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STPC0366BTI3 数据表(PDF) 47 Page - STMicroelectronics |
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STPC0366BTI3 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 51 page  BOARD LAYOUT 47/51 Issue 1.2 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 ground pad shielded signal line ground pad shielded signal lines |
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