參數(shù)資料
型號: DM9000A
廠商: Electronic Theatre Controls, Inc.
英文描述: Ethernet Controller with General Processor Interface
中文描述: 以太網(wǎng)控制器與通用處理器接口
文件頁數(shù): 49/56頁
文件大小: 1744K
代理商: DM9000A
DM9000A
Ethernet Controller with General Processor Interface
Preliminary datasheet
Version: DM9000A-DS-P03
Apr. 21, 2005
49
11. Application Notes
11.1 Network Interface Signal Routing
Place the transformer as close as possible to the RJ-45
connector. Place all the 50 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
11.2 10Base-T/100Base-TX Auto MDIX Application
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.
DM9000A
RXI+
RXI-
TX0+
TX0-
BGGND
BGRES
AUTO MDI-X
Transformer
RJ45
1
2
8
3
4
5
6
7
1:1
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
AVDD_25
9
2
0.1μF
0.1μF
220μF
AGND
Figure 11-1 Auto MDIX Application
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