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    • 3. 发明授权
    • Multiply and accumulate unit (MAC) and method therefor
    • 乘以积累单位(MAC)及其方法
    • US06581086B1
    • 2003-06-17
    • US09488366
    • 2000-01-18
    • Gary R. MorrisonCharles Edward Nuckolls
    • Gary R. MorrisonCharles Edward Nuckolls
    • G06F738
    • G06F13/28
    • A multiply and accumulate (MAC) unit (52) having a multiplier (54) and an adder (56) for providing a calculated result of a MAC operation, an accumulator (58) for storing the calculated result, and a scaler unit (60) for selecting a subset of the calculated result stored in the accumulator. The scaler unit receives information defining the subset as a predetermined number of contiguous bits and defining the location of the bits with respect to a radix point. In response to a detected error in the selection of the subset, the scaler unit selects a second subset, where the second subset also has a predetermined number of contiguous bits having a different location with respect to the radix point:
    • 具有用于提供计算的MAC操作结果的乘法器(54)和加法器(56)的乘法和累加(MAC)单元(52),用于存储计算结果的累加器(58)和缩放器单元 ),用于选择存储在累加器中的计算结果的子集。 缩放器单元接收定义该子集的信息作为预定数量的连续位,并定义相对于小数点的位的位置。 响应于子集选择中的检测到的错误,缩放器单元选择第二子集,其中第二子集还具有相对于小数点具有不同位置的预定数量的连续比特: