Digital delay-locked loop
The present invention is directed to a digital delay-locked loop for digitally controlling a clock signal delay time and saving synchronization information in a register. After intercepting an input clock signal, the digital delay-locked loop utilizes the saved synchronization information in returni...
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Main Author | |
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Format | Patent |
Language | English |
Published |
21.11.2000
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | The present invention is directed to a digital delay-locked loop for digitally controlling a clock signal delay time and saving synchronization information in a register. After intercepting an input clock signal, the digital delay-locked loop utilizes the saved synchronization information in returning to the normal operation, and furthermore, detects a shifted delay by using a trigger pulse generator in order to reduce power consumption during the rapid synchronization of an internal clock signal to an external clock signal, saves a delay state corresponding to a maximum value of half the period of the external clock signal to a lock target rising edge of the internal clock signal, and thus synchronization time and operating time of the digital delay-loop are reduced, which results in reduced operation power for the predetermined time. In addition, even when the external clock signal is suspended, a lock point can be rapidly found and thereby mis-operation because internal clock signals in a circuit are not synchronized to the external clock signal can be minimized. |
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Bibliography: | Application Number: US19980201716 |