Invention Grant
- Patent Title: Transition delay test function logic
- Patent Title (中): 转换延迟测试功能逻辑
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Application No.: US12861991Application Date: 2010-08-24
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Publication No.: US08356221B2Publication Date: 2013-01-15
- Inventor: Mark T. Kuo , Michael Howard , Daniel C. Murray
- Applicant: Mark T. Kuo , Michael Howard , Daniel C. Murray
- 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 Lawrence J. Merkel
- Main IPC: G01R31/28
- IPC: G01R31/28

Abstract:
A method and apparatus for conducting transition testing using scan elements are disclosed. In one embodiment, an integrated circuit (IC) includes a scan chain having first and second subsets of scannable flops, the first subset having respective data inputs coupled to a memory array. The scannable flops of the second subset may each have a respective data input coupled to circuitry other than the memory array (e.g., to a logic circuit). The scannable flops of the first subset may be enabled for scan shifting during a transition test mode. The scannable flops of the second subset are inhibited from scanning during the transition test mode. The transition test mode may include at least two functional clock cycles in which the scannable flops of the first subset provide complementary first and second logic values to logic circuits coupled to respective data outputs.
Public/Granted literature
- US20120054568A1 Transition Delay Test Function Logic Public/Granted day:2012-03-01
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