| 摘要 |
<p>A system and method is provided for storing a data value by implementation of electrical fuses. Typically, the electrical fuses are provided in a fuse array broken up into a plurality of fuse chains (62, 64, 66) addressable by a control logic circuit (60). The control logic circuit (60) provides control signals for serially loading data values into the chain. Preferably, the control logic circuit (60) also provides control signals for testing and programming of the loaded data values in addition to subsequently reading the loaded data values. A chain can include a plurality of sub-chains (72, 74, 76). Each chain or sub-chain includes optional write protection fuse cells (PP Cell), optional read protection fuse cells (PP Cells) and at least one data fuse cell (F Cell). Preferably, one of the optional write protection fuse cells is located first in the chain or sub-chain and one of the optional read protection fuse cells is located last in the chain or sub-chain. Programming of the optional write protection fuse cell prohibits subsequent programming of the chain or sub-chain, while programming of the optional read protection cell prohibits serial reading of the chain or sub-chain. Additionally, each data cell (F Cell) is provided with an output that is readable by a host system or device in which the chain or sub-chain is integrated. <IMAGE></p> |
