发明授权
US5701517A Pipelined alignment shifter and method for universal bit field boundary
alignment
失效
流水线对准移位器和通用位域边界对准方法
- 专利标题: Pipelined alignment shifter and method for universal bit field boundary alignment
- 专利标题(中): 流水线对准移位器和通用位域边界对准方法
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申请号: US686479申请日: 1996-07-26
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公开(公告)号: US5701517A公开(公告)日: 1997-12-23
- 发明人: Peter R. Carpenter
- 申请人: Peter R. Carpenter
- 申请人地址: CA Fremont
- 专利权人: Cirrus Logic, Inc.
- 当前专利权人: Cirrus Logic, Inc.
- 当前专利权人地址: CA Fremont
- 主分类号: G06F5/01
- IPC分类号: G06F5/01 ; G06F13/28 ; G06F13/00 ; G06F5/00 ; G06F13/38
摘要:
A pipelined alignment shifter allows transfer of strings of bytes between memories which are non-aligned in computer systems or serial communications and networking with the memories arranged in N fields of B bits, where N and B are integers. The shifter has B copies of N-1 storage elements connected to N copies of N to 1 (N:1) multiplexers. An enable signal E is commonly transmitted to each copy of N-1 storage elements to cause each N-1 storage element, e.g., a latch or a register, to output a previously stored input and to store a corresponding input. A selection signal S indicative of the offset difference between the memories is commonly transmitted to each copy of N:1 multiplexer for realignment of non-aligned boundaries in data transfer mechanisms such as Direct Memory Access (DMA) controllers.