37C67X Ver la hoja de datos (PDF) - SMSC -> Microchip

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37C67X

Enhanced Super I/O Controller with Fast IR

SMSC -> Microchip 

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.

REG 3F3

DB7

Media

ID1

DB6

Media

ID0

DB5

DB4

Drive Type ID

DB3

DB2

DB1

DB0

Floppy Boot Drive tape sel1 tape sel0

For this mode, MEDIA_ID[1:0] pins 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 (Pin 19) (See

Table 7)

BIT 6 MEDIA ID 0 READ ONLY (Pin 20) (See

Table 8)

BITS 5 and 4 Drive Type ID - These bits reflect

two of the bits of L0-CRF1. Which two bits

these are depends on the last drive selected in

the Digital Output Register (3F2). (See Table 9)

Note: L0-CRF1-B5 = Logical Device 0,

Configuration Register F1, Bit 5

BITS 3 and 2 Floppy Boot Drive - These bits

reflect the value of L0-CRF1. Bit 3 = L0-CRF1-

B7. Bit 2 = L0-CRF1-B6.

Bits 1 and 0 - Tape Drive Select

(READ/WRITE). Same as in Normal and

Enhanced Floppy Mode 1.

Table 7 - Media ID1

MEDIA ID1

INPUT

BIT 7

Pin 19

L0-CRF1-B5 L0-CRF1-B5

=0

=1

0

0

1

1

1

0

Table 8 - Media ID0

MEDIA ID0

INPUT

Pin 20

BIT 6

CRF1-B4

CRF1-B4

=0

=1

0

0

1

1

1

0

20

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