DP83865-EB National Semiconductor, DP83865-EB Datasheet - Page 56

• Manufacturer Part Number: DP83865-EB
• Description: BOARD EVALUATION DP83865
• Manufacturer: National Semiconductor

Specifications of DP83865-EB

• Main Purpose: Interface, Ethernet
• Utilized Ic / Part: DP83865
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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4.0 Functional Description
dB. The DP83865 uses the PHYADDR[4:0] value to set a
unique seed value for the scramblers. The resulting energy
generated by each channel is out of phase with respect to
each channel, thus reducing the overall electro-magnetic
radiation.
4.7.8 NRZ to NRZI Encoder
After the transmit data stream has been serialized and
scrambled, the data is NRZI encoded to comply with the
TP-PMD standard for 100BASE-TX transmission over Cat-
egory-5 unshielded twisted pair cable. There is no ability to
bypass this block within the DP83865.
(Continued)
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DATA CODES
IDLE AND CONTROL CODES
INVALID CODES
Note 1: Control code-groups I, J, K, T and R in data fields will be
mapped as invalid codes, together with RX_ER asserted.
Note 2: Normally, invalid codes (V) are mapped to 6h on RXD[3:0] with
RX_ER asserted.
Name
Table 52. 4B5B Code-Group Encoding/Decoding
C
D
H
R
A
B
E
F
K
T
V
V
V
V
V
V
V
V
V
V
0
1
2
3
4
5
6
7
8
9
J
I
Code-
group
11110
01001
10100
10101
01010
01011
01110
01111
10010
10011
10110
10111
11010
11011
11100
11101
00100 HALT code-group - Error code
11111 Inter-Packet IDLE - 0000 (Note 1)
11000 First Start of Packet - 0101 (Note 1)
10001 Second Start of Packet - 0101 (Note 1)
01101 First End of Packet - 0000 (Note 1)
00111 Second End of Packet - 0000 (Note 1)
00000 0110 or 0101 (Note 2)
00001 0110 or 0101 (Note 2)
00010 0110 or 0101 (Note 2)
00011 0110 or 0101 (Note 2)
00101 0110 or 0101 (Note 2)
00110 0110 or 0101 (Note 2)
01000 0110 or 0101 (Note 2)
01100 0110 or 0101 (Note 2)
10000 0110 or 0101 (Note 2)
11001 0110 or 0101 (Note 2)
PCS
5B
MII 4B Nibble Code
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111