MATLAB XPC TARGET 4 - IO Bedienungsanleitung PDF herunterladen (Seite 33)

Rack-Mount or Industrial PC

2-7

Performance

The CPU boards (SBCs) are usually available with high-performance CPUs

(Intel Pentium III, AMD Athlon) that are similar to those in desktop PCs.

Because the industrial PC has a smaller market and has a special design, the

introduction of boards with the most recent CPU technology is behind that of

the desktop PC market by 6 to 12 months. Modern CPU boards use the PCI bus

for I/O expansion, resulting in the same I/O throughput and latency as the best

desktop PCs.

I/O Expandability

All modern CPU boards (SBCs) extend the ISA and PCI bus to the backplane

through a special slot called PICMG. The PICMG slot combines the ISA and

PCI bus in the same slot (row). The PICMG slot is on the backplane in the

middle of the PCB with the ISA slots on one side and the PCI slots on the other.

Backplanes are available in passive and active versions. The passive versions

offer as many as 20 ISA bus slots and/or up to four free PCI bus slots. Use active

backplanes to overcome the limitation of four PCI bus slots. These backplanes

are equipped with one to several PCI-to-PCI bridges. These bridges include up

to 14 PCI slots and usually have one to three ISA bus slots.

As with desktop PCs, you can use bus expanders to expand the I/O capacity of

the system.

You should use PCI I/O boards for expansion due to their higher throughput,

lower latency, and plug-and-play operation.

The following standard I/O board form factors can be found in rack-mount or

industrial PC computers:

• PCI

• ISA — If the CPU card is of the PICMG type and has a PCI-to-ISA bridge

• PC/104 — Through a passive ISA carrier board

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

• PMC — Through a passive PCI carrier board

• IP-modules — Through an active ISA or PCI carrier board

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MATLAB XPC TARGET 4 - IO Bedienungsanleitung Seite 33