Semiconductor integrated circuit
First Claim
1. A semiconductor integrated circuit, comprising:
- a memory circuit;
an oscillator circuit which generates an internal clock signal, based on control information stored in the memory circuit; and
a logic circuit which generates control information for causing the frequency of the internal clock signal to coincide with the frequency of an external clock signal generated outside, wherein the internal clock signal is used for a synchronous operation of an internal circuit.
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Accused Products
Abstract
A semiconductor integrated circuit includes a memory circuit, an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit, and a logic circuit which generates control information that causes the frequency of the internal clock signal to coincide with the frequency of an external clock signal. The internal clock signal is used for a synchronous operation of an internal circuit. Even if an error (undesired variation) occurs in the oscillation characteristic of the oscillator circuit due to process variations, it is possible to cause an internal clock signal frequency to coincide with an external clock signal frequency corresponding to a target frequency without the need for external attachment of a crystal oscillator and the input of an external clock signal.
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Citations
29 Claims
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1. A semiconductor integrated circuit, comprising:
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a memory circuit;
an oscillator circuit which generates an internal clock signal, based on control information stored in the memory circuit; and
a logic circuit which generates control information for causing the frequency of the internal clock signal to coincide with the frequency of an external clock signal generated outside, wherein the internal clock signal is used for a synchronous operation of an internal circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 29)
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19. A semiconductor integrated circuit, comprising:
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a memory circuit;
an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit; and
a controller which allows the frequency of the internal clock signal to coincide in the outside, wherein the internal clock signal is used for a synchronous operation of an internal circuit.
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20. A semiconductor integrated circuit, comprising:
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a memory circuit;
an oscillator circuit which generates an internal clock signal, based on control information held in the memory circuit; and
a logic circuit which counts the internal clock signal for each constant interval of a periodically generated pulse and updates the control information in the direction to allow the count value to coincide with an expected value, wherein the internal clock signal is used for a synchronous operation of an internal circuit. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification