摘要:
A video transmission device 10 has: a packer 11 which receives a video signal, a sync signal, and a data-enable signal, and generates a plurality of packet signals by packetizing the video signal and the sync signal based on the data-enable signal and according to the number of bytes of a packet corresponding to the number of gradation bits of the video signal; an encode unit 15 which generates a plurality of encoded packet signals by encoding the plurality of packet signals; and a serializer 14 which generates a serial packet signal by parallel-serial converting the plurality of encoded packet signals. The packer 11 generates a control signal including a pulse with a pulse width corresponding to the number of bytes of the packet, and the encode unit 15 subjects a portion of the packet signals corresponding to the pulse in the control signal from the packer, to an encode process which is different from a process for the other portion.
摘要:
When the value of a power supply voltage (VDD) becomes a first threshold value or higher, a first start-up circuit (20) causes a band gap reference circuit (10) to start a stable operation and a first voltage value (V A ) is output from the band gap reference circuit (10). When the value of the power supply voltage becomes a second threshold value or higher which is greater than the first threshold, a second start-up circuit (40) turns on a PMOS transistor (MP 3 ) of a voltage dividing circuit (30), and a second voltage value (V B ) output from the voltage dividing circuit (30) becomes a value, which is derived by dividing the value of the power supply voltage according to the resistance ratio of resistors (R 31 , R 32 ). From a voltage comparison circuit (50), a reset level voltage value is output when the second voltage value (V B ) is smaller than the first voltage value (V A ), and a power-supply voltage level voltage value is output if the second voltage value (V B ) becomes the first voltage value (V A ) or higher,.
摘要:
A data reception unit 21 of a reception device 20 n receives calibration data to detect a data reception state or a clock reception state in the reception device 20 n from a data transmission unit 11 of a transmission device 10. A decoder unit 24 causes a transmission unit 26 to send out calibration sample data that a sampler unit 23 obtained by sampling calibration data to the transmission device 10. A control unit 15 of the transmission device 10 detects a data reception state or a clock reception state in the reception device 20 n based on calibration sample data received from the reception device 20 n and controls the data transmission unit 11 and a clock transmission unit 12 based on the detection result.
摘要:
A video transmission device 10 has: a packer 11 which receives a video signal, a sync signal, and a data-enable signal, and generates a plurality of packet signals by packetizing the video signal and the sync signal based on the data-enable signal and according to the number of bytes of a packet corresponding to the number of gradation bits of the video signal; an encode unit 15 which generates a plurality of encoded packet signals by encoding the plurality of packet signals; and a serializer 14 which generates a serial packet signal by parallel-serial converting the plurality of encoded packet signals. The packer 11 generates a control signal including a pulse with a pulse width corresponding to the number of bytes of the packet, and the encode unit 15 subjects a portion of the packet signals corresponding to the pulse in the control signal from the packer, to an encode process which is different from a process for the other portion.
摘要:
A PLL frequency synthesizer 1 according to one embodiment of the present invention is provided with a frequency divider 30, a phase comparator 40, a charge pump 50, a loop filter 60, a voltage controlled oscillator 70, and a changeover switch (within the switching unit 80). The loop filter 60 has a reference potential on a semiconductor substrate as a ground potential, and the changeover switch is formed on the semiconductor substrate 2 and switches connection between an intermediate node of the loop filter 60 and the reference potential on the semiconductor substrate 2 to switch the time constant of the loop filter 60.
摘要:
The clock data restoration device 1 is a device which restores a clock signal and data on the basis of an input digital signal and comprises an equalizer section 10, a sampler section 20, a clock generation section 30, an equalizer control section 40, and a phase monitor section 50. As a result of the loop processing of the equalizer section 10, the sampler section 20, and the equalizer control section 40, a control of a level adjustment amount of the digital signal by the equalizer section 10 is carried out However, the control is stopped by the phase monitor section 50 when the phase difference between the clock signal CK and the digital signal is greater than a predetermined value. As a result, a clock signal and data can be restored more accurately.
摘要:
A semiconductor integrated circuit such that deterioration in clock phase precision due to the unevenness of the stray capacitance of a multiphase clock signal line and an increase in substrate area are suppressed when the multiphase clock signal line is led from a ring oscillation circuit capable oscillating at a high frequency. This semiconductor integrated circuit includes N stages of amplifier circuits connected in a ring shape, oscillating and arranged separately in a plurality of columns on a semiconductor substrate. The amplifier circuit at the m-1-th stage and the amplifier circuit at the m-th state are not adjacent to each other in each column where m is an arbitrary integer from 2 to N. A plurality of lines for extracting a plurality of output signals from the amplifier circuits of one of the columns are provided.
摘要:
[PROBLEMS] To realize a circuit capable of keeping the duty ratio of the output equiphase polyphase clock signal constant independently of the duty ratio of an input signal, while minimizing an increase of the number of elements and further suppressing an increase of the circuit area of the semiconductor board and an increase of the power consumption. [MEANS FOR SOLVING PROBLEMS] In the equiphase polyphase clock signal generator circuit, an input clock signal is frequency divided by two, thereby converting it to a complementary clock signal, which is then inputted to a complementary voltage control delay element array. Since the input clock signal has been frequency divided by two, the complementary clock signal as frequency divided is not dependent on the duty ratio of the input clock but holds a constant duty ratio. This complementary clock signal as frequency divided is inputted to the voltage control delay element array, a complementary output signal from which is phase compared with the complementary clock signal as frequency divided, whereby an equiphase polyphase clock signal synchronized with the input clock signal can be outputted.
摘要:
(Problems) To realize a circuit capable of keeping a constant duty ratio of output isophase multiphase clock signals independently from the duty ratio of input clock signal while minimizing the increase of the number of devices and suppressing the increase of the circuit area of the semiconductor substrate and the increase of the power consumption. (Means for Solving the Problems) In an isophase multiphase clock signal generation circuit according to the present invention, an input clock signal is converted into a 1/2-frequency-divided complementary clock signal and then is input to a complementary voltage controlled delay device array. The input clock signal is 1/2-frequency-divided, and therefore becomes a clock signal having a constant duty ratio with no dependency on the duty ratio of the input clock signal. The frequency-divided complementary clock signal is input to the voltage controlled delay device array, and the phase of the complementary output signal from the voltage controlled delay device array is compared with the phase of the frequency-divided complementary clock signal. Thus, isophase multiphase clock signals synchronized with the input clock signal can be output.
摘要:
A semiconductor integrated circuit such that deterioration in clock phase precision due to the unevenness of the stray capacitance of a multiphase clock signal line and an increase in substrate area are suppressed when the multiphase clock signal line is led from a ring oscillation circuit capable oscillating at a high frequency. This semiconductor integrated circuit includes N stages of amplifier circuits connected in a ring shape, oscillating and arranged separately in a plurality of columns on a semiconductor substrate. The amplifier circuit at the m-1-th stage and the amplifier circuit at the m-th state are not adjacent to each other in each column where m is an arbitrary integer from 2 to N. A plurality of lines for extracting a plurality of output signals from the amplifier circuits of one of the columns are provided.