LPC47M142-NC Standard Microsystems (SMSC), LPC47M142-NC Datasheet - Page 164
LPC47M142-NC
Manufacturer Part Number
LPC47M142-NC
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LPC47M142-NC.pdf
(205 pages)
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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.
SMSC DS – LPC47M14X
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
Table 68 – Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]
NAME
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
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:
Disable register.
Note:
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 LPC47M14x supports two floppy drives
Reserved, Read as 0 (read only)
= 0
= 1
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
The Floppy Write Protect bit is in the Device
Boot floppy is always drive 0.
Normal (default)
Normal (reserved for users)
1 (forced to logic "1")
0 (forced to logic "0")
Drive C type)
Drive D type)
Page 164
DEFINITION
STATE
C
C
C
C
Rev. 03/19/2001
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