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    • 5. 发明授权
    • Bus encoding/decoding apparatus and method
    • 总线编码/解码装置及方法
    • US06489900B2
    • 2002-12-03
    • US09749812
    • 2000-12-28
    • Young-soo ShinKi-young ChoiByung-ho MinYoung-hoon Chang
    • Young-soo ShinKi-young ChoiByung-ho MinYoung-hoon Chang
    • H03M700
    • G06F13/4217H03M5/04H04L25/49Y02D10/14Y02D10/151
    • A bus encoding/decoding apparatus and method for a low power digital signal processor (DSP), which uses a narrow data bus, is provided. The apparatus for encoding n bits of data of a data bus, includes a conditional inverting unit for inverting each of (n−1) lower bits of n data when the most significant bit of the n bits of data is 1, a storage unit for storing the last n bits of data which is output to the bus, and a first exclusive OR operating unit for performing a bitwise exclusive OR operation on the lower (n−1) bits or data, which has been inverted by the conditional inverting unit, and the lower (n−1) bits of the n data, which has been stored in the storage unit, wherein the most significant bit of the n bits of data and (n−1) bits of data, which is obtained as the result of the bitwise exclusive OR operation performed by the first exclusive OR operating unit, are output. Accordingly, interface problems with a core and overhead for an additional circuit can be reduced by removing the additional circuit for determining whether to invert data and an extra line, which are used in the conventional BI and BITS coding methods, thereby decreasing the power consumption and the area of a chip.
    • 提供了一种使用窄数据总线的用于低功率数字信号处理器(DSP)的总线编码/解码装置和方法。 用于对数据总线的n位数据进行编码的装置包括条件反转单元,用于当n位数据的最高有效位为1时,将n个数据的(n-1)个较低位反转, 存储输出到总线的最后n位的数据;以及第一异或运算单元,用于对由条件反转单元反相的较低(n-1)位或数据执行逐位异或运算, 和已存储在存储单元中的n个数据的较低(n-1)位,其中作为结果获得的n位数据和(n-1)位数据的最高有效位 输出由第一异或运算部执行的按位异或运算。 因此,可以通过去除用于确定是否反转数据和额外线路的附加电路来减少用于附加电路的核心和开销的接口问题,其用于常规BI和BITS编码方法,从而降低功耗, 芯片的面积。