MEMORY DEVICE AND CLOCK TRAINING METHOD THEREOF
First Claim
1. A training method comprising:
- providing, at a memory controller, a clock signal to a memory device to synchronize a control signal at a reference time point of the clock signal, in which the clock signal does not transition after the reference time point; and
finding a failure time point at which the memory device fails to sample the control signal at the reference time point of the clock signal, based on the clock signal and the control signal.
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Abstract
A training method for a memory device includes providing, at a memory controller, a clock signal to the memory device to synchronize a control signal at a reference time point of the clock signal. When the clock signal, such as a training clock signal, does not transition after the reference time point, a failure time point is found at which the memory device fails to sample the control signal at the reference time point, based on the clock signal and the control signal. A synchronization time point of the control signal may be set, at which the memory device secures a sampling margin for sampling the control signal at the reference time point, based on the failure time point. A sampler circuit may sample the control signal at an edge of a rising edge of the clock signal.
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Citations
20 Claims
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1. A training method comprising:
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providing, at a memory controller, a clock signal to a memory device to synchronize a control signal at a reference time point of the clock signal, in which the clock signal does not transition after the reference time point; and finding a failure time point at which the memory device fails to sample the control signal at the reference time point of the clock signal, based on the clock signal and the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A memory device comprising:
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a latch including an input buffer configured to receive a control signal from a host; and a sampler configured to sample the control signal provided from the input buffer in synchronization with a clock signal provided from the host; wherein in response to executing a training operation on the memory device that includes synchronization of the control signal at a reference time point of the clock signal, and wherein the clock signal does not transition after the reference time point, the training operation is executed based on a failure time point at which the sampler fails to sample the control signal at the reference time point. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A memory device comprising:
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a clock buffer configured to receive a clock signal from a host, wherein the clock signal does not transition after a reference time point; an input buffer configured to receive a control signal from the host; a sampler configured to sample the control signal provided from the input buffer in synchronization with the reference time point of the clock signal; and a command address latch that receives a command signal and an address signal from the host; a memory cell array in communication with the sampler and the command address latch, the memory cell array configured to store training data; wherein the control signal is synchronized with the clock signal in response to a control signal training operation initiated by the host; and wherein the command signal is synchronized with the clock signal in response to a command signal training operation initiated by the host. - View Dependent Claims (18, 19, 20)
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Specification