| 摘要 |
<p>A programmable transistor (21) adjacent to a programmable read only memory. A latch (10) is used in conjunction with the programmable transistor and data is written into the latch (10). If the programmable transistor (21) is programmed the output of the latch (10) will be modified, however, if the programmable transistor (21) is not programmed the output of the latch (10) will not be modified when it is read. The programming pads (26, 27) used to program the programmable transistor (21) are severed (28) so they are no longer functional once the programmable transistor (21) has been programmed. Therefore if someone erases the programmable read only memory the programmable transistor (21) is also erased and cannot be reprogrammed.</p> |
