发明申请
- 专利标题: System for retaining state data of an integrated circuit
- 专利标题(中): 用于保持集成电路的状态数据的系统
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申请号: US11821437申请日: 2007-06-22
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公开(公告)号: US20080316850A1公开(公告)日: 2008-12-25
- 发明人: Paul Penzes
- 申请人: Paul Penzes
- 主分类号: G11C14/00
- IPC分类号: G11C14/00
摘要:
According to one embodiment, a system for retaining M bits of state data of an integrated circuit during power down includes M serially coupled scan flip flops divided into M/N groups, where the M scan flip flops are able to save/restore the M bits of state data. Each group contains a merged scan flip flop coupled to a series of scan flip flops. The merged scan flip flop in each of the groups is coupled to a respective read port of a memory unit, and a final scan flip flop in each of the groups is coupled to a respective write port of the memory unit. The system enables the memory unit to save the M bits of state data in N clock cycles. Each merged scan flip flop has a read select input that enables restoring of the state data into the M scan flip flops in N clock cycles.
公开/授权文献
- US07957172B2 System for retaining state data of an integrated circuit 公开/授权日:2011-06-07