MATLAB XPC TARGET 4 - IO Manuale Utente Scaricare il pdf (Pagina 29)

Desktop PC

2-3

Performance

As the impact of the CPU cost on the entire configuration is small, we

recommend you use the highest performance CPU architecture with the

highest clock rate available. Select a desktop PC with either an Intel Pentium

III or an AMD Athlon CPU. We recommend the Pentium III over the Pentium

4 as the CPU for a target PC running the xPC Target kernel. According to our

benchmarks, the Pentium 4 architecture seems to be less effective for

floating-point intensive applications.

All modern desktop PCs use the PCI bus for expansion purposes. This bus has

the fastest I/O throughput and lowest latency available in a PC-compatible

system.

I/O Expandability

Modern desktop PCs have a mainboard (motherboard) that normally has three

to five PCI bus slots available for expansion with PCI I/O boards. Very few offer

the older-style ISA bus slots. Those that have ISA bus slots use a PCI-to-ISA

bridge. If more slots are required for I/O boards, then you can use a bus

expander. A bus expander consists of a PCI (or ISA) board that is plugged into

the desktop PC. This board has a copper or fiber-optical connection to an

external chassis (usually a rack-mount system) with a passive backplane and

up to 14 PCI or ISA slots. You need at least one ISA or PCI slot available in the

desktop PC to have ISA or PCI bus expansion.

An alternative to using bus expanders would be to switch to the rack-mount or

industrial PC form factor.

If possible, you should use PCI I/O boards because of their higher throughput,

lower latency, and ease of operation.

You can use the following standard I/O board form factors with a desktop PC:

• PCI

• ISA — If mainboard is equipped with 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 Manuale Utente Pagina 29