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FDC37C78-HT Datasheet(PDF) 15 Page - Microchip Technology

Part # FDC37C78-HT
Description  Floppy Disk Controller
PDF  82 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78-HT Datasheet(HTML) 15 Page - Microchip Technology

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15
Normal Floppy Mode
Normal mode.
Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are a high
impedance.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3
Tri-state
Tri-state
Tri-state
Tri-state
Tri-state
Tri-state
tape sel1
tape sel0
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3
Media
ID1
Media
ID0
Drive Type ID
Floppy Boot Drive
tape sel1
tape sel0
For this mode, DRATE0 and DRATE1 pins are
inputs, and these inputs are gated into bits 6 and 7
of the 3F3 register.
These two bits are not
affected by a hard or soft reset.
BIT 7 Media ID 1; Read Only (See Table 9a)
BIT 6 Media ID 0; Read Only (See Table 9b)
BITS 5 and 4 Drive Type ID - These Bits reflect
two of the bits of configuration register 6; which
two bits depends on the last drive selected in the
Digital Output Register (3F2). (See Table 11)
BITS 3
and 2
Floppy Boot Drive - These bits
reflect the value of configuration register 7 bits 1,
0. Bit 3 = CR7 Bit DB1. Bit 2 = CR7 Bit DB0.
Bits 1 and 0 - Tape Drive Select (READ/WRITE).
Same as in Normal and Enhanced Floppy Mode.
1.
Table 9a
Media ID1
Pin 26
Bit 7
CR7-DB3=0
CR7-DB3=1
0
0
1
1
1
0
Table 9b
Media ID0
Pin 25
Bit 6
CR7-DB2=0
CR7-DB2=1
0
0
1
1
1
0
Table 9c - Drive Type ID
Digital Output Register
Register 3F3 - Drive Type ID
Bit 1
Bit 0
Bit 5
Bit 4
0
0
CR6 - Bit 1
CR6 - Bit 0
0
1
CR6 - Bit 3
CR6 - Bit 2
1
0
CR6 - Bit 5
CR6 - Bit 4
1
1
CR6 - Bit 7
CR6 - Bit 6



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