FDC37B78X View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer 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.

DB7

DB6

REG 3F3 Reserved Reserved

DB5

DB4

Drive Type ID

DB3

DB2

DB1

DB0

Floppy Boot Drive tape sel1 tape sel0

TABLE 10 - DRIVE TYPE ID

DIGITAL OUTPUT REGISTER

REGISTER 3F3 - DRIVE TYPE ID

Bit 1

Bit 0

Bit 5

Bit 4

0

0

L0-CRF2 - B1

L0-CRF2 - B0

0

1

L0-CRF2 - B3

L0-CRF2 - B2

1

0

L0-CRF2 - B5

L0-CRF2 - B4

1

1

L0-CRF2 - B7

L0-CRF2 - B6

Note:L0-CRF2-Bx = Logical Device 0, Configuration Register F2, Bit x.

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