发明名称 |
Programmable logic device macrocell with improved capability |
摘要 |
A macrocell for a programmable logic device includes circuitry for allowing a neighboring macrocell to borrow various numbers of the product terms of the macrocell. The macrocell can continue to make full use of its product terms that are not thus borrowed. This includes logically combining and registering the unborrowed product terms. The macrocell may include circuitry for feeding back to the AND array of the programmable logic device a combinatorial or registered signal of the macrocell, and also outputting such a combinatorial or registered signal from the macrocell. When a combinatorial signal is fed back, the register of the macrocell can be used for another signal of the macrocell.
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申请公布号 |
US5861760(A) |
申请公布日期 |
1999.01.19 |
申请号 |
US19960766512 |
申请日期 |
1996.12.13 |
申请人 |
ALTERA CORPORATION |
发明人 |
PEDERSEN, BRUCE B.;COSTELLO, JOHN C. |
分类号 |
H03K19/173;H03K19/177;(IPC1-7):H03K19/173 |
主分类号 |
H03K19/173 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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