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PC8477B Datasheet(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC8477B
Description  Advanced Floppy Disk Controller
PDF  54 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC8477B Datasheet(HTML) 16 Page - National Semiconductor (TI)

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40 Command Set Description (Continued)
READ DATA
Command Phase
MT
MFM
SK
0
0
1
1
0
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
Execution Phase
Data read from disk drive is transferred
to system via DMA or Non-DMA modes
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
READ DELETED DATA
Command Phase
MT
MFM
SK
0
1
1
0
0
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
Execution Phase
Data read from disk drive is transferred
to system via DMA or Non-DMA modes
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
READ ID
Command Phase
0
MFM
0
0
1
0
1
0
X
X
XXXHDDR1
DR0
Execution Phase
Controller reads first ID Field header
bytes it can find and reports these bytes to the system in the
result bytes
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
READ A TRACK
Command Phase
0
MFM
0
0
0
0
1
0
IPS
X
XXXHDDR1
DR0
Track Number
Drive Head Number
Sector Number
Bytes per Sector
End of Track Sector Number
Intersector Gap Length
Data Length
Execution Phase
Data read from disk drive is transferred
to system via DMA or Non-DMA modes
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
RECALIBRATE
Command Phase
000001
1
1
0
0
0
0
0
0
DR1
DR0
Execution Phase
Disk drive head is stepped out to
Track 0
No Result Phase
RELATIVE SEEK
Command Phase
1
DIR
0
0
1
1
1
1
X
X
X
X
X
HD
DR1
DR0
Relative Track Number
Execution Phase
Disk drive head stepped in or out a
programmable number of tracks
No Result Phase
16



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