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8b10b Encoder/Decoder MegaCore Function (ED8B10B) Data Sheet
Table 1 lists the special K codes used by the ED8B10B.
Table 1. Character Codes
10-Bit Special K Codes
K28.0
K28.1
K28.2
K28.3
K28.4
K28.5 (1)
K28.6
K28.7
K23.7
K27.7
K29.7
K30.7
Note:
Equivalent 8-Bit Codes
8'b000_11100
8'b001_11100
8'b010_11100
8'b011_11100
8'b100_11100
8'b101_11100
8'b110_11100
8'b111_11100
8'b111_10111
8'b111_11011
8'b111_11101
8'b111_11110
(1)
K28.5 is a comma character used for alignment purposes, and to represent the IDLE
code.
Disparity
Disparity is the difference between the number of 1s and 0s in the encoded
word.
I
I
I
Neutral disparity indicates the number of 1s and 0s are equal.
Positive disparity indicates more 1s than 0s.
Negative disparity indicates more 0s than 1s.
The ED8B10B is designed to maintain a neutral average disparity.
Average disparity determines the DC component of a serial line. Running
disparity is a record of the cumulative disparity of every encoded word,
and is tracked by the encoder. To guarantee neutral average disparity, a
positive running disparity must be followed by neutral or negative
disparity; a negative running disparity must be followed by neutral or
positive disparity. If these conditions are not met, the decoder flags an
error by asserting its rderr output.
B
Altera Corporation
For details on running disparity rules, see the IEEE 802.3z specification,
paragraph 36.2.4.4.
3
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