IPR-ED8B10B Altera, IPR-ED8B10B Datasheet - Page 3

• Manufacturer Part Number: IPR-ED8B10B
• Description: IP CORE Renewal Of IP-ED8B10B
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IPR-ED8B10B

• Software Application: IP CORE, Interface And Protocols, COMMUNICATION
• Supported Families: Arria GX, Cyclone, HardCopy, Stratix
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: Encoder/Decoder, 8b/10b for Gigabit Ethernet and Fibre Channel
• License: Renewal License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Disparity
Altera Corporation
B
Table 1
Note:
(1)
Disparity is the difference between the number of 1s and 0s in the encoded
word.
I
I
I
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.
For details on running disparity rules, see the IEEE 802.3z specification,
paragraph 36.2.4.4.
Table 1. Character Codes
10-Bit Special K Codes
K28.5 is a comma character used for alignment purposes, and to represent the IDLE
code.
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.
lists the special K codes used by the ED8B10B.
8b10b Encoder/Decoder MegaCore Function (ED8B10B) Data Sheet
K28.5
K28.0
K28.1
K28.2
K28.3
K28.4
K28.6
K28.7
K23.7
K27.7
K29.7
K30.7
(1)
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
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