參數(shù)資料
型號(hào)： STPCD0175BTI3
廠商： 意法半導(dǎo)體
元件分類： 微處理器
英文描述： PC Compatible Embedded Microprocessor
中文描述： PC兼容嵌入式微處理器
文件頁數(shù)： 45/48頁
文件大?。?/td> 762K
代理商： STPCD0175BTI3
BOARD LAYOUT
Issue 1.7 - February 8, 2000
45/48
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 ormore. 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
ground pad
shielded signal line
ground pad
shielded signal lines
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