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US 6,388,910 B1Granted
NOR type mask ROM with an increased data flow rate
AssigneeAMIC Technology (Taiwan) Inc.
InventorChien-Chih Fu
Life of this patent
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Abstract
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.
Claims5
A NOR type mask ROM comprising:
- 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;
- 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;
- a plurality of word lines formed in perpendicular with the main bit lines;
- a plurality of main bank selection lines formed in parallel with the word lines for selecting a memory block;
- and
- a plurality of sub-bank selection lines formed within each memory block for selectively connecting neighboring second and third sub-bit lines so as to select a corresponding sub-bank.
5 more elements
Dependencies are inferred from the claim text.