參數(shù)資料
型號: 9880
廠商: Intel Corp.
英文描述: Advanced 10/100 Repeater with Intergrated Management
中文描述: 高級10/100中繼器與綜合管理
文件頁數(shù): 61/118頁
文件大?。?/td> 1648K
代理商: 9880
Advanced 10/100 Repeater with Integrated Management
LXT9860/9880
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
61
4.0
Application Information
4.1
General Design Guidelines
Following generally accepted design practices is essential to minimize noise levels on power and
ground planes. Up to 50 mV of noise is considered acceptable. 50 to 80 mV of noise is considered
marginal. High-frequency switching noise can be reduced, and its effects can be eliminated, by
following these simple guidelines throughout the design:
Fill in unused areas of the signal planes with solid copper. Attach them with vias to a VCC or
ground plane that is not located adjacent to the signal layer.
Use ample bulk and decoupling capacitors throughout the design (a .01
μ
F value is
recommended for decoupling caps).
Provide ample power and ground planes.
Provide termination on all high-speed switching signals and clock lines.
Provide impedance matching on long traces to prevent reflections.
Route high-speed signals next to a continuous, unbroken ground plane.
Filter and shield DC-DC converters, oscillators, etc.
Figure 17. Serial Configuration Interface
Figure 18. Serial Configuration Interface Signaling
‘165
CFG_CLK
CFG_DT
CFG_
LD
LXT98x0
CLK
Q
H
SH/
LD
A B C D E F G H
SER
Parallel Config. Data
CFG_
LD
CFG_DT
G = b1
F = b2
E= b3
D = b4
C = b5
B = b6
A = b7
CFG_CLK
100 ns / 10 MHz
H = b0
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