LPC47M112 SMSC Corporation, LPC47M112 Datasheet - Page 167

• Manufacturer Part Number: LPC47M112
• Description: ENHANCED SUPER I/O CONTROLLER WITH LPC INTERFACE
• Manufacturer: SMSC Corporation

Enhanced Super I/O Controller with LPC Interface
Datasheet
Note 1: To allow the selection of the configuration address to a user defined location, these Configuration Address
Note 2: CR22 bit 5 is reset by VTR POR only.
Logical Device Configuration/Control Registers [0x30-0xFF]
Used to access the registers that are assigned to each logical unit. This chip supports eight logical units and has eight
sets of logical device registers. The eight logical devices are Floppy, Parallel, Serial 1, Serial 2, Keyboard Controller,
game port, PME and Serial Port 3. A separate set (bank) of control and configuration registers exists for each logical
device and is selected with the Logical Device # Register (0x07).
The INDEX PORT is used to select a specific logical device register. These registers are then accessed through the
DATA PORT.
The Logical Device registers are accessible only when the device is in the Configuration State. The logical register
addresses are shown in the table below.
SMSC DS – LPC47M112
TEST 4
Default = 0x00, on
VCC POR and
VTR POR
TEST 5
Default = 0x00, on
VCC POR and
VTR POR
TEST 1
Default = 0x00, on
VCC POR and
VTR POR
TEST 2
Default = 0x00, on
VCC POR and
VTR POR
TEST 3
Default = 0x00, on
VCC POR and
VTR POR
Bytes are used. There is no restriction on the address chosen, except that A0 is 0, that is, the address must be
on an even byte boundary. As soon as both bytes are changed, the configuration space is moved to the
specified location with no delay (Note: Write byte 0, then byte 1; writing CR27 changes the base address). The
configuration address is only reset to its default address upon a Hard Reset or VCC POR. The default
configuration address is either 02E or 04E, as specified by the SYSOPT pin.
LOGICAL DEVICE
REGISTER
REGISTER
0x2C R/W
ADDRESS
0x2D R/W
0x2B R/W
0x2E R/W
0x2F R/W
ADDRESS
Table 62 – Logical Device Registers
Test Modes: Reserved for SMSC. Users should not
write to this register, may produce undesired results.
Bit[7] Test Mode: Reserved for SMSC.
should not write to this bit, may produce undesired
results.
Bit[6] 8042 Reset:
1 = Put the 8042 into reset
0 = Take the 8042 out of reset
Bits[5:0] Test Mode: Reserved for SMSC. Users
should not write to this bit, may produce undesired
results.
Test Modes: Reserved for SMSC. Users should not
write to this register, may produce undesired results.
Test Modes: Reserved for SMSC. Users should not
write to this register, may produce undesired results.
Test Modes: Reserved for SMSC. Users should not
write to this register, may produce undesired results.
Page 167
DESCRIPTION
DESCRIPTION
Users
C
STATE
STATE
C
C
C
C
Rev. 02/02/2005