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1–2
Table 1–2. Device Family Support (Part 2 of 2)
Chapter 1: About This MegaCore Function
Features
Device Family
Cyclone IV E
Cyclone IV GX
Support
Full
Full
HardCopy ?
II
Full
HardCopy III
HardCopy IV E
HardCopy IV GX
Stratix ?
Stratix GX
Stratix II
Stratix II GX
Stratix III
Stratix IV
Other device families
Preliminary
Preliminary
Preliminary
Full
Full
Full
Full
Full
Full
No support
Features
The following list summarizes the features of the 8B10B Encoder/Decoder MegaCore
function:
■
■
■
■
■
■
8b/10b encoding and decoding.
Cascaded encoding and decoding.
Industry compatible special character coding.
Easy-to-use IP MegaWizard ? interface.
Support for OpenCore Plus evaluation.
IP functional simulation models for use in Altera-supported VHDL and Verilog
HDL simulators.
General Description
Encoders and decoders are used for physical layer coding for Gigabit Ethernet, Fibre
Channel, and other applications. The 8b/10b encoder takes byte inputs, and generates
a direct current (DC) balanced stream (equal number of 1s and 0s) with a maximum
run length of 5. Some of the individual 10-bit codes will have an equal number of 1s
and 0s, while others will have either four 1s and six 0s, or, six 1s and four 0s. In the
latter case, the disparity between 1s and 0s is used as an input to the next 10-bit code
generation, so that the disparity can be reversed, and maintain an overall balanced
stream. For this reason, some 8-bit inputs have two valid 10-bit codes, depending on
the input disparity.
The Altera 8B10B Encoder/Decoder is a compact, high performance MegaCore
function capable of encoding and decoding in multi-gigabit applications.
8B10B Encoder/Decoder MegaCore Function User Guide
May 2011 Altera Corporation
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