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FDC37M607 Datasheet(PDF) 18 Page - SMSC Corporation

Part # FDC37M607
Description  ENHANCED SUPER I/O CONTROLLER WITH INFRARED SUPPORT
PDF  182 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37M607 Datasheet(HTML) 18 Page - SMSC Corporation

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18
TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
The Tape Drive Register (TDR) is included for
82077 software compatibility and allows the
user to assign tape support to a particular drive
during initialization.
Any future references to
that drive automatically invokes tape support.
The TDR Tape Select bits TDR [1:0] determine
the tape drive number.
Table 4 illustrates the
Tape Select bit encoding. Note that drive “0” is
the boot device and cannot be assigned tape
support.
The remaining Tape Drive Register
bits TDR.[7:2] are tristated when read. The TDR
is unaffected by a software reset.
Table 4- Tape Select Bits
Table 5 - Internal 2 Drive Decode - Normal
DIGITAL OUTPUT REGISTER
DRIVE SELECT
OUTPUTS (ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7
Bit 6
Bit 5
Bit 4
Bit1
Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
X
X
1
0
0
1
0
nBIT 5
nBIT 4
X
X
1
X
0
1
0
1
nBIT 5
nBIT 4
X
1
X
X
1
0
1
1
nBIT 5
nBIT 4
1
X
X
X
1
1
1
1
nBIT 5
nBIT 4
0
0
0
0
X
X
1
1
nBIT 5
nBIT 4
Table 6 - Internal 2 Drive Decode - Drives 0 and 1 Swapped
DIGITAL OUTPUT REGISTER
DRIVE SELECT
OUTPUTS (ACTIVE
LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7
Bit 6
Bit 5
Bit 4
Bit1
Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
X
X
1
0
0
0
1
nBIT 4
nBIT 5
X
X
1
X
0
1
1
0
nBIT 4
nBIT 5
X
1
X
X
1
0
1
1
nBIT 4
nBIT 5
1
X
X
X
1
1
1
1
nBIT 4
nBIT 5
0
0
0
0
X
X
1
1
nBIT 4
nBIT 5
TAPE SEL1
(TDR.1)
TAPE SEL0
(TDR.0)
DRIVE
SELECTED
0
0
1
1
0
1
0
1
None
1
2
3



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