FDC37C78-HT datasheet(15/82 Pages) MICROCHIP

15 / 82 page

Normal Floppy Mode

Normal mode.

impedance.

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

REG 3F3

Tri-state

tape sel1

tape sel0

Enhanced Floppy Mode 2 (OS2)

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.

Table 9a

Media ID1

Pin 26

Bit 7

CR7-DB3=0

CR7-DB3=1

Table 9b

Media ID0

Pin 25

Bit 6

CR7-DB2=0

CR7-DB2=1

Table 9c - Drive Type ID

Digital Output Register

Bit 1

Bit 0

Bit 5

Bit 4

CR6 - Bit 1

CR6 - Bit 0

CR6 - Bit 3

CR6 - Bit 2

CR6 - Bit 5

CR6 - Bit 4

CR6 - Bit 7

CR6 - Bit 6

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