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FDC37M81 датащи(PDF) 21 Page - SMSC Corporation

номер детали FDC37M81
подробное описание детали  PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up
PDF  198 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37M81 датащи(HTML) 21 Page - SMSC Corporation

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21
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
TAPE SEL1
(TDR.1)
TAPE SEL0
(TDR.0)
DRIVE
SELECTED
0
0
1
1
0
1
0
1
None
1
2
3
Table 5 - Internal 2 Drive Decode - Normal
DIGITAL OUTPUT
REGISTER
DRIVE SELECT
OUTPUTS (ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 5
Bit 4
Bit1
Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
1
0
0
1
0
nBIT 5
nBIT 4
1
X
0
1
0
1
nBIT 5
nBIT 4
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 5
Bit 4
Bit1
Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
1
0
0
0
1
nBIT 4
nBIT 5
1
X
0
1
1
0
nBIT 4
nBIT 5
0
0
X
X
1
1
nBIT 4
nBIT 5



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