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ATA Commands Functional Description
Zeus Ultra DMA Solid State Drives 21
2.4 ATA COMMANDS
This section provides information on the ATA commands supported on the Zeus SSD.
The commands are issued to the ATA by loading the required registers in the command
block with the supplied parameter, and then writing the command code to the register.
2.4.1 ATA Command Flow
1 Write the necessary parameter to the related Task File registers and by writing the
command in the Command register, the command is issued.
2 Upon the receipt of the command, the device sets the BSY bit within 400 n/sec.
3 If a data transfer command (e.g., Read command, Write command) was called, the
DRQ bit in the Status register will come up, indication that the transfer can begin.
Table 6. ATA (IDE) Bus Addressing Modes
#CS0 #CS1 DA2 DA1 DA0 #IORD = “0” #IOWR - “0”
1 1 X X X Hi-Z Not Used
1 0 0 X X Hi-Z Not Used
1 0 1 0 X Hi-Z Not Used
0 0 X X X Invalid Invalid
1 0 1 1 0 Alternate status Device Control
1 0 1 1 1 Device address Not Used
0 1 0 0 0 Data Data
0 1 0 0 1 Error Feature
0 1 0 1 0 Sector Count Sector Count
0 1 0 1 1 Sector Number Sector Number
0 1 1 0 0 Cylinder Low Cylinder Low
0 1 1 0 1 Cylinder High Cylinder High
0 1 1 1 0 Drive/Head Drive/Head
0 1 1 1 1 Status Command