Serial type interface circuit, power saving method thereof, and device having serial interface
First Claim
Patent Images
1. A serial type interface circuit for transmitting/receiving data via a serial interface, comprising:
- an analog circuit connected to a serial line for analog-processing transmission/reception signals of the serial line;
a digital circuit connected to said analog circuit for digital-processing the received signals from said analog circuit and the transmission signals to said analog circuit according to clocks;
a clock generation circuit for supplying said clocks to said digital circuit; and
a gate circuit for supplying the clocks of said clock generation circuit to said digital circuit and stopping the supply of the clocks simultaneously with cut of the power of said analog circuit according to a power save instruction.
4 Assignments
0 Petitions
Accused Products
Abstract
A power saving of a serial interface circuit decreases the unnecessary power consumption of a serial interface circuit, while decreasing the return time and expanding the power saving range. Gates are disposed for stopping the clock supply to a digital portion of the interface circuit while maintaining operation of clock sources in the digital portions. Therefore a quick shift to and return from the power save mode by stopping and restarting clocks is implemented, which further decreases power consumption.
37 Citations
20 Claims
-
1. A serial type interface circuit for transmitting/receiving data via a serial interface, comprising:
-
an analog circuit connected to a serial line for analog-processing transmission/reception signals of the serial line;
a digital circuit connected to said analog circuit for digital-processing the received signals from said analog circuit and the transmission signals to said analog circuit according to clocks;
a clock generation circuit for supplying said clocks to said digital circuit; and
a gate circuit for supplying the clocks of said clock generation circuit to said digital circuit and stopping the supply of the clocks simultaneously with cut of the power of said analog circuit according to a power save instruction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A power save method for an interface circuit for transmitting/receiving data via a serial interface, comprising the steps of:
-
controlling a gate circuit that supplies and stops clocks of a clock generation circuit to a digital circuit to be in a clock supply stop status according to a power save instruction, in said interface circuit comprising an analog circuit connected to a serial line for analog-processing transmission/reception signals of the serial line, and said digital circuit connected to said analog circuit for digital-processing the received signals from said analog circuit and the transmission signals to said analog circuit according to clocks; and
controlling said gate circuit to be in a clock supply status according to a return instruction. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A serial interface device for transmitting/receiving data with a host via a serial interface, comprising:
-
a serial interface circuit; and
a processing circuit connected to said serial interface circuit for transmitting/receiving data with said host, wherein said serial interface circuit comprises;
an analog circuit connected to a serial line for analog-processing transmission/reception signals of the serial line;
a digital circuit connected to said analog circuit for digital-processing the received signals from said analog circuit and the transmission signals to said analog circuit according to clocks;
a clock generation circuit for supplying said clocks to said digital circuit; and
a gate circuit for supplying the clocks of said clock generation circuit to said digital circuit and stopping the supply of the clocks simultaneously with cut of the power of said analog circuit according to a power save instruction. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification