6.7.7
6.8 POWER MANAGEMENT ......................................................................................................................................94
6.8.1
6.8.2
6.8.3
6.9
6.9.1
6.9.2
Parallel Port Floppy Disk Controller........................................................................................................92
FDC Power Management .......................................................................................................................94
UART Power Management.....................................................................................................................96
Parallel Port............................................................................................................................................96
REAL TIME CLOCK ............................................................................................................................................97
Configuration Registers ..........................................................................................................................97
Host I/O Interface....................................................................................................................................98
Internal Registers....................................................................................................................................98
Time Calendar and Alarm.......................................................................................................................99
Update Cycle........................................................................................................................................100
Control and Status Registers................................................................................................................100
Interrupts ..............................................................................................................................................103
32kHz Clock Input.................................................................................................................................104
Power Management..............................................................................................................................104
SERIAL IRQ................................................................................................................................................105
Timing Diagrams For SER_IRQ Cycle..............................................................................................105
Routable IRQ To Serial IRQ Conversion Capability..........................................................................107
8042 KEYBOARD CONTROLLER DESCRIPTION................................................................................................108
Keyboard Interface............................................................................................................................108
External Keyboard and Mouse Interface...........................................................................................109
Keyboard Power Management..........................................................................................................110
Interrupts...........................................................................................................................................110
Memory Configurations.....................................................................................................................110
Register Definitions...........................................................................................................................110
External Clock Signal........................................................................................................................111
Default Reset Conditions ..................................................................................................................111
Latches On Keyboard and Mouse IRQs............................................................................................113
6.9.3
6.9.4
6.9.5
6.9.6
6.9.7
6.9.8
6.9.9
6.10
6.10.1
6.10.2
6.11
6.11.1
6.11.2
6.11.3
6.11.4
6.11.5
6.11.6
6.11.7
6.11.8
6.11.9
6.11.10
6.12
6.12.1
6.12.2
6.12.3
6.12.4
6.12.5
6.12.6
6.12.7
6.13
6.14
6.14.1
6.14.2
6.15
6.15.1
6.15.2
6.16
6.16.1
6.16.2
6.17
Keyboard and Mouse PME Generation.............................................................................................114
GENERAL PURPOSE I/O...............................................................................................................................115
GPIO Pins.........................................................................................................................................115
Description........................................................................................................................................116
GPIO Control.....................................................................................................................................118
GPIO Operation ................................................................................................................................119
GPIO PME and SMI Functionality.....................................................................................................120
Either Edge Triggered Interrupts.......................................................................................................121
LED Functionality..............................................................................................................................122
WATCH DOG TIMER.....................................................................................................................................122
POWER ON ELAPSED TIMER (POET)............................................................................................................123
VCC Power on Elapsed Time Counter..............................................................................................123
VTR Power on Elapsed Time Counter ..............................................................................................123
FAN SPEED CONTROL AND MONITORING.......................................................................................................124
Fan Speed Control............................................................................................................................124
Fan Speed Monitoring.......................................................................................................................125
DEVICE DISABLE REGISTER..........................................................................................................................128
Device Disable Register (LPC only)..................................................................................................128
SMBus2 Device Disable Register (SMBus2 only).............................................................................128
SMBUS CONTROLLER .................................................................................................................................129
Configuration Registers.....................................................................................................................129
Runtime Registers.............................................................................................................................129
SMBUS2 SLAVE DEVICE..............................................................................................................................135
SMBus Protocols supported by SMBus2 ..........................................................................................136
Command Codes ..............................................................................................................................136
X-Bus SMBus2/LPC Arbitration.........................................................................................................137
SMBus2 Register Summary..............................................................................................................139
SMBus2 Register Description ...........................................................................................................139
Invalid Command Protocol Response Behavior................................................................................141
Slave Device Time-Out .....................................................................................................................142
Stretching the SCLK Signal...............................................................................................................142
SMBus Timing...................................................................................................................................142
6.17.1
6.17.2
6.18
6.18.1
6.18.2
6.18.3
6.18.4
6.18.5
6.18.6
6.18.7
6.18.8
6.18.9
6.18.10
6.19
6.19.1
6.19.2
Bus Reset Sequence ........................................................................................................................142
X-BUS INTERFACE.......................................................................................................................................143
I/O Cycles .........................................................................................................................................143
Supported LCD Controllers...............................................................................................................146
SMSC LPC47S45x
Page 4 of 259
Rev. 06-01-06
DATASHEET
SMSC [ SMSC CORPORATION ]
