LPC47M112_07 SMSC [SMSC Corporation], LPC47M112_07 Datasheet - Page 169

• Manufacturer Part Number: LPC47M112_07
• Description: Enhanced Super I/O Controller with LPC Interface
• Manufacturer: SMSC [SMSC Corporation]

Enhanced Super I/O Controller with LPC Interface
Datasheet
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 nPCI_RESET signal. These registers are not affected by soft
resets.
SMSC DS – LPC47M112
FDD Mode Register
Default = 0x0E
on VCC POR,
VTR POR and
HARD RESET
FDD Option Register
Default = 0x00
on VCC POR,
VTR POR and
HARD RESET
FDD Type Register
Default = 0xFF
on VCC POR,
VTR POR and
HARD RESET
NAME
Table 66 - Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]
REG INDEX
0xF0 R/W
0xF1 R/W
0xF2 R/W
0xF3 R
Bit[0] Floppy Mode
Bit[1] FDC DMA Mode
= 0
= 1
Bit[3:2] Interface Mode
= 11
= 10
= 01
= 00
Bit[4] Reserved
Bit[5] Reserved, set to zero
Bit[6] FDC Output Type Control
= 0
= 1
Bit[7] FDC Output Control
= 0
= 1
Note: Bits 6 & 7 do not affect the parallel port FDC
pins.
Bit[0] Forced Write Protect
= 0
= 1
nWRTPRT (to the FDC Core) = WP (FDC SRA
register, bit 1) = (nDS0 AND Forced Write Protect)
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.
Note: the Force Write Protect bit also applies to the
Bit[1] Reserved
Bits[3:2] Density Select
= 00
= 01
= 10
= 11
Bit[7:4] Reserved.
Bits[1:0] Floppy Drive A Type
Bits[3:2] Floppy Drive B Type
Bits[5:4] Reserved (could be used to store Floppy
Bits[7:6] Reserved (could be used to store Floppy
Note: The LPC47M112 supports two floppy drives
Reserved, Read as 0 (read only)
DATASHEET
= 0
= 1
Parallel Port FDC.
Inactive (default)
either of the drives has been selected.
FDD nWRTPRT input is forced active when
Normal Floppy Mode (default)
Enhanced Floppy Mode 2 (OS2)
Burst Mode is enabled
Non-Burst Mode (default)
AT Mode (default)
(Reserved)
PS/2
Model 30
FDC outputs are OD12 open drain (default)
FDC outputs are O12 push-pull
FDC outputs active (default)
FDC outputs tri-stated
Normal (default)
Normal (reserved for users)
1 (forced to logic "1")
0 (forced to logic "0")
Drive C type)
Drive D type)
Page 169
DEFINITION
STATE
C
C
C
C
Rev. 02-16-07