Macrocell comprised of two look-up tables and two flip-flops
US5399922A · kind A · utility
77Cited by
9References
9Claims
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Assignee
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Key dates
| Filing date | Jul 2, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Jul 2, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/1736
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A macrocell for use in a programmable logic device (PLD) providing for enhanced logic capability and reduced setup time. The preferred embodiment of the macrocell includes two look-up tables, for increased fan-in, and two flip-flops that increase fan-out, thereby doubling logic capability of the PLD without unacceptably increasing device size. Doubling the register count makes this PLD particularly suitable for applications employing high density sequential logic. Furthermore, a second register can be used for receiving fast input signals form an input to the PLD to reduce setup time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.