Expandable macrocell with reduced set-up time

    公开(公告)号:GB2279830A

    公开(公告)日:1995-01-11

    申请号:GB9413399

    申请日:1994-07-04

    Applicant: ALTERA CORP

    Abstract: A macrocell 100 for use in a programmable logic device (PLD) includes two reprogrammable look-up tables 102, 104 for increased fan-in, and two flip-flops 126, 128 that increases fan-out, thereby doubling logic capability of the PLD without unacceptably increasing device size. The second register 126 can be used for receiving fast input signals 120 form an input to the PLD to reduce setup time. The allocation input and output lines allow cascading of macrocells. Programmable elements 108 - 124 may be implemented by RAM, EPROM, or fuse link memory cells.

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