Semiconductor memory device, memory system including the same, and method for adjusting timing between internal clock and command
First Claim
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1. A semiconductor memory device, comprising:
- a detection unit configured to detect a sync pulse at all of rising and falling edges of an internal clock within a single pulse width of the sync pulse, wherein the single pulse width of the sync pulse corresponds to one cycle of the internal clock used in a gear down mode; and
a transfer unit configured to transfer the detection result of the detection unit to a memory controller,wherein the transfer unit comprises;
an operation section configured to perform a logic operation on the detection result of the detection unit,wherein the operation section is configured to generate the operation result which contains information that current internal clock is available if the activation of the sync pulse is detected at the rising edge of the internal clock, and to generate the operation result to delay a command if the activation of the sync pulse is not detected at the rising edge of the internal clock and detected at the falling edge of the internal clock.
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Abstract
A method for adjusting a timing between an internal clock and a command in a gear down mode of a memory device includes detecting a sync pulse at rising and falling edges of the internal clock, and adjusting between the internal clock of the memory device and the command according to the detection result.
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Citations
13 Claims
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1. A semiconductor memory device, comprising:
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a detection unit configured to detect a sync pulse at all of rising and falling edges of an internal clock within a single pulse width of the sync pulse, wherein the single pulse width of the sync pulse corresponds to one cycle of the internal clock used in a gear down mode; and a transfer unit configured to transfer the detection result of the detection unit to a memory controller, wherein the transfer unit comprises; an operation section configured to perform a logic operation on the detection result of the detection unit, wherein the operation section is configured to generate the operation result which contains information that current internal clock is available if the activation of the sync pulse is detected at the rising edge of the internal clock, and to generate the operation result to delay a command if the activation of the sync pulse is not detected at the rising edge of the internal clock and detected at the falling edge of the internal clock. - View Dependent Claims (2, 3, 12)
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4. A memory system, comprising:
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a memory device comprising a detection unit configured to detect a sync pulse at all of rising and falling edges of the internal clock within a single pulse width of the sync pulse, wherein the single pulse width of the sync pulse corresponds to one cycle of the internal clock used in a gear down mode , and a transfer unit configured to transfer a detection result of the detection unit; and a memory controller configured to adjust a timing between an internal clock of the memory device and a command to be applied to the memory device, in response to the detection result transferred from the transfer unit of the memory device, wherein the transfer unit comprises; an operation section configured to perform a logic operation on the detection result of the detection unit, wherein the operation section is configured to generate the operation result which contains information that current internal clock is available if the activation of the sync pulse is detected at the rising edge of the internal clock, and to generate the operation result, wherein the operation result is used to delay the command if the activation of the sync pulse is not detected at the rising edge of the internal clock and detected at the falling edge of the internal clock. - View Dependent Claims (5, 6)
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7. A semiconductor memory device, comprising:
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a detection unit configured to detect a sync pulse at all of rising and falling edges of the internal clock within a single pulse width of the sync pulse, wherein the single pulse width of the sync pulse corresponds to one cycle of the internal clock used in a gear down mode; and an internal clock adjusting unit configured to adjust a timing of the internal clock in response to a detection result of the detection unit, wherein the internal clock adjusting unit comprises; an operation section configured to perform a logic operation on the detection result of the detection unit, wherein the operation section is configured to generate the operation result which contains information that current internal clock is available if the activation of the sync pulse is detected at the rising edge of the internal clock, and to generate the operation result, wherein the operation result is used to delay the command if the activation of the sync pulse is not detected at the rising edge of the internal clock and detected at the falling edge of the internal clock. - View Dependent Claims (8, 9, 10, 11, 13)
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Specification