摘要 : This paper presents a source-coding framework for the design ofcoding schemes to reduce transition activity. These schemes are suitedfor high-capacitance buses where the extra power dissipation due to theencoder and decoder circui... 展开 This paper presents a source-coding framework for the design ofcoding schemes to reduce transition activity. These schemes are suitedfor high-capacitance buses where the extra power dissipation due to theencoder and decoder circuitry is offset by the power savings at the bus.In this framework, a data source (characterized in a probabilisticmanner) is first passed through a decorrelating function f1.Next, a variant of entropy coding function f2 is employed,which reduces the transition activity. The framework is then employed toderive novel encoding schemes whereby practical forms for f1and f2 are proposed. Simulation results with an encodingscheme for data buses indicate an average reduction in transitionactivity of 36%. This translates into a reduction in total powerdissipation for bus capacitances greater than 14 pF/b in 1.2 Μm CMOStechnology. For a typical value for bus capacitance of 50 pF/b, there isa 36% reduction in power dissipation and eight times more power savingscompared to existing schemes. Simulation results with an encoding schemefor instruction address buses indicate an average reduction intransition activity by a factor of 1.5 times over known coding schemes 收起