Silicon Image SiliconDrive SSD-DXXX(I)-4210 - Manual (Page 44)

ATA R EGISTERS SSD-D XXX (I)-4210 D ATA S HEET
S ILICON S YSTEMS P ROPRIETARY
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4210D-03DSR P AGE 35 F EBRUARY 2, 2009
S TATUS R EGISTER
The Status register provides the device’s current status to the host. The status
register is an 8-bit read-only register. When the contents of the register are
read by the host, the IREQ# bit is cleared.
Table 22: Status Register
Operation D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Read/Write BSY DRDY DWF DSC DRQ CORR IDX ERR
Default Value 0 0 0 0 0 0 0 0
Bit(s) Description
7
Busy (BSY).
Set when the drive is busy and unable to process any
new ATA commands.
6
Data Ready (DRDY).
Set when the device is ready to accept ATA
commands from the host.
5
Drive Write Fault (DWF).
Always set to 0.
4
Drive Seek Complete (DSC).
Set when the drive heads have been
positioned over a specific track.
3
Data Request (DRQ).
Set when a device is ready to transfer a word
or byte of data to or from the host and the device.
2
Corrected Data (CORR).
Always set to 0.
1
Index (IDX).
Always set to 0.
0
Error (ERR).
Set when an error occurs during the previous ATA
command.