Semiconductor device including DLL and semiconductor system
First Claim
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1. A semiconductor system comprising:
- a controller configured to output an external clock signal and a command/address signal; and
a semiconductor device including;
a decoding unit configured to decode the command/address signal and generate an input control signal and an output control signal,an initial value setting unit configured to sequentially store code values of a delay control signal in response to the input control signal when a locking signal is enabled, and select one of pre-stored code values of the delay control signal to output an initial value control signal in response to the output control signal, andan internal clock generation unit configured to generate the delay control signal having an initial value that is set based on the initial value control signal, perform a locking operation of generating an internal clock signal by delaying the external clock signal by a predetermined time based on the delay control signal, and output the locking signal and the delay control signal when the locking operation is finished.
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Abstract
A semiconductor system includes: a controller suitable for outputting an external clock signal and a command/address signal; and a semiconductor device suitable for selecting one of pre-stored code values of a delay control signal to output an initial value control signal according to the command/address signal, and outputting an internal clock signal by delaying the external clock signal by a predetermined time based on the delay control signal having an initial value that is set in response to the initial value control signal.
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Citations
15 Claims
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1. A semiconductor system comprising:
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a controller configured to output an external clock signal and a command/address signal; and a semiconductor device including; a decoding unit configured to decode the command/address signal and generate an input control signal and an output control signal, an initial value setting unit configured to sequentially store code values of a delay control signal in response to the input control signal when a locking signal is enabled, and select one of pre-stored code values of the delay control signal to output an initial value control signal in response to the output control signal, and an internal clock generation unit configured to generate the delay control signal having an initial value that is set based on the initial value control signal, perform a locking operation of generating an internal clock signal by delaying the external clock signal by a predetermined time based on the delay control signal, and output the locking signal and the delay control signal when the locking operation is finished. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
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a decoding unit configured to decode a command/address signal and generate an input control signal and an output control signal; an initial value setting unit including a plurality of storages corresponding to bits of the input control signal, and configured to sequentially store code values of a delay control signal in the storages in response to the input control signal when a locking signal is enabled, and select one of the stored code values to output an initial value control signal based on the output control signal; and a delay locked loop (DLL) configured to generate the delay control signal having an initial value that is set based on the initial value control signal, perform a locking operation of generating an internal clock signal by delaying an external clock signal based on the delay control signal, and output the locking signal and the delay control signal when the locking operation is finished. - View Dependent Claims (9, 10, 11, 12)
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13. A semiconductor system comprising:
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a controller configured to output an external clock signal, and an initial value control signal; and a semiconductor device configured to generate a delay control signal having an initial value that is set based on the initial value control signal, and output an internal clock signal by delaying the external clock signal by a predetermined time based on the delay control signal, wherein the controller includes; a processing unit configured to generate an input control signal and an output control signal based on frequency information of the external clock signal; and an initial value setting unit including a plurality of storages corresponding to bits of the input control signal, and configured to receive a locking signal and the delay control signal from the semiconductor device, sequentially store code values of the delay control signal in the storages in response to the input control signal when the locking signal is enabled, and select one of the pre-stored code values to output the initial value control signal based on the output control signal. - View Dependent Claims (14, 15)
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Specification