IT8712F Datasheet, PDF (120/189 Pages) List of Unclassifed Manufacturers – Environment Control -Low Pin Count Input / Output(EC - LPC I/O)

IT8712F
Symbol
ST0
ST1
ST2
ST3
STP
Command Set Symbol Descriptions [cont’d]
Description
Status 0
Status 1
Status 2
Status 3
ST0−3 stand for one of four registers that store the status information after a command has been
executed. This information is available during the Result phase after command execution. These
registers should not be confused with the Main Status Register (selected by A₀ = 0). ST0−3 may
be read only after a command has been executed and contain information associated with that
particular command.
If STP = 1 during a SCAN operation, the data in contiguous sectors are compared byte by byte
with data sent from the processor (or DMA). If STP = 2, alternate sectors are read and compared.
Phase R/W _D7
Command W MT
W
0
W
W
W
W
W
W
W
Execution
Result R
R
R
R
R
R
R
D6
MFM
0
Table 9-15. Command Set Summary
READ DATA
Data Bus
D5 D4 D3 D2 D1 D0
SK
0
0
1
1
0
0
0
0
HDS DR1 DR0
C
H
R
N
EOT
GPL
DTL
ST0
ST1
ST2
C
H
R
N
Remarks
Command Codes
Sector ID information before the
command execution
Data transfer between the FDD and
the main system
Status information after command
execution
Sector ID information after command
execution
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IT8712F V0.81