FDC37C665GT_07 SMSC [SMSC Corporation], FDC37C665GT_07 Datasheet - Page 29

• Manufacturer Part Number: FDC37C665GT_07
• Description: High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
• Manufacturer: SMSC [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 FDC37C665GT 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
X
X
X
1
0
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
X
X
X
X
X
X
1
0
1
0
The TDR is unaffected by a
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
0
0
1
1
X
0
0
1
1
X
Table 5 - Internal 4 Drive Decode - Normal
Bit 0
Bit 0
X
X
0
1
0
1
0
1
0
1
nDS3
nDS3
1
1
1
0
1
1
1
1
0
1
DRIVE SELECT OUTPUTS
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
nDS2
(ACTIVE LOW)
nDS2
1
1
0
1
1
1
1
0
1
1
29
nDS1
nDS1
1
0
1
1
1
0
1
1
1
1
TAPE SEL1
nDS0
nDS0
0
0
1
1
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
nMTR2
nMTR2
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
0
1
0
1
(ACTIVE LOW)
(ACTIVE LOW)
nMTR1
nMTR1
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 4
SELECTED
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