82091AA Datasheet, PDF (136/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
Table 24 FDC Command Set (Continued)
Data Bus
Phase R W
D7 D6 D5 D4
D3 D2 D1 D0
Remarks
Sense Interrupt Status
Command W 0
0
0
0
1
0
0
0 Command Codes
Result
R
R
ST 0
PCN
Status Information
at the End of Each
Seek Operation
Specify
Command W 0
W
W
0
0
0
SRT
HLT
0
0
1
1 Command Codes
HUT
ND
Sense Drive Status
Command W 0
0
0
0
0
1
0
0 Command Codes
W0
0
0
0
0 HDS DS1 DS0
Result
R
ST 3
Status Information
About FDD
Drive Specification Command
Command W
W
W
1
0
0
0
0 FD1 FD0 PTS
DN NRP 0
0
1
1
1
DRT1 DRT0 DT1
0
0
0
0 Command Code
DT0
0 – 4 bytes issued
0
Result
R0
0
0 PTS
R0
0
0 PTS
R0
0
0
0
R0
0
0
0
DRT1 DRT0 DT1
DRT1 DRT0 DT1
0
0
0
0
0
0
DT0 Drive 0
DT0 Drive 1
0 RSVD
0 RSVD
Seek
Command W 0
0
0
0
1
1
1
1 Command Codes
W0
0
0
0
0 HDS DS1 DS0
Execution W
NCN
Head is Positioned
Over Proper
Cylinder on Diskette
Configure
Command W 0
0
0
1
0
0
1
W0
0
0
0
0
0
0
W 0 EIA EFIFO POLL
FIFOTHR
W
PRETRK
1 Command Code
0
Relative Seek
Command W 1 DIR
0
0
1
1
1
1 Command Code
W0
0
0
0
0 HDS DS1 DS0
W
RCN
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