Redundancy in RAMs

Virtually everyone agrees that the 200%-2000% yield improvement offered by redundancy makes its acceptance a necessity for the economic viability of RAM manufacturers. But, there is considerable controversy over important short-term issues: Should the 64K DRAM have redundancy? Should fuses be programmed by electrical or laser pulses? Will redundancy have an adverse effect on testability and/or reliability? . . . These and related issues will be assessed by the panelists.