| 摘要 |
A NOR type mask ROM includes a plurality of main bit lines formed in parallel with each other, a plurality of first sub-bit lines connected to the main bit lines through bit line contacts, a plurality of T-shaped second sub-bit lines each having a vertical arm formed in parallel with the main bit lines, and a horizontal arm formed in perpendicular with the vertical arm, and a plurality of third sub-bit lines each formed in parallel with the main bit lines and between vertical arms of two neighboring second sub-bit lines.
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