Semiconductor integrated circuit
AssigneeRenesas Electronics Corporation
InventorTeruaki KANZAKI
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to reduce burden on a program for changing an operation mode of an internal circuit in accordance with an internal clock frequency without mounting a large-scale circuit in an LSI in which setting of the frequency of an internal clock can be dynamically changed. In an LSI including an internal clock generation circuit generating an internal clock from a clock source in accordance with a parameter supplied, a register storing frequency information of the clock source, a register storing the parameter, and an internal circuit having a plurality of operation modes, a table circuit controlling the operation mode of the internal circuit in association with the frequency information and the parameter supplied from the registers is provided.
Claims8
A semiconductor integrated circuit comprising:
- an internal clock generation circuit generating an internal clock signal from an outer clock signal;
- a first register coupled to the internal clock generation circuit;
- a table circuit coupled to the first register;
- and
- an internal circuit coupled to the internal clock generation circuit and having a plurality of operation modes,
- wherein the first register stores a first information specifying a relation between an internal clock signal and an outer clock signal,
- wherein the internal clock generation circuit generates the internal clock signal in response to the first information, and
- wherein the table circuit stores control information specifying a relation between a control signal for setting one of the operation modes and the first information, and outputs the control signal in response to the first information.
Dependencies are inferred from the claim text.