IT8712F Datasheet, PDF (112/189 Pages) List of Unclassifed Manufacturers – Environment Control -Low Pin Count Input / Output(EC - LPC I/O)

IT8712F
Table 9-5. Main Status Register (MSR)
Bit
Symbol
Description
7
RQM Request for Master
FDC Request for Master.
0: The FDC is busy and cannot receive data from the host.
1: The FDC is ready and the host can transfer data.
6
DIO
Data I/O Direction
Indicates the direction of data transfer once a RQM has been set.
0: Write.
1: Read.
5
NDM Non-DMA Mode
This bit selects Non-DMA mode of operation.
0: DMA mode selected.
1: Non-DMA mode selected.
This mode is selected via the SPECIFY command during the Execution phase of a
command.
4
CB
Diskette Control Busy
Indicates whether a command is in progress (the FDD is busy).
0: A command has been executed and the end of the Result phase has been
reached.
1: A command is being executed.
3-2
-
Reserved
1
DBB Drive B Busy
Indicates whether Drive B is in the SEEK portion of a command.
0: Not busy.
1: Busy.
0
DAB Drive A Busy
Indicates whether Drive A is in the SEEK portion of a command.
0: Not busy.
1: Busy.
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IT8712F V0.81