MATLAB XPC TARGET 4 - IO Bedienungsanleitung PDF herunterladen (Seite 43)

PC/104 and PC/104+

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the maximum achievable CPU performance of a PC/104 stack is significantly

lower than that of a desktop PC, rack-mount PC, or CompactPCI system.

Because only a few PC/104+ I/O boards are available, typical PC/104 systems

need to use ISA bus-based I/O boards. This impacts the overall system

performance since the ISA bus has a lower I/O throughput and higher latency

than the PCI bus.

I/O Expandability

Modern CPU boards usually conform to the PC/104+ standard, providing both

ISA and PCI buses for currently available. This limitation makes it very

difficult for you to build a stack that is exclusively made up of boards using the

faster PCI bus. Within a PC/104+ system, you can combine PC/104 (ISA) and

PC/104+ (PCI) boards as long as the PC/104+ boards are stacked onto the CPU

board before the PC/104 boards.

The choice of available PC/104 I/O boards is very broad and covers most I/O

types. The PC/104+ standard defines the expansion of the stack with up to

three PC/104+ (PCI) boards and up to eight PC/104 (ISA) boards. However,

because PC/104 systems are usually used for mobile controller applications,

which do not need a very high number of I/O channels, this limit is rarely

reached.

You can use the following standard I/O board form factors in a PC/104 stack

system:

• PC/104 (ISA)

• PC/104+ (PCI) — If the CPU module is a PC/104+ board

• PMC — Through a passive PC/104+ carrier board

• IP-modules — Through an active PC/104 carrier board

Advantages

The advantages of selecting a PC/104 computer for your target PC are

• Very small, ideal for mobile applications

• Rugged system, well suited for deployment in a harsh environment

• DC power operation

• Extended temperature range operation

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MATLAB XPC TARGET 4 - IO Bedienungsanleitung Seite 43