PC87332VLJ-5 NSC [National Semiconductor], PC87332VLJ-5 Datasheet - Page 54

• 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
RELATIVE SEEK
Command Phase
Execution Phase Disk drive head stepped in or out a pro-
grammable number of tracks
Result Phase None
SCAN EQUAL
Command Phase
Execution Phase Data transferred from system to control-
ler is compared to data read from disk
Result Phase
SCAN HIGH OR EQUAL
Command Phase
Execution Phase Data transferred from system to control-
ler is compared to data read from disk
MT
IPS
MT
IPS
MT
IPS
X
1
DIR
X
MFM
MFM
MFM
X
X
X
X
0
End of Track Sector Number
End of Track Sector Number
SK
SK
SK
X
X
X
Intersector Gap Length
Intersector Gap Length
Drive Head Number
Drive Head Number
Status Register 0
Status Register 1
Status Register 2
Bytes per Sector
Sector Step Size
Bytes per Sector
Bytes per Sector
Sector Step Size
Sector Number
Sector Number
Sector Number
X
0
Track Number
Track Number
Head Number
Track Number
1
X
1
X
1
X
1
X
X
X
X
0
1
1
HD
1
HD
HD
HD
0
1
1
DR1
DR1
DR1
DR1
1
0
0
0
DR0
DR0
DR0
DR0
1
1
1
1
(Continued)
54
Result Phase
SCAN LOW OR EQUAL
Command Phase
Execution Phase Data transferred from system to control-
ler is compared to data read from disk
Result Phase
SEEK
Command Phase
Note The last Command Phase byte is required only if ETR is set in Mode
Execution Phase Disk drive head is stepped in or out to a
programmed track
Result Phase None
IPS
MT
0
X
Command
MSN of Track Number
MFM
0
X
X
End of Track Sector Number
X
0
SK
X
Intersector Gap Length
Drive Head Number
New Track Number
Status Register 0
Status Register 1
Status Register 2
Status Register 0
Status Register 1
Status Register 2
Bytes per Sector
Bytes per Sector
Sector Step Size
Bytes per Sector
Sector Number
Sector Number
Sector Number
Track Number
Track Number
Track Number
Head Number
Head Number
X
0
X
1
X
1
X
1
0
HD
0
HD
1
0
DR1
0
DR1
1
0
DR0
DR0
1
1
0