D
D
D
Read DMA
Read DMA Ext
C8
25h
Y
YY
Y
Y
Y
D
Y
YY
Read FPDMA Queued
Read Multiple
60h
C4h
Y
Y
Y
Y
Y
Y
Y
D
Y
Y
Y
Read Multiple Ext
Read native max address
Read native max address Ext
29h
F8h
27h
YY
D
D
D
YY
Read Sector(s)
Read Sector(s) Ext 2)
Read Verify Sector(s)
Read Verify Sector(s) Ext
20h
24h
40h or 41h
42h
Y
YY
Y
YY
Y
YY
Y
YY
Y
YY
Y
YY
Y
D
Y
D
Y
YY
Y
YY
Recalibrate
Security Disable Password
Security Erase Prepare
Security Erase Unit
Security Freeze Lock
Security Set Password
Security Unlock
1Xh
F6h
F3h
F4h
F5h
F1h
F2h
D
D
D
D
D
D
D
Seek
Set Features
7Xh
EFh
Y
Y
Y
Y
D
Y
Set max address
Set max address Ext
F9h
37h
Y
YY
Y
YY
Y
YY
Y
D
Y
YY
Set Multiple Mode
Set Sleep Mode
C6h
E6h or 99h
Y
D
D
S.M.A.R.T.
B0h
Y
Y
Y
D
Stand By
Stand By Immediate
Write Buffer
E2h or 96h
E0h or 94h
E8h
D
D
D
Write DMA
Write DMA Ext
Write FPDMA Queued
Write Multiple
Write Multiple Ext
Write Sector(s)
Write Sector(s) Ext
Write Verify
CAh or CBh
35h
61h
C5h
39h
30h
34h
3Ch
Y
YY
Y
Y
YY
Y
YY
Y
Y
YY
Y
Y
YY
Y
YY
Y
Y
YY
Y
Y
YY
Y
YY
Y
Y
D
D
Y
D
Y
D
Y
Y
YY
Y
Y
YY
Y
YY
Y
1.
2.
FR = Features Register (1), SC = Sector Count Register (2), SN = Sector Number Register (3), CY = Cylinder
Registers (5:4),
DH = Drive/Head Register (6), LBA = Logical Block Address Mode Supported (see command descriptions for
use),
Y – The register contains a valid parameter for this command. For the Drive/Head Register Y means both the
Drive and head parameters are used.
YY – registers must be written twice for 48bit LBA commands
D – only the Drive parameter is valid and not the head parameter C – the register contains command
specific data (see command descriptors for use).
To read out the higher and lower byte of the 16bit registers bit7 of the Device Control Register (write to
Alternate status register) must be set to 1 or 0, respectively.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 0.92
CH-9552 Bronschhofen
Switzerland
F-240_data_sheet_CA-HxBV_Rev092.doc
Page 15 of 56
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