參數(shù)資料
型號: L64381
廠商: LSI Corporation
英文描述: 4-Port Ethernet Controller(四端口以太網(wǎng)控制器)
中文描述: 4端口以太網(wǎng)控制器(四端口以太網(wǎng)控制器)
文件頁數(shù): 44/109頁
文件大小: 815K
代理商: L64381
3-4
Signal Descriptions
DATATN[3:0]
Data Threshold Negative
These pins, along with the DATATP pins, control the CAS-
CADE squelch function and link integrity pulse detection
for their respective port. The DATATN inputs use a differ-
ential comparator that compares the serial data received
from the network with a negative voltage reference.
Input
DATATP[3:0]
Data Threshold Positive
These pins, along with the DATATN pins, control the CAS-
CADE squelch function and link integrity pulse detection
for their respective port. The DATATP inputs compares
the serial data received with a positive voltage reference.
Input
DREF[3:0]
Data Threshold Reference
These inputs are the reference voltages for the DATATN,
DATATP, and DATAI inputs. The internal circuitry is shown
in the following figure:
Input
PREEN[3:0]
Negative Preemphasis
The ports transmit negative preemphasis on these
outputs. These outputs are used in twisted-pair mode
only and control the negative preemphasis output. The
purpose of PREEN is to increase the amplitude of the
higher frequencies in the output signal. Data preempha-
sis guarantees that twisted-pair mode can drive signals
properly at 10 Mbit/s on cable up to 100 meters long.
These signals are resistively combined: DATAP with
PREEP and DATAN with PREEN. The technique of
resistively combining the signals is known as digital
preemphasis.
Output
Port x
DATAIx
DREFx
DATAI
DATATP
DATATN
DATATNx
DATATPx
L64381
+
+
+
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