Read only memory devices with independently precharged...

Details Read only memory devices with independently precharged... Read only memory devices with independently precharged...

2006-05-09

2006-05-09

Mai, Son (Department: 2827)

Static information storage and retrieval

Read only systems

Semiconductive

C365S203000

Reexamination Certificate

active

07042750

ABSTRACT:
Read only memory(ROM) integrated circuit devices include a ROM cell block. A plurality of virtual ground lines and bit lines are coupled to the ROM cell block. A precharge circuit, including a virtual ground line precharge controller, virtual ground line precharging unit, bit line precharge controller and bit line precharging unit, independently controls timing of precharging the virtual ground lines and the bit lines. The precharge circuit may be configured to deactivate precharging of the virtual ground lines before deactivating precharging of the bit lines. Precharging of the virtual ground lines may be deactivated substantially concurrently with activation of discharging of the virtual ground lines.

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