DP83815DVNG National Semiconductor, DP83815DVNG Datasheet - Page 22

• Manufacturer Part Number: DP83815DVNG
• Description: IC, ENET CTRL 10BASET, 100MBPS, LQFP-144
• Manufacturer: National Semiconductor

Specifications of DP83815DVNG

• Data Rate: 100Mbps
• Ethernet Type: 10BASE-T
• Supply Current: 170mA
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 144
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Subject to change without notice.
3.0 Functional Description
3.9.3 NRZ to NRZI Encoder
After the transmit data stream has been serialized and
scrambled, the data must be NRZI encoded in order to
comply with the TP-PMD standard for 100BASE-TX
transmission over Category-5 un-shielded twisted pair
cable. There is no ability to bypass this block within the
DP83815.
binary_in
DATA CODES
IDLE AND CONTROL CODES
Name
C
D
H
R
A
B
E
F
K
T
0
1
2
3
4
5
6
7
8
9
J
I
D
Table 3-1 4B5B Code-Group Encoding/Decoding
Q
Q
PCS 5B Code-group
(Continued)
Figure 3-7 Binary to MLT-3 conversion
11110
01001
10100
10101
01010
01011
01110
01111
10010
10011
10110
10111
11010
11011
11100
11101
00100
11111
11000
10001
01101
00111
differential MLT-3
binary_minus
binary_plus
binary_in
22
3.9.4 Binary to MLT-3 Convertor / Common Driver
The Binary to MLT-3 conversion is accomplished by
converting the serial binary data stream output from the
NRZI encoder into two binary data streams with alternately
phased logic one events. These two binary streams are
then fed to the twisted pair output driver which converts the
voltage to current and alternately drives either side of the
transmit transformer primary winding, resulting in a minimal
current (20 mA max) MLT-3 signal. Refer to Figure 3-7
binary_minus
binary_plus
HALT code-group - Error code
Second Start of Packet - 0101
Second End of Packet - 0000
First Start of Packet - 0101
First End of Packet - 0000
Inter-Packet IDLE - 0000
Description/4B Value
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
COMMON
DRIVER
Rev O
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MLT-3