Kontron VMP3 - Manual (Page 51)

VMP3 Functional Description
ID 29230, Rev. 01 © 2005 Kontron Modular Computers GmbH Page 2 - 17
29230
.01.UG.VC.050727/091426
P R E L I M I N A R Y
2.4.7.1 LPC Interface
One Low Pin Count (LPC) interface for supporting simple IOs, simple static memory devices,
and IO controllers is available via the I/O Expansion interface.
The controller is completely integrated in the BPCC and offers a 8-bit data access port to de-
vices which use LPC IO or memory access protocols. I/O and memory area are selected using
different address spaces.
The I/O address space is 64 kByte in size, whereas the memory area offers 16 MByte address
space. DMA is not supported by this interface.
In addition, a serial IRQ controller is also implemented in the BPCC, controlling and collecting
the serial LPC IRQs and converting and processing them to IRQs for the CPU.
The serial IRQ controller is realized according to the “Serialized IRQ Support for PCI Systems”
Specification, Rev. 6.0, Sept. 1, 1995
The following table provides a listing of the LPC interface signals and a brief description.
2.4.7.2 Terminal Interface
A second serial interface for supporting a terminal port and a low speed communications inter-
face (TERM2) for firmware updating is provided on this connector. This interface is realized us-
ing one of the MPC8541E on-chip UARTs, and, as such, provides only a two wire interface
without hardware handshake signals.
Table 2-13: LPC Interface Signal Description
SIGNAL DESCRIPTION
LAD[0:3] Multiplexed Command, Address, and Data lines
LFRAME# Indicates start of a new cycle, termination of broken cycle
LPCCLK 33 MHz clock
SERIRQ Serialized IRQ, optional for peripherals that need interrupt
Note...
The corresponding serial signals on the VMP3 are TTL logic level signals.
Therefore, the transceivers for RS232 must be provided by the carrier board.
WARNING!
The signal level on the receive lines must not exceed 3.3V. Transients and sig-
nal levels higher than 3.3V may damage the VMP3 board.