- Patent Title: Dynamic tag compare circuits employing P-type field-effect transistor (PFET)-dominant evaluation circuits for reduced evaluation time, and related systems and methods
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Application No.: US14860844Application Date: 2015-09-22
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Publication No.: US09947406B2Publication Date: 2018-04-17
- Inventor: Keith Alan Bowman , Francois Ibrahim Atallah , David Joseph Winston Hansquine , Jihoon Jeong , Hoan Huu Nguyen
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: W&T/Qualcomm
- Main IPC: G11C15/04
- IPC: G11C15/04 ; G11C11/40 ; H03K19/003 ; H03K19/094

Abstract:
Dynamic tag compare circuits employing P-type Field-Effect Transistor (PFET)-dominant evaluation circuits for reduced evaluation time, and thus increased circuit performance, are provided. A dynamic tag compare circuit may be used or provided as part of searchable memory, such as a register file or content-addressable memory (CAM), as non-limiting examples. The dynamic tag compare circuit includes one or more PFET-dominant evaluation circuits comprised of one or more PFETs used as logic to perform a compare logic function. The PFET-dominant evaluation circuits are configured to receive and compare input search data to a tag(s) (e.g., addresses or data) contained in a searchable memory to determine if the input search data is contained in the memory. The PFET-dominant evaluation circuits are configured to control the voltage/value on a dynamic node in the dynamic tag compare circuit based on the evaluation of whether the received input search data is contained in the searchable memory.
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