6層與8層板的堆疊方式

基本上盡量讓兩層訊號線中間可以用ground或power隔開
這樣可以避免訊號線的互相干擾

The differnce comparison table of WM5 and WM6 by MS.

Here comes a difference comparison table
Click here to get it. (Badongo)

How to replace DM9161 series.

There are some difference between each version of DM9161 series.
CLick here to download explain documents (Badongo)

Difference between RMII V1.0/V1.2

According to the application note of National Semiconductor, AN-1405, the difference is listed below.

RMII Spec. Revision 1.2
CRS_DV will toggle at the end of a packet to indicate deassertion of CRS.
RMII Spec. revision 1.0
CRS_DV will remain asserted until final data is transferred. CRS_DV will not toggle at the end of a packet.

網路線接頭的接法

1. 通用


2. 古早的

ESD

ESD協會 http://www.esda.org/

內有ESD standard可download

The method to connect 2 Davicom devices without transformers

IC 1	IC 2	Reference Circuit	AVDD_1	AVDD_2
DM9000A	DM9000A	1	2.5V	2.5V
DM9000A	DM9000B	2	2.5V	1.8V
DM9000B	DM9000B	1	1.8V	1.8V
DM9161A	DM9161A	1	2.5V	2.5V
DM9161A	DM9161B	2	2.5V	1.8V
DM9161B	DM9161B	1	1.8V	1.8V

 

Reference Circuit 1

Reference Circuit 2