
SMSC DS – LPC47M14X 
Page 21 
Rev. 03/19/2001 
6.3 
The following sub-sections specify the implementation of the LPC bus.   
6.3.1 
LPC Interface Signal Definition 
The signals required for the LPC bus interface are described in the table below.  LPC bus signals use PCI 33MHz 
electrical signal characteristics.  
SIGNAL 
NAME 
LAD[3:0] 
I/O 
LPC address/data bus. Multiplexed command, address and data bus. 
LFRAME# 
Input 
Frame signal.  Indicates start of new cycle and termination of broken cycle 
PCI_RESET# 
Input 
PCI Reset.  Used as LPC Interface Reset.  
LDRQ# 
Output 
Encoded DMA/Bus Master request for the LPC interface. 
nIO_PME 
OD 
Power Mgt Event signal.  Allows the LPC47M14x to request wakeup.  
Powerdown Signal.  Indicates that the LPC47M14x should prepare for power to be shut 
on the LPC interface. 
SER_IRQ 
I/O 
Serial IRQ. 
PCI_CLK 
Input 
PCI Clock.   
Note:
 The CLKRUN# signal is not implemented in this part.  
6.3.2 
LPC Cycles 
The following cycle types are supported by the LPC protocol. 
CYCLE TYPE 
I/O Write 
I/O Read 
DMA Write 
DMA Read 
The LPC47M14x
 ignores cycles that  it does not support. 
6.3.3 
Field Definitions 
The data transfers are based on specific fields that are used in various combinations, depending on the cycle type.  
These fields are driven onto the LAD[3:0] signal lines to communicate address, control and data information over the 
LPC bus between the host and the LPC47M14x.  See the “Low Pin Count (LPC) Interface Specification”, 
Revision 
1.0
, Section 4.2 for definition of these fields. 
6.3.4 
LFRAME# Usage 
LFRAME# is used by the host to indicate the start of cycles and the termination of cycles due to an abort or time-out 
condition.  This signal is to be used by the LPC47M14x to know when to monitor the bus for a cycle. 
This signal is used as a general notification that the LAD[3:0] lines contain information relative to the start or stop of a 
cycle, and that the LPC47M14x monitors the bus to determine whether the cycle is intended for it.  The use of 
LFRAME# allows the LPC47M14x to enter a lower power state internally.  There is no need for the LPC47M14x to 
monitor the bus when it is inactive, so it can decouple its state machines from the bus, and internally gate its clocks. 
When the LPC47M14x samples LFRAME# active, it immediately stops driving the LAD[3:0] signal lines on the next 
clock and monitor the bus for new cycle information.  
The LFRAME# signal functions as described in the Low Pin Count (LPC) Interface Specification, Revision 1.0. 
LPC INTERFACE 
TYPE 
DESCRIPTION 
LPCPD# 
Input 
TRANSFER SIZE 
1 Byte 
1 Byte 
1 byte 
1 byte