Patent · US Active

Converting SRAM cells to ROM cells

US7920411B2 · kind B2 · utility

3Cited by

7References

16Claims

0Family size

Assignee

Arm Limited · GB

Inventors

Ingming Chang · San Jose, US
Karl L. Wang · Los Altos, US

Key dates

Filing date	Feb 25, 2009
Grant date	Apr 5, 2011
Priority date	—
Expiry date	Jun 12, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG11C17/146
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A method of converting a static random access memory cell to a read only memory cell and the cell thus converted is disclosed. The cell to be converted comprises a data retention portion powered by a higher and lower voltage supply line and four transistors arranged as two cross coupled inverters. It is converted to a read only memory cell by severing a connection between at least one of said transistors within a first of said two inverters and one of said voltage supply lines such that when powered said first inverter outputs a predetermined value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.