Patent ID: 7821816

Claim:
A method of constructing an operational feature Shmoo plot for an SRAM array, comprising: writing data values into SRAM bits in said SRAM array with said SRAM bits biased with safe-write voltages; using operational circuitry to determine a first number of said SRAM bits that fail a first operational feature test at a first measurement point with said SRAM bits biased with a first set of test voltages during a portion of said first operational feature test; repeating additional first operational feature tests with additional sets of test voltages at additional measurement points and determining additional first numbers of SRAM bits that fail at each of said additional measurement points; and constructing said operational feature Shmoo plot by specifying at graph points corresponding to said first measurement point and said additional measurement points said first number and said additional first numbers of said SRAM bits that fail said first operational feature test.