DM9000A datasheet(52/60 Pages) DAVICOM

부품명	DM9000A

상세설명	Ethernet Controller with General Processor Interface

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제조업체	DAVICOM [Davicom Semiconductor, Inc.]

홈페이지	http://www.davicom.com.tw

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52 / 60 page

DM9000A

Ethernet Controller with General Processor Interface

Final

52

Version: DM9000A-17-DS-F01

May 10, 2006

11. Application Notes

11.1 Network Interface Signal Routing

Place the transformer as close as possible to the RJ-45

connector. Place all the 50Ω resistors as close as possible

to the DM9000A RXI± and TXO± pins. Traces routed

from RXI± and TXO± to the transformer should run in close

pairs directly to the transformer. The designer should be

careful not to cross the transmit and receive pairs. As

always, vias should be avoided as much as possible. The

network interface should be void of any signals other than

the TXO± and RXI± pairs between the RJ-45 to the

transformer and the transformer to the DM9000A.. There

should be no power or ground planes in the area under the

network side of the transformer to include the area under the

RJ-45 connector. (Refer to Figure 11-4 and 11-5) Keep

chassis ground away from all active signals. The RJ-45

connector and any unused pins should be tied to chassis

ground through a resistor divider network and a 2KV bypass

capacitor.

The Band Gap resistor should be placed as physically close

as pins 1 and 48 as possible (refer to Figure 11-1 and 11-2).

The designer should not run any high-speed signal near the

Band Gap resistor placement.

11.2 10Base-T/100Base-TX Auto MDIX Application

DM9000A

RXI+

RXI-

TX0+

TX0-

BGGND

BGRES

AUTO MDI-X

Transformer

RJ45

1

2

8

3

4

5

6

7

1:1

75

1%

2.5V AVCC

0.1µF

0.1µF/2KV

Chasis GND

AGND

3

4

7

8

1

48

AGND

75

1%

75

1%

6.8K

1%

50

1%

50

1%

50

1%

50

1%

AVDD_25

9

2

0.1µF

220µF

AGND

Figure 11-1 Auto MDIX Application

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DM9000A 데이터시트(PDF) 52 Page - Davicom Semiconductor, Inc.

DM9000A 데이터시트(HTML) 52 Page - Davicom Semiconductor, Inc.

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