FDC37C665IR SMSC Corporation, FDC37C665IR Datasheet - Page 26

• Manufacturer Part Number: FDC37C665IR
• Description: 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
• Manufacturer: SMSC Corporation

TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
This register is included for 82077 software
compatability. The robust digital data separator
used in the FDC37C665IR does not require its
characteristics modified for tape support. The
contents of this register are not used internal to
the device.
software reset.
read in this mode.
Bit 7
Bit 7
X
X
X
1
0
X
X
X
1
0
DIGITAL OUTPUT REGISTER
DIGITAL OUTPUT REGISTER
Bit 6
Bit 6
X
X
1
X
0
X
X
1
X
0
Bit 5
Bit 5
The TDR is unaffected by a
X
X
X
X
X
X
1
0
1
0
Bits 2-7 are tri-stated when
Table 6 - Internal 4 Drive Decode - Drives 0 and 1 Swapped
Bit 4
Bit 4
1
X
X
X
0
1
X
X
X
0
Bit1
Bit1
Table 5 - Internal 4 Drive Decode - Normal
X
X
0
0
1
1
0
0
1
1
Bit 0
Bit 0
X
X
0
1
0
1
0
1
0
1
nDS3
DS3
DRIVE SELECT OUTPUTS
1
1
1
0
1
DRIVE SELECT OUTPUTS
1
1
1
0
1
(ACTIVE LOW)
(ACTIVE LOW)
nDS2
nDS2
1
1
0
1
1
1
1
0
1
1
26
nDS1
nDS1
TAPE SEL1
1
0
1
1
1
0
1
1
1
1
0
0
1
1
nDS0
nDS0
0
1
1
1
1
1
0
1
1
1
Table 4- Tape Select Bits
nMTR3
nMTR3
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
TAPE SEL2
MOTOR ON OUTPUTS
MOTOR ON OUTPUTS
0
1
0
1
nMTR2
nMTR2
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
(ACTIVE LOW)
(ACTIVE LOW)
SELECTED
nMTR1
nMTR1
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 4
DRIVE
None
1
2
3
nMTR0
nMTR0
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 5