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FDC37C78-HT Datasheet(PDF) 13 Page - Microchip Technology

No. de pieza FDC37C78-HT
Descripción Electrónicos  Floppy Disk Controller
PDF  82 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78-HT Datasheet(HTML) 13 Page - Microchip Technology

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TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
This register is included for 82077 software
compatability.
The robust digital data separator
used in the FDC37C78 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
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
TAPE SEL1
TAPE SEL2
DRIVE
SELECTED
0
0
1
1
0
1
0
1
None
1
2
3



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