参数资料
型号: WJLXT971ALE.A4SE000
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: LEAD FREE, LQFP-64
文件页数: 41/116页
文件大小: 1172K
代理商: WJLXT971ALE.A4SE000
LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
30
Datasheet
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
3.4.5
Hardware Configuration Settings
The LXT971A provides a hardware option to set the initial device configuration. The hardware
option uses the three LED driver pins. This provides three control bits, as listed in Table 9. The
LED drivers can operate as either open-drain or open-source circuits as shown in Figure 8.
Figure 8. Hardware Configuration Settings
Table 9. Hardware Configuration Settings
Desired Mode
LED/CFGn
Pin Settings1
Resulting Register Bit Values
Control Register
AN Advertisement Registers
Auto-
Neg
Speed
(Mbps)
Duplex
1
2
3
Auto-
Neg
0.12
Speed
0.13
FD
0.8
100FD
4.8
100TX
4.7
10FD
4.6
10T
4.5
Disabled
10
Half
Low
0
N/A
Auto-Negotiation Adver-
tisement
Full
Low
High
1
100
Half
Low
High
Low
1
0
Full
Low
High
1
Enabled
100
Only
Half
High
Low
11
00
1
0
Full
High
Low
High
1
0
10/100
Half
Only
High
Low
0
1
0
1
Full or
Half
High
1
1. Refer to Table 7 on page 19 for LED/CFG pin assignments.
Configuration Bit = 1
Configuration Bit = 0
LED/CFG Pin
3.3 V
1. The LED/CFG pins automatically adjust their
polarity upon power-up or reset.
2. Unused LEDs may be implemented with pull-up/
pull-down resistors of 10 K.
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