FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 24

• Manufacturer Part Number: FDC37C669_07
• Description: PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support
• 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 FDC37C669 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
Bit 6
Bit 6
DIGITAL OUTPUT REGISTER
DIGITAL OUTPUT REGISTER
X
X
X
X
X
X
1
0
1
0
The TDR is unaffected by a
Bit 5
Bit 5
X
1
X
X
0
X
X
X
1
0
Bits 2-7 are tri-stated when
Table 6 - Internal 4 Drive Decode - Drives 0 and 1 Swapped
Bit 4
Bit 4
X
X
X
1
0
X
X
X
1
0
Table 5 - Internal 4 Drive Decode - Normal
Bit1
Bit1
0
0
1
1
X
X
0
0
1
1
Bit 0
Bit 0
0
1
0
1
X
X
0
1
0
1
nDS3
nDS3
1
1
1
0
1
DRIVE SELECT OUTPUTS
1
1
1
0
1
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
nDS2
24
(ACTIVE LOW)
nDS2
1
1
0
1
1
1
1
0
1
1
TAPE SEL1
nDS1
nDS1
0
1
1
1
1
1
0
1
1
1
0
0
1
1
Table 4- Tape Select Bits
nDS0
nDS0
1
0
1
1
1
0
1
1
1
1
nMTR3
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nMTR3
nBIT 7
nBIT 7
nBIT 7
nBIT 7
nBIT 7
TAPE SEL2
MOTOR ON OUTPUTS
MOTOR ON OUTPUTS
0
1
0
1
nMTR2
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nMTR2
nBIT 6
nBIT 6
nBIT 6
nBIT 6
nBIT 6
(ACTIVE LOW)
(ACTIVE LOW)
nMTR1
nMTR1
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 4
SELECTED
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 5
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