Dual clocked synchronous memory device having a delay time register and method of operating same
First Claim
1. A synchronous memory device having at least one memory section which includes a plurality of memory cells, the memory device comprises:
- a register to store a value which is representative of a delay time after which the memory device responds to a read request;
clock receiver circuitry to receive first and second external clock signals; and
an output driver to output data on a bus in response to a read request and in accordance with the delay time wherein a first portion of the data is output synchronously with respect to the first external clock signal and a second portion of the data is output synchronously with respect to the second external clock signal.
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Abstract
A synchronous memory device having at least one memory section which includes a plurality of memory cells. The memory device comprises a register to store a value which is representative of a delay time after which the memory device responds to a read request and clock receiver circuitry to receive first and second external clock signals. The memory device also includes an output driver(s) to output data on a bus, in response to a read request and in accordance with the delay time, wherein a first portion of the data is output synchronously with respect to the first external clock signal and a second portion of the data is output synchronously with respect to the second external clock signal. The memory device may include a delay locked loop to generate internal clock signal(s) using the external clock signal(s). The output drivers output data on the bus in response to the internal clock signal(s). The memory device may include input receiver circuitry, coupled to the bus, the receive the read request, wherein the read request is sampled from the bus synchronously with respect to the first external clock signal.
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Citations
52 Claims
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1. A synchronous memory device having at least one memory section which includes a plurality of memory cells, the memory device comprises:
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a register to store a value which is representative of a delay time after which the memory device responds to a read request; clock receiver circuitry to receive first and second external clock signals; and an output driver to output data on a bus in response to a read request and in accordance with the delay time wherein a first portion of the data is output synchronously with respect to the first external clock signal and a second portion of the data is output synchronously with respect to the second external clock signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An integrated circuit device having at least one memory section which includes a plurality of memory cells, the integrated circuit device comprises:
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a register to store a value which is representative of a number of cycles of a first external clock signal to transpire after which the memory device responds to a read request; and a plurality of output drivers, each output driver being coupled to an external bus to output data on the external bus after the number of cycles of the first external clock signal have transpired, wherein a first portion of the data is output synchronously with respect to the first external clock signal and a second portion of the data is output synchronously with respect to a second external clock signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of operating a synchronous semiconductor memory device having a register for storing a value which is representative of a time delay after which the memory device responds to a read request and at least one memory section including a plurality of memory cells, the method comprising:
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issuing a read request to the memory device wherein the memory device, in response to the read request, outputs a first portion of the data on a bus in accordance with the time delay and synchronously with respect to a first external clock signal and outputs a second portion of the data, after the first portion of the data, synchronously with respect to a second external clock signal; receiving the first portion of data from the memory device synchronously with respect to the first external clock signal; and receiving a second portion of data from the memory device synchronously with respect to a second external clock signals. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52)
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Specification