Invention Grant
- Patent Title: Hardware assisted scheme for testing memories using scan
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Application No.: US14714381Application Date: 2015-05-18
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Publication No.: US09892802B1Publication Date: 2018-02-13
- Inventor: Bo Yang , Andrew J. Copperhall , Bibo Li , Vijay M. Bettada
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Agent Erik A. Heter
- Main IPC: G11C29/10
- IPC: G11C29/10 ; G01R31/3177 ; G11C29/50

Abstract:
A hardware assisted scheme for testing IC memories using scan circuitry is disclosed. An IC includes a memory implemented thereon and a chain of serially-coupled scan elements to enable the inputting of test vectors. The scan elements include first and second subsets forming write and read address registers, respectively, a first control flop, and a second control flop. During a launch cycle of a test operation, a first address loaded into the write address register is provided to a write address decoder to effect a write operation. Also responsive to the launch cycle, the first control flop is configured to cause the first address to be provided to the read address register, while the second control flop causes data to be written into the memory. During a capture cycle, the first address is provided to a read address decoder and the second control flop causes a read of data therefrom.
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