LPC47M14X datasheet(164/205 Pages) SMSC

164 / 205 page

SMSC DS – LPC47M14X

Page 164

Rev. 03/19/2001

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 or VTR POR (as shown) or the PCI_RESET# signal. These registers are not affected by soft

resets.

Table 68 – Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]

NAME

REG INDEX

DEFINITION

STATE

FDD Mode Register

Default = 0x0E

on VCC POR,

VTR POR and

HARD RESET

0xF0 R/W

Bit[0] Floppy Mode

= 0

Normal Floppy Mode (default)

= 1

Enhanced Floppy Mode 2 (OS2)

Bit[1] FDC DMA Mode

= 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] Reserved

Bit[5] Reserved, set to zero

Bit[6] FDC Output Type Control

= 0

FDC outputs are OD12 open drain (default)

= 1

FDC outputs are O12 push-pull

Bit[7] FDC Output Control

= 0

FDC outputs active (default)

= 1

FDC outputs tri-stated

FDD Option Register

Default = 0x00

on VCC POR,

VTR POR and

HARD RESET

0xF1 R/W

Bit[0] Forced Write Protect

= 0

Inactive (default)

= 1

FDD nWRTPRT input is forced active when

either of the drives has been selected.

nWRTPRT (to the FDC Core) = WP (FDC SRA

OR (nDS1 AND Forced Write Protect) OR nWRTPRT

(from the FDD Interface) OR Floppy Write Protect

Note:

The Floppy Write Protect bit is in the Device

Disable register.

Note:

Boot floppy is always drive 0.

Bit[1] Reserved

Bits[3:2] Density Select

= 00

Normal (default)

= 01

Normal (reserved for users)

= 10

1 (forced to logic "1")

= 11

0 (forced to logic "0")

Bit [7:4] Reserved.

FDD Type Register

Default = 0xFF

on VCC POR,

VTR POR and

HARD RESET

0xF2 R/W

Bits[1:0] Floppy Drive A Type

Bits[3:2] Floppy Drive B Type

Bits[5:4] Reserved (could be used to store Floppy

Drive C type)

Bits[7:6] Reserved (could be used to store Floppy

Drive D type)

Note: The LPC47M14x supports two floppy drives

0xF3 R

Reserved, Read as 0 (read only)

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