Patent ID: 7089136
Filing Date: 2006-08-08
Classification: G11C

Abstract:
1. A circuit for programming and testing electrical fuse (eFuse) circuits in a device, said circuit comprising: an eFuse circuit that includes a fuse, a blow device, and a control input for said blow device; first logic means for determining when to blow said fuse, wherein said first logic means comprises: second logic means for triggering a bypass of a pre-blow process within said eFuse circuit when said fuse is not to be blown, wherein a shifted 1 propagating through a plurality of eFuse circuits within said device is passed to a next downstream eFuse circuit without delay attributable to said pre-blow process; wherein said second logic means comprises: third logic means for maintaining the EFUSEPROGRAM signal in a logic low state during serial readout of fuse latches within a shift path, such that the MUX is forced to choose the input from a fuse latch of the circuit and the fuse latch is forced to be within the shift path regardless of the state of the pattern latch.