The "P4X 360 system" is a 6U VMEbus board build around the Motorola MC68EN360 Quad Integrated Communications Controller (QUICC).

It is ideal for low cost embedded real-time monitor, control and server applications.

The usage of the MC68EN360 as intelligent multiple IO controller provides a large offering of interfaces: Ethernet, parallel port, three serial ports configurable as RS232, RS422, second ethernet or Profibus.

The VMEbus interface uses the VIC068A gate array to provide a complete state of the art backplane transmission media.

The combination of the high performance VMEbus and the IO versatility of the QUICC puts low cost features into a high performance single board VMEbus computer.




VMEbus Interface

The "P4X 360 system" VMEbus interface has been optimized for operation in a multiprocessor environment. By using the VIC068A gate array, more than just the standard VMEbus functions are supported. One of these additional features is the message passing mechanism which allows together with the main memory slave capability the efficient implementation of multiprocessor systems.

The VIC068A chip supports all standard data transfer modes of the VMEbus as master and slave interface. Additionally 32 bit block transfer is supported. The write posting feature provides a major relief of the cpu or the bus master. Data that has to be transferred via the VMEbus is buffered in fast latches and, afterwards, transferred without any further interaction of the cpu - any unnecessary cpu cycles are avoided.

The "P4X 360 system" has a software configurable VMEbus interrupter and interrupt handler module. The following parameters may be selected : priority of an interrupt request, and the number and priority of any interrupt request to be handled. This way every possible interrupt structure may be applied, either a distributed or a central interrupt system.

 The board is able to assume all functions of a VMEbus system controller : generation of the system clock, reset function, watchdog timer, iack daisy chain driver, and four level arbitration (single level, priority, round robin).

 Peripheral Interfaces

The communication channels are implemented using the Motorola MC68EN360 / QUICC controller chip.

The QUICC delivers the ethernet / IEEE 802.3 protocol on the first SCC channel. An external manchester encoder is installed on the board.

The "P4X 360 system" offers two different network media interfaces :

The P4X has three serial ports which may configured with different line driver types by means of a serial piggyback module.

Actually five piggyback options are available :

first channel (SCC2) second channel (SCC3) third channel (SCC4) designation
RS232 profibus (isolated RS485) - P4XSP1
RS232 RS232 - P4XSP2 RS232 option
RS232 RS422 - P4XSP2 RS422 option
RS232 RS232 Second Ethernet AUI P4XSP3
RS232 RS232 RS232 P4XSP4


The standard delivery is with two RS232 ports installed.

In order to connect a printer, a centronics compatible parallel interface is provided.

The local asynchronous bus is routed to the mezzanine board expansion connector.

An M-module carrier board can be plugged into this slot to permit the construction of compact controller systems without loading the VMEbus.

 Manufacturing quality

 The SimTech products are manufactured using high quality components. Each board is submitted to a 12 hours burn in.

 Technical specifications

 main cpu

IO processor

Static RAM

Flash memory

Boot eprom

Designation type bit capacity byte capacity
27C010 EPROM 1 M 128 K
27C020 EPROM 2 M 256 K
27C040 EPROM 4 M 512 K
29F010 5 V FLASH 1 M 128 K
29F040 5 V FLASH 4 M 512 K


VMEbus (IEEE STD 1014)


Counters / Timers

Watchdog Timers

Asynchronous serial ports

Profibus port

Parallel Port

Mezzanine Card Slot

Background debug mode (BDM) connector

Board Size

Power Requirements

other frontpanel elements

Backpanel elements (on P4XBP)



Ordering information 

1. P4X base board :

standard configuration :

- 128K boot eprom

- no DRAM

- no SCSI Interface

- VMEbus Interface


- Flash

cpu type cpu speed SRAM size Flash size ordering code
MC68360 25 MHz 2 MByte 2 MByte P4X_360_25_0_2_2

other options on request

- 4,8,16 or 32 Mbyte DRAM

- 512 K or 1 M SRAM

- 512 K, 1 M or 4 M Flash

- SCSI Interface

- board without VMEbus interface 

2. P4X serial piggyback 

standard configuration :

P4XSP2 RS232 option

other options on request :

first channel (SCC2) second channel (SCC3) third channel (SCC4) designation
RS232 profibus (isolated RS485) - P4XSP1
RS232 RS232 - P4XSP2 RS232 option
RS232 RS422 - P4XSP2 RS422 option
RS232 RS232 Second Ethernet AUI P4XSP3
RS232 RS232 RS232 P4XSP4

 Data sheet revision : 1.2