Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet page 913

Intel® Management Engine Interface (MEI) Subsystem Registers (D22:F0)
23.6.21 IDESD1R—IDE Status Device 1 Register
(IDER—D22:F2)
Address Offset: 07h
Default Value:
This register implements the status register of the slave device (DEV = 1). This register
is read only by the Host. Host read of this register clears the slave device's interrupt.
When the HOST writes to the same address it writes to the command register.
The bits description is for ATA mode.
Bit
7
6
5
4
3
2
1
0
23.6.22 IDECR—IDE Command Register (IDER—D22:F2)
Address Offset: 07h
Default Value:
This register implements the Command register of the command block of the IDE
function. This register can be written only by the Host.
When the HOST reads the same address it reads the Status register DEV0 if DEV=0 or
Status Register DEV1 if DEV=1 (Drive/Head register bit [4]).
Bit
7:0
Datasheet
80h
Busy (BSY)— R/W. This bit is set by hardware when the IDECR is being written and
DEV=0, or when SRST bit is asserted by the Host or host system reset or D3-to-D0
transition of the IDE function.
This bit is cleared by FW write of 0.
Drive Ready (DRDY)— R/W. When set, indicates drive is ready for command.
Drive Fault (DF)— R/W. Indicates Error on the drive.
Drive Seek Complete (DSC) — R/W. Indicates Heads are positioned over the
desired cylinder.
Data Request (DRQ) — R/W. Set when the drive wants to exchange data with the
Host using the data register.
Corrected Data (CORR) — R/W. When set indicates a correctable read error has
occurred.
Index (IDX) — R/W. This bit is set once per rotation of the medium when the index
mark passes under the read/write head.
Error (ERR) — R/W. When set, this bit indicates an error occurred in the process of
executing the previous command. The Error Register of the selected device contains
the error information
00h
IDE Command Data (IDECD) — R/W. Host sends the commands (read/ write,
etc.) to the drive using this register.
Attribute: R/W
Size: 8 bits
Description
Attribute: R/W
Size: 8 bits
Description
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