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DP83843 Datasheet(PDF) 17 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # DP83843
Description  PHYTER
PDF  87 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83843 Datasheet(HTML) 17 Page - National Semiconductor (TI)

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2.0 Functional Description (Continued)
17
www.national.com
Table 2. 4B5B Code-Group Encoding/Decoding
Name
PCS 5B Code-group
MII 4B Nibble Code
DATA CODES
0
11110
0000
1
01001
0001
2
10100
0010
3
10101
0011
4
01010
0100
5
01011
0101
6
01110
0110
7
01111
0111
8
10010
1000
9
10011
1001
A
10110
1010
B
10111
1011
C
11010
1100
D
11011
1101
E
11100
1110
F
11101
1111
IDLE AND CONTROL CODES
H
00100
Halt code-group - Error code
I
11111
Inter-Packet Idle - 0000 (Note 1)
J
11000
First Start of Packet - 0101 (Note 1)
K
10001
Second Start of Packet - 0101 (Note 1)
T
01101
First End of Packet - 0000 (Note 1)
R
00111
Second End of Packet - 0000 (Note 1)
INVALID CODES
V
00000
0110 or 0101 (Note 2)
V
00001
0110 or 0101 (Note 2)
V
00010
0110 or 0101 (Note 2)
V
00011
0110 or 0101 (Note 2)
V
00101
0110 or 0101 (Note 2)
V
00110
0110 or 0101 (Note 2)
V
01000
0110 or 0101 (Note 2)
V
01100
0110 or 0101 (Note 2)
V
10000
0110 or 0101 (Note 2)
V
11001
0110 or 0101 (Note 2)
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. If the CODE_ERR bit in the PCS (bit 3, register address 16h)
is set, the invalid codes are mapped to 5h on RXD[3:0] with RX_ER asserted. Refer to Section 4.14 for further detail.



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