MATLAB XPC TARGET 4 - IO Instrukcja Użytkownika Pobierz pdf (Strona 41)

PC/104 and PC/104+

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The PC/104 bus connector pins are extended to the top and bottom of the board.

This type of connector pin configuration allows you to connect PC/104 boards

on top of each other, and eliminates the need for a separate backplane. Without

a separate backplane, the system has a smaller physical dimension and a

shape similar to a small tower. This is why a PC/104 system is often called a

PC/104 stack. The PC/104 stack consists of a PC-compatible CPU board, a

power supply board, and additional I/O boards in the same PC/104 form factor.

After the introduction of the PCI bus to the desktop PC, the PC/104 standard

was extended by the PC/104+ standard. The PC/104+ standard adds a

PCI-compatible bus to the form factor. The PCI bus connector is located on the

opposite side of the board to the ISA bus and is extended in the same way.

The physical dimensions of the PC/104 form factor have become a limitation for

CPU boards that use today’s more powerful CPU families and have highly

integrated components (for example, Ethernet controller, FlashRAM, etc.) on

board. This has led to the development of some PC/104 CPU boards that exceed

the physical dimensions defined by the PC/104 standard. These larger boards

are collectively referred to as Single Board Computers (SBCs). One of the

larger boards was standardized by Ampro and Motorola several years ago with

the introduction of the EBX form factor. Since these boards use the PC/104+

bus for I/O expansion, SBC systems function the same way as standard

PC/104+ stacks.

The PC/104 standard includes recommendations for the type and location of

only some I/O connectors. Vendors usually spread the remaining I/O

connectors over the entire surface of the board because of its small size. This

makes it very difficult to purchase an enclosure that has the right I/O connector

breakouts for a specific PC/104 stack. Some vendors offer complete enclosure

kits, but they are usually only compatible with their own boards. This

incompatibility makes it difficult for you to create stacks with PC/104 boards

from multiple vendors. Therefore, if you require an enclosure, it will normally

need to be custom built.

Because of their design, PC/104 systems are rugged and especially suited for

mobile applications in harsh environments. You can use low power, fanless

PC/104 CPU boards in extended temperature range environments where

increased system life cycle is important.

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MATLAB XPC TARGET 4 - IO Instrukcja Użytkownika Strona 41