FDC37C669-MS Standard Microsystems (SMSC), FDC37C669-MS Datasheet - Page 24

• Manufacturer Part Number: FDC37C669-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C669-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
This register is included for 82077 software compatability.
FDC37C669 does not require its characteristics modified
for tape support. The contents of this register are not
used internal to the device. The TDR is unaffected by a
software reset.
mode.
The
robust
Bit 7
Bit 7
Table 5 - Internal 4 Drive Decode - Normal
X
X
X
X
X
X
1
0
1
0
digital
Bit 6
Bit 6
DIGITAL OUTPUT REGISTER
DIGITAL OUTPUT REGISTER
X
X
X
Bits 2-7 are tri-stated when read in this
X
X
1
X
0
1
0
Table 6 - Internal 4 Drive Decode - Drives 0 and 1 Swapped
Bit 5
Bit 5
data
X
X
X
1
0
X
1
X
X
0
Bit 4
separator
Bit 4
X
X
X
1
0
1
X
X
X
0
Bit1
Bit1
X
0
0
1
1
X
0
0
1
1
used
Bit 0
Bit 0
X
0
1
0
1
X
0
1
0
1
in
nDS3
nDS3
1
1
1
0
1
DRIVE SELECT OUTPUTS
1
1
1
0
1
the
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
24
nDS2
(ACTIVE LOW)
nDS2
1
1
0
1
1
1
1
0
1
1
nDS1
nDS1
0
1
1
1
1
TAPE SEL1
1
0
1
1
1
Table 4- Tape Select Bits
nDS0
0
0
1
1
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
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 4
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 5
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