Programmable chip enable logic function
First Claim
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1. A memory circuit arrangement, comprising:
- a first memory device having an array of memory elements, a plurality of inputs and outputs for accessing the memory elements, an input for receiving first and second enable signals from an external source, and programmable circuit means for selectively enabling the first memory device in response to one of said first and second enable signals; and
a second memory device having an array of memory elements, a plurality of inputs and outputs for accessing the memory elements, an input for receiving said first and second enable signals from said external source, and programmable circuit means for selectively enabling the second memory device in response to the other of said first and second enable signals; and
wherein, at least one of the respective outputs of said first and second memory devices are connected together;
wherein said programmable circuit means comprises a logic element having a first input connected to said input for receiving logic level signals from said external source, a second input connected to a reference voltage by a programmable element, and means for programming said programmable element.
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Abstract
A programmable chip enable provides for enabling or disabling an integrated circuit in response to a selected one of a plurality of logic signals. In a specific application, the programmable enable function is used in combination with a plurality of field programmable memory devices. The enable functions of the respective devices are programmed to prevent simultaneous enablement of the memory devices which have their outputs connected together.
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Citations
10 Claims
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1. A memory circuit arrangement, comprising:
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a first memory device having an array of memory elements, a plurality of inputs and outputs for accessing the memory elements, an input for receiving first and second enable signals from an external source, and programmable circuit means for selectively enabling the first memory device in response to one of said first and second enable signals; and a second memory device having an array of memory elements, a plurality of inputs and outputs for accessing the memory elements, an input for receiving said first and second enable signals from said external source, and programmable circuit means for selectively enabling the second memory device in response to the other of said first and second enable signals; and wherein, at least one of the respective outputs of said first and second memory devices are connected together; wherein said programmable circuit means comprises a logic element having a first input connected to said input for receiving logic level signals from said external source, a second input connected to a reference voltage by a programmable element, and means for programming said programmable element. - View Dependent Claims (2, 3, 4)
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5. A field programmable memory device, comprising:
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a first array of memory elements; a second array of memory elements; a plurality of inputs and outputs for accessing the memory elements in each of the arrays; an enable input for receiving first and second enable signals from an external source; and programmable circuit means for selectively enabling the first array of memory elements in response to one of said first and second enable signals and for selectively enabling the second array of memory elements in response to the other of said first and second enable signals; wherein at least one of the respective outputs of the first and second arrays of memory elements are connected together; wherein said programmable circuit means comprises a logic element having a first input connected to said input for receiving logic level signals from said external source, a second input connected to a reference voltage by a programmable element, and means for programming said programmable element. - View Dependent Claims (6, 7, 8)
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9. A memory circuit arrangement, comprising:
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a first memory device having an array of memory elements, a plurality of inputs and outputs for accessing the memory elements, an input for receiving first and second enable signals from an external source, and electrically programmable circuit means for selectively enabling the first memory device in response to one of said first and second enable signals; and a second memory device having an array of memory elements, a plurality of inputs and outputs for accessing the memory elements, an input for receiving said first and second enable signals from said external source, and electrically programmable circuit means for selectively enabling the second memory device in response to the other of said first and second enable signals; and wherein, at least one of the respective outputs of said first and second memory devices are connected together.
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10. A field programmable memory device, comprising:
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a first array of memory elements; a second array of memory elements; a plurality of inputs and outputs for accessing the memory elements in each of the arrays; an enable input for receiving first and second enable signals from an external source; and electrically programmable circuit means for selectively enabling the first array of memory elements in response to one of said first and second enable signals and for selectively enabling the second array of memory elements in response to the other of said first and second enable signals; wherein at least one of the respective outputs of the first and second arrays of memory elements are connected together.
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Specification