发明名称 |
FLEXIBLE RIPPLE MODE DEVICE IMPLEMENTATION FOR PROGRAMMABLE LOGIC DEVICES |
摘要 |
Various techniques are provided to efficiently implement user designs in programmable logic devices (PLDs). In one example, a programmable logic device (PLD) includes a plurality of programmable logic blocks (PLBs) and a plurality of logic cells within at least one of the PLBs, where each logic cell includes a four input lookup table (4-LUT) configured to provide a 4-LUT output signal to associated carry logic. Each logic cell is configurable according to at least two selectable operational modes including a logic function output mode and a ripple arithmetic output mode, and at least three of the 4-LUT inputs are interchangeable when a selected operational mode comprises the ripple arithmetic output mode. |
申请公布号 |
US2016028400(A1) |
申请公布日期 |
2016.01.28 |
申请号 |
US201514610074 |
申请日期 |
2015.01.30 |
申请人 |
Lattice Semiconductor Corporation |
发明人 |
Sharpe-Geisler Brad;Gunaratna Senani;Yew Ting |
分类号 |
H03K19/177;G06F17/50 |
主分类号 |
H03K19/177 |
代理机构 |
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代理人 |
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主权项 |
1. A programmable logic device (PLD), comprising:
a plurality of programmable logic blocks (PLBs); and a plurality of logic cells within at least one of the PLBs, each logic cell comprising a four input lookup table (4-LUT) configured to provide a 4-LUT output signal to associated carry logic, wherein:
each logic cell is configurable according to at least two selectable operational modes comprising a logic function output mode and a ripple arithmetic output mode; andat least three of the 4-LUT inputs are interchangeable when a selected operational mode comprises the ripple arithmetic output mode. |
地址 |
Hillsboro OR US |