Inversion encoding
Open-knowledge reference entry
Inversion encoding is an encoding technique used for encoding bus transmissions for low power systems. It is based on the fact that a large amount of power is wasted because of transitions, especially in external buses, and thus reducing these transitions aids optimization of power dissipation. This is done introducing an additional signal line named INV to the bus lines. This signal determines whether the other lines should be inverted or not.
Overview
The bus-invert encoding technique uses an extra signal (INV) to indicate the "polarity" of the data. Having a bus-invert code word INV@x where @ is the concatenation operator and x denotes either the source word or its ones' complement, the bus-invert decoder takes the code word and produces the corresponding source word. If the INV signal is 1, the result is ones' complement of x, otherwise it is x.
Usage scenarios
High capacitance lines
High switching activity
Bus-invert method
The Hamming distance (the number of bits in which they differ) between the present bus value (also counting the present invert line) and the next data value is computed.
If the Hamming distance is larger than n/2, invert is set to 1, and the next bus value is made equal to the inverted next data value.
Otherwise invert is set to 0, and the next bus value is equal to the next data value.
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