PC87332VLJ-5 NSC [National Semiconductor], PC87332VLJ-5 Datasheet - Page 55

• Manufacturer Part Number: PC87332VLJ-5
• Description: PC87332VLJ (3.3V/5V) and PC87332VLJ-5 (5V) (SuperI/OTM III Premium Green) Floppy Disk Controller, Dual UARTs, IEEE1284 Parallel Port, and IDE Interfac
• Manufacturer: NSC [National Semiconductor]

4 0 FDC Command Set Description
SENSE DRIVE STATUS
Command Phase
Execution Phase Disk drive status information is detected
and reported
Result Phase
SENSE INTERRUPT
Command Phase
Execution Phase Status of interrupt is reported
Result Phase
Note The third Result Phase byte can only be read if ETR is set in the Mode
SET TRACK
Command Phase
Execution Phase Internal register selected by MSB of DS1
or DS0 is read or written
Result Phase
SPECIFY
Command Phase
Execution Phase Internal registers are written
Result Phase None
0
0
X
0
0
0
Command
Step Rate Time
WNR
0
X
MSN of PTR
0
0
0
0
X
0
Present Track Number (PTR)
Present Track Number (PTR)
1
1
0
Motor On Time
X
Status Register 3
Status Register 0
0
0
1
0
0
Value
X
0
0
0
0
0
1
HD
MSB
1
0
Motor Off Time
0
0
0
DR1
DS1
0
1
0
0
0
DMA
DR0
DS0
1
0
1
0
0
(Continued)
55
VERIFY
Command Phase
Execution Phase Data is read from disk but not transferred
to the system
Result Phase
VERSION
Command Phase
Execution Phase None
Result Phase
MT
EC
0
1
MFM
0
0
X
End of Track Sector Number
0
0
Data Length Sector Count
SK
X
Intersector Gap Length
Drive Head Number
Status Register 0
Status Register 1
Status Register 2
Bytes per Sector
Bytes per Sector
Sector Number
Sector Number
Track Number
Track Number
Head Number
1
1
X
1
X
0
0
0
HD
1
0
0
DR1
1
0
0
DR0
0
0
0