参数资料
型号: WJLXT907ALCA4
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: ROHS COMPLIANT, LQFP-64
文件页数: 17/48页
文件大小: 621K
代理商: WJLXT907ALCA4
Intel
LXT901A/907A Universal 3.3 V Ethernet Transceiver
24
Datasheet
Document Number: 249098
Revision Number: 003
Revision Date: 27-Nov-2005
3.4.4
Manual Port Select with Link Test Function
With MD0 tied Low and MD1 tied High, the LXT901A/907A Transceiver logic and framing are
set to Mode 3 (compatible with Fujitsu MB86950 and MB86960, and Seeq 8005 controllers).
Figure 12 shows the setup for Fujitsu controllers. Figure 13 on page 25 shows the four inverters
required to interface with the Seeq 8005 controller. As seen in Figure 9 on page 21 both these
Mode 3 applications show the LI pin tied High, enabling Link Testing; and the STP
(LXT901A Transceiver only) and NTH pins are both tied High, selecting the standard receiver
threshold and 100
Ω termination for unshielded TP cable. However, in these applications
AUTOSEL is tied Low, allowing external port selection through the PAUI pin.
Figure 12. LAN Adapter Board - Manual Port Select with Link Test Function
LX
T901A
/907A
20 MHz
20 pF
CLKI
TXD
TPIN
50
Ω
50
Ω
TPIP
1 : 1
116
14
6
5
4
3
2
1
11
0.1
μF
9
TPONA
TPONB
TPOPB
TPOPA
RJ45
3
6
8
T
o
1
0
BA
SE-
T
W
IS
T
E
D
-
P
A
IR
NE
T
W
O
R
K
1
2
4
5
7
89
10
12
13
15
16
1
2
3
4
5
6
7
8
15
14
13
12
9
10
11
+ 12 V
CIN
CIP
DON
DOP
DIN
DIP
RBIAS
GND2
GND1
TEN
D
-
CO
NNE
CT
O
R
t
o
A
U
IDR
O
P
CA
B
L
E
Chassis
Gnd
Fuse
78
Ω
78
Ω
78
Ω
12.4 k
Ω
TCLK
RCLK
RXD
CD
COL
LBK
PAUI
AUTOSEL
NTH
MD0
MD1
DSQE (907A)
STP (901A)
LI
JAB
PLR
TXD
TEN
TCKN
RCKN
RXD
XCD
LBC
Red
MB86950 or MB86960
BACK-END/
CONTROLLER
INTERFACE
LINE STATUS
1 %
+3.3 V
LEDC/FDE
LEDR
LEDT/PDN
LEDL
VCC1
VCC2
CLKO
330
1 : 2
Green
330
Port Selection
Bias resistor RBIAS should be located close to the pin and isolated from other signals.
TEST
24.9
Ω 1%
24.9
Ω 1%
XCOL
Optional: Centertap capacitor may improve EMC depending on board layout and system design.
2
1
2
1 : 1
0.1
μF
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