LAN9215-MT SMSC, LAN9215-MT Datasheet - Page 64
![CONTROLLER, ENET, NON-PCI, 100TQFP](/photos/19/0/190054/42334689_sml.jpg)
LAN9215-MT
Manufacturer Part Number
LAN9215-MT
Description
CONTROLLER, ENET, NON-PCI, 100TQFP
Manufacturer
SMSC
Specifications of LAN9215-MT
Data Rate
100Mbps
No. Of Ports
2
Ethernet Type
IEEE 802.3 / 802.3u
Supply Current
40mA
Supply Voltage Range
2.97V To 3.63V
Operating Temperature Range
0°C To +70°C
Digital Ic Case Style
TQFP
Interface Type
HBI
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LAN9215-MT
Manufacturer:
BROADCOM
Quantity:
450
Company:
Part Number:
LAN9215-MT
Manufacturer:
Standard
Quantity:
1 643
Company:
Part Number:
LAN9215-MT
Manufacturer:
SMSC
Quantity:
9
Part Number:
LAN9215-MT
Manufacturer:
SMSC
Quantity:
20 000
Revision 1.2 (03-29-06)
4.3
4.3.1
4.3.2
4.3.3
MAC
Converter
Converter
NRZI
The receive data path is shown in
100M Receive Input
The MLT-3 from the cable is fed into the PHY (on inputs RXP and RXN) via a 1:1 ratio transformer.
The ADC samples the incoming differential signal at a rate of 125M samples per second. Using a 64-
level quanitizer it generates 6 digital bits to represent each sample. The DSP adjusts the gain of the
ADC according to the observed signal levels such that the full dynamic range of the ADC can be used.
Equalizer, Baseline Wander Correction and Clock and Data Recovery
The 6 bits from the ADC are fed into the DSP block. The equalizer in the DSP section compensates
for phase and amplitude distortion caused by the physical channel consisting of magnetics, connectors,
and CAT- 5 cable. The equalizer can restore the signal for any good-quality CAT-5 cable between 1m
and 150m.
If the DC content of the signal is such that the low-frequency components fall below the low frequency
pole of the isolation transformer, then the droop characteristics of the transformer will become
significant and Baseline Wander (BLW) on the received signal will result. To prevent corruption of the
received data, the PHY corrects for BLW and can receive the ANSI X3.263-1995 FDDI TP-PMD
defined “killer packet” with no bit errors.
The 100M PLL generates multiple phases of the 125MHz clock. A multiplexer, controlled by the timing
unit of the DSP, selects the optimum phase for sampling the data. This is used as the received
recovered clock. This clock is used to extract the serial data from the received signal.
NRZI and MLT-3 Decoding
The DSP generates the MLT-3 recovered levels that are fed to the MLT-3 converter. The MLT-3 is then
converted to an NRZI data stream.
100Base-TX Receive
A/D
MII 25MHz by 4 bits
RX_CLK
Internal
NRZI
MLT-3
Converter
MLT-3
Magnetics
100M
PLL
Figure 4.2 Receive Data Path
MII
DATASHEET
Figure
MLT-3
125 Mbps Serial
MLT-3
by 4 bits
4.2. Detailed descriptions are given below.
25MHz
64
6 bit Data
RJ45
Highly Efficient 10/100 Ethernet Controller with HP Auto-MDIX
Decoder
4B/5B
and BLW Correction
recovery, Equalizer
MLT-3
DSP: Timing
25MHz by
CAT-5
5 bits
Descrambler
and SIPO
SMSC LAN9215
Datasheet