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PC8477B Scheda tecnica(PDF) 17 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte PC8477B
Spiegazioni elettronici  Advanced Floppy Disk Controller
PDF  54 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC8477B Scheda tecnica(HTML) 17 Page - National Semiconductor (TI)

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40 Command Set Description (Continued)
SCAN EQUAL
Command Phase
MT
MFM
SK
1
0
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
controller is compared to data read from disk
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
SCAN HIGH OR EQUAL
Command Phase
MT
MFM
SK
1
1
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
Sector Step Size
Execution
Phase
Data transferred from system to
controller is compared to data read from disk
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
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
controller is compared to data read from disk
Result Phase
Status Register 0
Status Register 1
Status Register 2
Track Number
Head Number
Sector Number
Bytes per Sector
SEEK
Command Phase
00
0
0
1
1
1
1
X
X
X
X
X
HD
DR1
DR0
New Track Number
MSN of Track Number
0
0
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
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
Third Result Phase byte can only be read if ETR is set in the Mode
Command
17



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