Title:
CLOCK GENERATING CIRCUIT AND SEMICONDUCTOR DEVICE
Document Type and Number:
Japanese Patent JP3690899
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the circuit scale of a clock generating circuit without changing any adjusting unit when precisely adjusted clocks are generated from one clock in a very small adjusting unit.
SOLUTION: When a clock generating circuit generates a plurality of clocks FCLK adjusted to the optimum phase at every one of a plurality of objects based on a received clock CLK, the circuit is provided with a first DLL circuit 21 which outputs a roughly adjusted clock RCLK by adjusting the delaying amount of the received clock CLK and a plurality of second DLL circuits 22-0 to 22-n which are respectively provided for each object and output a plurality of clocks FCLK by adjusting stepwise the delaying amount of the roughly adjusted clock RCLK. The first DLL circuit 21 changes the phase adjusting amount by discriminating whether the clock RCLK leads or lags the optimum phase within a prescribed phase difference and the second DLL circuits 22-0 to 22-n change the phase adjusting amount by discriminating whether the plurality of clocks FCLK lead or lag the optimum phase.
More Like This:
JPH06103762 | INTERNAL VOLTAGE GENERATING DEVICE FOR DRAM |
JPH06343260 | CHARGE PUMP CIRCUIT |
JPH11202958 | VOLTAGE GENERATING CIRCUIT |
Inventors:
Shinya Fujioka
Application Number:
JP14244197A
Publication Date:
August 31, 2005
Filing Date:
May 30, 1997
Export Citation:
Assignee:
富士通株式会社
International Classes:
G11C11/407; G06F1/10; G06F1/12; G06F13/42; G11C11/401; G11C11/4076; H03K5/13; H03K5/15; H03K19/0175; H03L7/081; H03L7/087; (IPC1-7): H03K19/0175; G06F1/10; G06F1/12; G06F13/42; G11C11/407; H03K5/13; H03K5/15
Domestic Patent References:
JP8097715A | ||||
JP6097788A | ||||
JP5100768A | ||||
JP3130678A | ||||
JP3064208A | ||||
JP10320075A |
Attorney, Agent or Firm:
Takashi Ishida
Shigeru Tsuchiya
Toshio Toda
Masaya Nishiyama
Shigeru Tsuchiya
Toshio Toda
Masaya Nishiyama
Previous Patent: OCEAN FACILITY FOR SHIPPING PETROLEUM
Next Patent: MANUFACTURE OF CLAD MATERIAL BY EXTRUSION
Next Patent: MANUFACTURE OF CLAD MATERIAL BY EXTRUSION