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 

SMSC Defined Logical Device Configuration Registers

The SMSC Specific Logical Device Configuration Registers reset to their default values only on hard

resets generated by Vcc POR or VTR POR or VBAT POR (as shown) or the RESET_DRV signal.

These registers are not affected by soft resets.

TABLE 76 - FLOPPY DISK CONTROLLER, LOGICAL DEVICE 0 [LOGICAL DEVICE NUMBER = 0X00]

NAME

REG INDEX

DEFINITION

STATE

FDD Mode

0xF0 R/W Bit[0] Floppy Mode

C

Register

= 0Normal Floppy Mode (default)

= 1 Enhanced Floppy Mode 2 (OS2)

Default = 0x0E

Bit[1] FDC DMA Mode

on Vcc POR

or Reset_Drv

= 0 Burst Mode is enabled

= 1 Non-Burst Mode (default)

Bit[3:2] Interface Mode

= 11 AT Mode (default)

= 10 (Reserved)

= 01 PS/2

= 00 Model 30

Bit[4] Swap Drives 0,1 Mode

= 0 No swap (default)

= 1 Drive and Motor sel 0 and 1 are swapped.

Bits[5] Reserved, set to zero.

Bit [6] Output Type Control:

0= FDC outputs are OD24 open drain (default)

1= FDC outputs are O24 push-pull.

Bit [7] FDC output Control:

0= FDC outputs active (default)

1= FDC outputs tristated

Note: these bits do not affect the parallel port FDC pins.

FDD Option

0xF1 R/W Bits[1:0] Reserved, set to zero

C

Register

Bits[3:2] Density Select

= 00 Normal (default)

Default = 0x00

= 01 Normal (reserved for users)

on Vcc POR

or Reset_Drv

= 10 1 (forced to logic "1")

= 11 0 (forced to logic "0")

Bit[5:4] Reserved, set to zero

Bits[7:6] Boot Floppy

= 00 FDD 0 (default)

= 01 FDD 1

= 10 Reserved (neither drive A or B is a boot drive).

= 11 Reserved (neither drive A or B is a boot drive).

187

Share Link: