Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1995-06-06
1998-09-22
Westin, Edward P.
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 40, 326 41, H03K 738, H03K 19177
Patent
active
058119868
ABSTRACT:
A programmable logic device (PLD) cell is used to construct a high density high performance programmable logic device (PLD). The PLD cell includes two programmable logic block cells. The PLD cell also includes an I/O cell and an input macrocell. In addition the PLD cell includes a sub-bank of a programmable output switch matrix bank and a sub-bank of a programmable input switch matrix bank. Each programmable logic block cell includes a multiplicity of product terms. At least one product term in the cluster is programmably available to the cluster. When the product term is disconnected from the cluster, the product term is used for control of the polarity of the logic macrocell output signal or asynchronous functions. Thus, the programmably connectable product term can be used for either synchronous or asynchronous operations. If the programmably connectable and disconnectable product term is connected to the product term cluster, the programmable logic block cell is used for synchronous operations. However, since each product term cluster is associated with a logic macrocell, the logic macrocell can be individually configured for asynchronous operation by simply disconnecting the appropriate product term from the product term cluster and using the product term for the desired asynchronous function. Thus, a single PLD built using the programmable logic block cells supports simultaneously synchronous and asynchronous operations.
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Agrawal Om P.
Ilgenstein Kerry A.
Advanced Micro Devices , Inc.
Kwok Edward C.
Roseen Richard
Westin Edward P.
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