Counter control circuit in a burst memory
First Claim
Patent Images
1. A memory device having a plurality of addressable memory elements comprising:
- an address counter to receive a first memory element address and adapted to generate a series of memory element addresses in response to a first transition direction of an address latch signal; and
a buffer circuit to latch the series of memory element addresses in response to a second transition direction of the address latch signal;
the buffer circuit comprises;
a first multiplexer circuit having a first input coupled to an output of the address counter;
a feed back circuit coupled between an output of the first multiplexer circuit and a second input of the first multiplexer circuit; and
a latch circuit interposed between the output of the first multiplexer circuit and the feedback circuit, and adapted to receive an output of the first multiplexer circuit.
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Abstract
An integrated memory circuit is described which can be operated in a burst access mode. The memory circuit includes an address counter which changes column addresses in one of a number of predetermined patterns. The column address is changes in response to a rising edge of a column address signal (CAS*). The memory also includes a buffer circuit which latches the output of the address counter in response to the falling edge of the column address signal. Memory cells are accessed in a burst manner on the falling edge of the column address signal using the address latched in the buffer.
178 Citations
22 Claims
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1. A memory device having a plurality of addressable memory elements comprising:
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an address counter to receive a first memory element address and adapted to generate a series of memory element addresses in response to a first transition direction of an address latch signal; and a buffer circuit to latch the series of memory element addresses in response to a second transition direction of the address latch signal; the buffer circuit comprises; a first multiplexer circuit having a first input coupled to an output of the address counter; a feed back circuit coupled between an output of the first multiplexer circuit and a second input of the first multiplexer circuit; and a latch circuit interposed between the output of the first multiplexer circuit and the feedback circuit, and adapted to receive an output of the first multiplexer circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An integrated memory circuit comprising:
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a memory array having a plurality of addressable memory cells; an address counter to receive a first memory cell address and adapted to generate a series of memory cell addresses in response to a first transition direction of an address latch signal; a buffer circuit coupled to the address counter to latch either the first memory cell address or the series of memory cell addresses in response to a second transition direction of the address latch signal; and access circuitry to access the memory array in response to an address latched in the buffer circuit; the buffer circuit comprises; a first multiplexer circuit having a first input coupled to an output of the address counter; a feed back circuit coupled between an output of the first multiplexer circuit and a second input of the first multiplexer circuit; and a latch circuit interposed between the output of the first multiplexer circuit and the feedback circuit, and adapted to receive an output of the first multiplexer circuit. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of accessing memory elements in a memory device, the method comprising the steps of:
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receiving a first memory element address on address inputs; latching the first memory element address in an address counter; generating a series of memory element addresses with the address counter in response to a first transition direction of an address latch signal; and latching the series of memory element addresses with a buffer circuit in response to a second transition direction of the address latch signal, the step of latching the series of memory element addresses comprises the sub-steps of; coupling the first memory element address to a latch in the buffer circuit via a multiplex circuit, coupling an output of the latch through a feedback circuit and the multiplex circuit to an input of the latch on the first transition direction of the address latch signal, and coupling a subsequent memory element address from the address counter to the input of the latch on the second transition direction of the address latch signal. - View Dependent Claims (17, 18, 19)
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20. A method of accessing memory elements in a memory device, the method comprising the steps of:
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receiving a first memory element address on address inputs; latching the first memory element address in an address counter and a buffer circuit on a first active transition of an address latch signal; generating a series of memory element addresses with the address counter in response to subsequent in-active transitions of the address latch signal; and latching the series of memory element addresses in the buffer circuit in response to active transitions of the address latch signal, the step of latching the series of memory element addresses comprises the sub-steps of; coupling the first memory element address to a latch in the buffer circuit via a multiplex circuit, coupling an output of the latch through a feedback circuit and the multiplex circuit to an input of the latch on the active transition of the address latch signal, and coupling a subsequent memory element address from the address counter to the input of the latch on the inactive transition of the address latch signal. - View Dependent Claims (21, 22)
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Specification