F81865F データシートの表示（PDF） - Feature Integration Technology Inc.
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コンポーネント説明
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F81865F Datasheet PDF : 128 Pages
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Status Registers 0
Bit
Name
7-6
IC
5
SE
4
EC
3
NR
2
HD
1-0
DS
Status Registers 1
Bit
Name
7
EN
6
DE
4
OR
3
Reserved
2
ND
1
NW
F81865
R/W Default
Description
Interrupt code :
00: Normal termination of command.
R
- 01: Abnormal termination of command.
10: Invalid command.
11: Abnormal termination caused by poling.
Seek end.
R
- Set when a SEEK or RECALIBRATE or a READ or WRITE with implied seek
command is completed.
Equipment check.
R
- 0: No error
1: When a fault signal is received form the FDD or the TRK0# signal fails to
occur after 77 step pulses.
Not ready.
R
- 0: Drive is ready
1: Drive is not ready.
Head address.
R
-
The current head address.
Drive select.
00: Drive A selected.
R
- 01: Drive B selected.
10: Drive C selected.
11: Drive D selected.
R/W Default
Description
End of Track.
R
-
Set when the FDC tries to access a sector beyond the final sector of a cylinder.
Data Error.
R
-
The FDC detect a CRC error in either the ID field or the data field of a sector.
Overrun/Underrun.
R
- Set when the FDC is not serviced by the host system within a certain time
interval during data transfer.
-
- Unused. This bit is always “0”
No Data.
Set when the following conditions occurred:
R
- 1. The specified sector is not found during any read command.
2. The ID field cannot be read without errors during a READ ID command.
3. The proper sector sequence cannot be found during a READ TRACK
command.
No Writable
R
-
Set when WPT# is active during execution of write commands.
24
May, 2010
V0.28P
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