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: 26/116页
文件大小: 1172K
代理商: WJLXT971ALE.A4SE000
LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
Datasheet
17
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
MII Control Interface Pins
D3
3
MDDIS
I
Management Disable. When MDDIS is High, the MDIO is disabled
from read and write operations.
When MDDIS is Low at power-up or reset, the Hardware Control
Interface pins control only the initial or “default” values of their
respective register bits. After the power-up/reset cycle is complete,
bit control reverts to the MDIO serial channel.
E7
43
MDC
I
Management Data Clock. Clock for the MDIO serial data channel.
Maximum frequency is 8 MHz.
D8
42
MDIO
I/O
Management Data Input/Output. Bidirectional serial data channel
for PHY/STA communication.
A1
64
MDINT
OD
Management Data Interrupt. When Register bit 18.1 = 1, an active
Low output on this pin indicates status change. Interrupt is cleared
by reading Register 19.
Table 3. LXT971A Network Interface Signal Descriptions
PBGA
Pin#
LQFP
Pin#
Symbol
Type1
Signal Description
H2
H3
19
20
TPFOP
TPFON
O
Twisted-Pair/Fiber Outputs, Positive & Negative.
During 100BASE-TX or 10BASE-T operation, TPFOP/N pins drive
802.3 compliant pulses onto the line.
During 100BASE-FX operation, TPFOP/N pins produce differential
LVPECL outputs for fiber transceivers.
H4
H5
23
24
TPFIP
TPFIN
I
Twisted-Pair/Fiber Inputs, Positive & Negative.
During 100BASE-TX or 10BASE-T operation, TPFIP/N pins receive
differential 100BASE-TX or 10BASE-T signals from the line.
During 100BASE-FX operation, TPFIP/N pins receive differential
LVPECL inputs from fiber transceivers.
G2
26
SD/TP
I
Signal Detect2: Dual function input depending on the state of the
device.
Reset and Power-Up. Media mode selection:
Tie High for FX mode (Register bit 16.0 = 1)
Tie Low for TP mode (Register bit 16.0 = 0)
Normal Operation (FX Mode): SD input from the fiber transceiver.
Normal Operation (TP Mode): Tie to GND (uses an internal pull-
down).
1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain
2. For standard digital loopback testing (Register bit 0.14) in FX mode, the SD pin should be tied to an
LVPECL logic High (2.4 V).
Table 2. LXT971A MII Signal Descriptions (Continued)
PBGA
Pin#
LQFP
Pin#
Symbol
Type1
Signal Description
1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain
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