Silicon Access Networks, Inc.

Juhan Kim

Hing Wong

A memory architecture is disclosed that employs multiple column redundancies which provide multiple options for replacing a defective global odd or even bit line. Each column memory has two multiplexers, one for selecting a global odd bit line and another for selecting a global even bit line. Two or more column redundancies are coupled to each of the multiplexer in the column memory. In a first embodiment, the global odd and even bit lines are connected through odd and even sense amps in a regular column. In a second embodiment, the global odd bit line in a regular column connects through odd sense amps, while the global even bit line in the regular column connects through even sense amps. In a third embodiment, two or more sets of redundancy columns are commonly coupled to a left adjacent regular column and a right adjacent regular column.

Structure and method of a column redundancy memory

The present invention discloses a parallel test circuit and method for testing even bit line and odd bit line in a memory block simultaneously. The parallel test circuit comprises an even test circuit for testing an even bit line and an odd test circuit for testing an odd bit line. The parallel test circuit also includes a write circuit for writing data to a bit line, a read circuit including a data sense amp, an output buffer, and a comparator. Furthermore, the present invention provides the capability to conduct disturbance test in neighboring even and odd cells.

Growing community of inventors

Cupertino, CA, United States of America

Juhan Kim