STPCI01 查看數據表（PDF） - STMicroelectronics

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STPCI01

PC Compatible Embedded Microprocessor

STMicroelectronics 

BOARD LAYOUT

6.2 HIGH SPEED SIGNALS

Some Interfaces of the STPC run at high speed

and have to be carefully routed or even shielded.

Here is the list of these interfaces, in decreasing

speed order:

- Memory Interface.

- Graphics and video interfaces

- PCI bus

- 14MHz oscillator stage

All the clocks have to be routed first and shielded

for speeds of 27MHz or more. The high speed sig-

nals have the same contrainsts as some of the

memory interface control signals.

The next interfaces to be routed are Memory, Vid-

eo/graphics, and PCI.

All the analog noise sensitive signals have to be

routed in a separate area and hence can be rout-

ed indepedently.

Figure 6-8. Shielding signals

ground ring

shielded signal line

ground pad

ground pad

shielded signal lines

Issue 1.1

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