Apparatus and method of setting operation mode in DLL circuit
First Claim
1. An apparatus for setting an operation mode in a DLL (Delay Locked Loop) circuit configured to generate a locking completion signal according to a level of a phase comparing signal obtained by comparing phases of a reference clock and a feedback clock,wherein during three or more cycles of a pulse signal, it is determined whether a logic value of levels of the phase comparing signal is a specific combination, and the locking completion signal is selectively enabled based thereon.
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Abstract
An apparatus for setting an operation mode in a DLL circuit generates a locking completion signal according to a level of a phase comparing signal obtained by comparing phases of a reference clock and a feedback clock. During three or more cycles of a pulse signal, it is determined whether a logic value of levels of the phase comparing signal is a specific combination, and the locking completion signal is selectively enabled.
12 Citations
34 Claims
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1. An apparatus for setting an operation mode in a DLL (Delay Locked Loop) circuit configured to generate a locking completion signal according to a level of a phase comparing signal obtained by comparing phases of a reference clock and a feedback clock,
wherein during three or more cycles of a pulse signal, it is determined whether a logic value of levels of the phase comparing signal is a specific combination, and the locking completion signal is selectively enabled based thereon.
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3. An apparatus for setting an operation mode in a DLL (Delay Locked Loop) circuit, the apparatus comprising:
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a reset unit configured to control a voltage level of a first node in response to a reset signal; a power supply unit configured to supply a voltage source to a second node in response to a locking completion signal and a pulse signal; a first control unit configured to determine whether a level of a phase comparing signal, which is input during at least three cycles of the pulse signal, is changed, thereby controlling the voltage level of the first node; a second control unit configured to control a voltage level of the second node in response to the phase comparing signal and the pulse signal; and a latch unit configured to latch the voltage applied at the first node, thereby outputting the locking completion signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for setting an operation mode in a DLL (Delay Locked Loop) circuit, the apparatus comprising:
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a reset unit configured to control a voltage level of a first node in response to a reset signal; a power supply unit configured to supply a voltage source to a second node in response to a locking completion signal and a pulse signal; a first control unit configured to include a first flip-flop latching a phase comparing signal according to control of the pulse signal to provide an output signal and a second flip-flop latching the output signal of the first flip-flop according to the control of the pulse signal, and to change, when a logic value of levels of the phase comparing signal input to the first flip-flop is a specific combination, the voltage level of the first node; a second control unit configured to control the voltage level of the second node in response to the phase comparing signal and the pulse signal; and a latch unit configured to latch the voltage level at the first node, thereby outputting the locking completion signal. - View Dependent Claims (16)
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17. An apparatus for setting an operation mode in a DLL (Delay Locked Loop) circuit, the apparatus comprising:
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a reset unit configured to control a voltage level of a first node in response to a reset signal; a power supply unit configured to supply a voltage source to a second node in response to a locking completion signal and a pulse signal; a first control unit configured to controls the voltage of the first node in response to a phase comparing signal and the pulse signal; a second control unit configured to control the voltage level of a second node in response to the phase comparing signal and the pulse signal; an output control unit configured to compare a phase of a reference clock and a phase of a feedback clock, thereby generating an output control signal; and a latch unit configured to latch the voltage at the first node, thereby outputting the locking completion signal according to whether the output control signal is enabled or not. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of setting an operation mode in a DLL (Delay Locked Loop) circuit, the method comprising:
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controlling a voltage level of a voltage applying node in response to a phase comparing signal, a pulse signal, and a locking completion signal; comparing a phase of a reference clock and a phase of a feedback clock, thereby generating an output control signal; and outputting a voltage applied at the voltage applying node as the locking completion signal according to control of the output control signal. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification