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PC87306 Datasheet(PDF) 53 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87306
Description  PC87306 SuperI/OTM Enhanced Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, Infrared Interface, IEEE 1284 Pa
PDF  110 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87306 Datasheet(HTML) 53 Page - National Semiconductor (TI)

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40 FDC Command Set Description (Continued)
SENSE DRIVE STATUS
Command Phase
00000
1
0
0
XXXXXHDDR1
DR0
Execution Phase
Disk drive status information is detected
and reported
Result Phase
Status Register 3
SENSE INTERRUPT
Command Phase
00001000
Execution Phase
Status of interrupt is reported
Result Phase
Status Register 0
Present Track Number (PTR)
MSN of PTR
0000
Note
The third Result Phase byte can only be read if ETR is set in the
Mode Command
SET TRACK
Command Phase
0
WNR
1
0
0
0
0
1
0
0
1
1
0
MSB
DS1
DS0
Present Track Number (PTR)
Execution Phase
Internal register selected by MSB of DS1
or DS0 is read or written
Result Phase
Value
SPECIFY
Command Phase
0000001
1
Step Rate Time
Motor Off Time
Motor On Time
DMA
Execution Phase
Internal registers are written
Result Phase
None
VERIFY
Command Phase
MT
MFM
SK
1
0
1
1
0
EC
X
X
X
X
HD
DR1
DR0
Track Number
Drive Head Number
Sector Number
Bytes per Sector
End of Track Sector Number
Intersector Gap Length
Data LengthSector Count
Execution Phase
Data is read from disk but not transferred
to the system
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
VERSION
Command Phase
00010000
Execution Phase
None
Result Phase
10010000
WRITE DATA
Command Phase
MT
MFM
0
0
0
1
0
1
IPS
X
X
X
X
HD
DR1
DR0
Track Number
Drive Head Number
Sector Number
Bytes per Sector
End of Track Sector Number
Intersector Gap Length
Data Length
53



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