| 摘要 |
The present invention discloses a mask-ROM with reserved space (mask-ROMRS). On its original data-mask, at least one mask-region is reserved for the new contents and contains no patterns. The present invention further discloses a 3-D mask-ROM with reserved memory level(s) (3D-MPROMRL). At least one memory level is reserved for the new contents and not manufactured in the original 3D-MPROMRL. By avoiding mask replacement, the present invention minimizes extra mask cost due to content revision. |
