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    • 34. 发明授权
    • Address generator employing selective merge of two independent addresses
    • 采用选择性合并两个独立地址的地址生成器
    • US5712999A
    • 1998-01-27
    • US160114
    • 1993-11-30
    • Karl M. GuttagKeith Balmer
    • Karl M. GuttagKeith Balmer
    • G06F9/355G06F12/00G06F15/62
    • G06F9/355
    • An address generator (120) forms a selective merge of two addresses. First (610) and second (620) address units generate respective first and second N bit address. Each unit (610, 620) preferrably includes a set of base address registers (611), a set of index address registers (612) and a full adder (615). Each address unit (610, 620) selects one of the base address registers (611) and one of the index address registers (612) according to the current instruction. The full adder (615) selectively adds the index address to the base address or subtracts the index address from the base addess according to the current instruction. An address multiplexer register (630) stores an N bit multiplex word. An address multiplexer (641) selects for each bit of the merged address from the first or second N bit address depending on the state of the corresponding bit of the multiplex word: An overflow detector (631, 633) generates an overflow signal when either the first address or the second address are beyond a predetermined range. The instruction may specify generation of the address regardless of overflow detection, aborting the address generation upon overflow detection or issuing a processor interrupt upon overflow detection. In the preferred embodiment of this invention, the address unit (120) is embodied in at least one digital image/graphics processor (71, 72, 73, 74) as a part of a multiprocessor (100) formed in a single integrated circuit used in image processing.
    • 地址生成器(120)形成两个地址的选择性合并。 第一(610)和第二(620)地址单元产生相应的第一和第二N位地址。 每个单元(610,620)优选地包括一组基地址寄存器(611),一组索引地址寄存器(612)和全加器(615)。 每个地址单元(610,620)根据当前指令选择一个基地址寄存器(611)和一个索引地址寄存器(612)。 全加器(615)选择性地将索引地址添加到基地址,或者根据当前指令从基地址中减去索引地址。 地址多路复用器寄存器(630)存储N位复用字。 地址多路复用器(641)根据多路复用字的相应位的状态从第一或第二N位地址中选择合并地址的每个位:溢出检测器(631,633)当产生溢出信号时 第一地址或第二地址超出预定范围。 该指令可以指定地址的生成,而不管溢出检测,溢出检测时中断地址生成或溢出检测时发出处理器中断。 在本发明的优选实施例中,地址单元(120)被实现在至少一个数字图像/图形处理器(71,72,73,74)中,作为形成在使用的单个集成电路中的多处理器(100)的一部分 在图像处理中。