參數(shù)資料
型號: IT8673F
廠商: Electronic Theatre Controls, Inc.
英文描述: GT 35C 35#12 SKT PLUG
中文描述: 先進的輸入/輸出(高級I / O)的初步規(guī)范V0.5
文件頁數(shù): 60/128頁
文件大?。?/td> 780K
代理商: IT8673F
IT8673F
0
50
Table 11-5. Main Status Register (MSR)
Bit
Symbol
Name
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.
Indicates the direction of data transfer once a RQM has been set.
0: Write
1: Read
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.
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.
Reserved
Indicates whether Drive B is in the SEEK portion of a command.
0: Not busy.
1: Busy.
Indicates whether Drive A is in the SEEK portion of a command.
0: Not busy.
1: Busy.
6
DIO
Data I/O
Direction
5
NDM
Non-DMA
Mode
4
CB
Diskette
Control Busy
3-2
1
-
-
Drive B Busy
DBB
0
DAB
Drive A Busy
11.4.8.4 Data Rate Select Register (DSR, FDC Base Address + 04h)
This is a
write only
register. It is used to determine the data rate, amount of write precompensation, power
down mode, and software reset. The data rate of the floppy controller is the most recent write of either the
DSR or DCR. The DSR is unaffected by a software reset. The DSR can be set to 02h by a hardware reset,
and the “02h” represents the default precompensation, and 250 Kbps indicates the data transfer rate.
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