Read only memory bitline load-balancing
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United States of America Patent
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Oct 28, 2014
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app pub date -
Mar 18, 2013
filing date -
Mar 18, 2013
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Abstract
A Read Only Memory (ROM) bitline cell apparatus and programming method therefore. The programming methodology ensures a ROM structure having open state and/or breaks in the diffusion and/or dummy wordline rows to provide bitline load balancing. The ROM bitline cell apparatus and programming method exhibits improved load balancing for any combination of 1's or all 0's on the bitline. The programming methodology identifies groups of consecutive ‘1’s on the bitline and instead of connecting the ‘1’ devices between BL/BL or GND/GND, those ‘1’ devices can be connected between BL/OPEN, OPEN/BL, GND/OPEN, OPEN/GND or OPEN/OPEN. With little or no variation in bitline loading, timing can be optimized for that single case of bitline loading.
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