FDC37C666GT View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37C666GT
SMSC -> Microchip
'FDC37C666GT' PDF : 152 Pages View PDF
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. The TDR is unaffected by a
software reset. Bits 2-7 are tri-stated when
read in this mode.
Table 4- Tape Select Bits
DRIVE
TAPE SEL1 TAPE SEL2 SELECTED
0
0
None
0
1
1
1
0
2
1
1
3
Table 5 - Internal 4 Drive Decode - Normal
DIGITAL OUTPUT REGISTER
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7 Bit 6 Bit 5 Bit 4 Bit1 Bit 0 nDS3 nDS2 nDS1 nDS0 nMTR3 nMTR2 nMTR1 nMTR0
X
X
X
1
0
0
1
1
1
0
nBIT 7 nBIT 6 nBIT 5 nBIT 4
X
X
1
X
0
1
1
1
0
1
nBIT 7 nBIT 6 nBIT 5 nBIT 4
X
1
X
X
1
0
1
0
1
1
nBIT 7 nBIT 6 nBIT 5 nBIT 4
1
X
X
X
1
1
0
1
1
1
nBIT 7 nBIT 6 nBIT 5 nBIT 4
0
0
0
0
X
X
1
1
1
1
nBIT 7 nBIT 6 nBIT 5 nBIT 4
Table 6 - Internal 4 Drive Decode - Drives 0 and 1 Swapped
DIGITAL OUTPUT REGISTER
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7 Bit 6 Bit 5 Bit 4 Bit1 Bit 0 nDS3 nDS2 nDS1 nDS0 nMTR3 nMTR2 nMTR1 nMTR0
X
X
X
1
0
0
1
1
0
1
nBIT 7 nBIT 6 nBIT 4 nBIT 5
X
X
1
X
0
1
1
1
1
0
nBIT 7 nBIT 6 nBIT 4 nBIT 5
X
1
X
X
1
0
1
0
1
1
nBIT 7 nBIT 6 nBIT 4 nBIT 5
1
X
X
X
1
1
0
1
1
1
nBIT 7 nBIT 6 nBIT 4 nBIT 5
0
0
0
0
X
X
1
1
1
1
nBIT 7 nBIT 6 nBIT 4 nBIT 5
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