LPC47M172_07 SMSC [SMSC Corporation], LPC47M172_07 Datasheet - Page 189

• Manufacturer Part Number: LPC47M172_07
• Description: Advanced I/O Controller with Motherboard GLUE Logic
• Manufacturer: SMSC [SMSC Corporation]

11.5
SMSC LPC47M172
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
Logical Device Configuration Registers
The 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.
NAME
Table 11.9 - Floppy Disk Controller Logical Device Configuration Registers
REG INDEX
0xF0 R/W
0xF1 R/W
DATASHEET
Bit[0] Floppy Mode
Bit[1] FDC DMA Mode
= 0
= 1
Bit[3:2] Interface Mode
= 11
= 10
= 01
= 00
Bit[4] FDC_SWAP
0 = Do Not Swap (default)
1 = Swap Drive 0 (nDS, nMTR pins) with Drive 1 (nDS,
nMTR pins)
Bit[5] Reserved, set to zero
Bit[6] FDC Output Type Control
= 0
= 1
Bit[7] FDC Output Control
= 0
= 1
Bit[0] Forced Write Protect
= 0
= 1
bit 1) = (nDS0 AND Forced Write Protect) OR (nDS1
AND Forced Write Protect) OR nWRTPRT (from the
FDD Interface)
Bit[1] Reserved
Bits[3:2] Density Select
= 00
= 01
= 10
= 11
Bit[7:4] Reserved.
= 0
= 1
nWRTPRT (to the FDC Core) = WP (FDC SRA register,
Page 189
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
Inactive (default)
FDD nWRTPRT input is forced active when
either of the drives has been selected.
Normal (default)
Normal (reserved for users)
1 (forced to logic “1”)
0 (forced to logic “0”)
DEFINITION
Advanced I/O Controller with Motherboard GLUE Logic
SMSC/Non-SMSC Register Sets (Rev. 01-11-07)
Datasheet