PC87322VF Datasheet, PDF (29/84 Pages) National Semiconductor (TI) – Floppy Disk Controller with Dual UARTs, Enhanced Parallel Port, and IDE Interface

4 0 FDC Command Set Description (Continued)
Result Phase
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
Status Register 3
SENSE INTERRUPT
Command Phase
0
0
0
0
1
0
0
0
Execution Phase Status of interrupt is reported
Result Phase
SCAN LOW OR EQUAL
Command Phase
MT MFM SK 1 1
0
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
Sector Step Size
Execution Phase Data transferred from system to control-
ler is compared to data read from disk
Result Phase
Status Register 0
Present Track Number (PTR)
MSN of PTR
0
0
0
0
Note 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 DR1 DR0
New Track Number (PTR)
Execution Phase Internal register is read or written
Result Phase
Value
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
SPECIFY
Command Phase
0
0
0
0
0
Step Rate Time
Motor On Time
0
1
1
Motor Off Time
DMA
Execution Phase Internal registers are written
SEEK
No Result Phase
Command Phase
0
0
0
0
1
1
X
X
X
X
X
HD
New Track Number
MSN of Track Number
0
0
1
DR1
1
DR0
0
0
Note Last Command Phase byte is required only if ETR is set in Mode
Command
Execution Phase Disk drive head is stepped in or out to a
programmable track
No Result Phase
SENSE DRIVE STATUS
Command Phase
0
0
0
0
0
1
0
0
X
X
X
X
X
HD
DR1
DR0
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 Length Sector Count
Execution Phase Data is read from disk but not transferred
to the system
Execution Phase Disk drive status information is detected
and reported
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