Methods of generating a pixel clock signal from a transmission clock signal and related data transmission methods for multimedia sources

Abstract

Methods of generating a pixel clock signal for a multimedia source are provided in which a transmission clock signal having a first frequency is generated from a reference clock signal that has a second frequency. The generated transmission clock signal is multiplied by a multiple to generate the pixel clock signal. The pixel clock signal has a third frequency that is the product of the second frequency and the multiple,

What is claimed is: 
     
         1 . A method of generating a pixel clock signal of a multimedia source, the method comprising:
 multiplying a frequency of a reference clock signal to generate a transmission clock signal;   outputting the transmission clock signal at the time data of the multimedia source is transmitted;   dividing a frequency of the generated transmission clock signal; and   multiplying a frequency of the divided transmission clock signal to generate the pixel clock signal of the multimedia source.   
     
     
         2 . The method of  claim 1 , wherein a clock multiplication unit is used to multiply the frequency of the reference clock signal by a predetermined amount to generate the transmission clock signal. 
     
     
         3 . The method of  claim 2 , further comprising generating the reference clock signal using a phase-locked loop or a delay-locked loop. 
     
     
         4 . The method of  claim 2 , further comprising dividing a frequency of the clock signal that is output from the clock multiplication unit to generate the transmission clock signal. 
     
     
         5 . A method of transmitting data of a multimedia source comprising:
 multiplying a frequency of a reference clock signal to generate a transmission clock signal;   dividing a frequency of the generated transmission clock signal;   multiplying a frequency of the divided transmission clock signal to generate a pixel clock signal;   converting parallel data in synchronization with the pixel clock signal into serial data; and   transmitting the serial data and the transmission clock signal to an external source.   
     
     
         6 . A multimedia system, comprising:
 a multimedia source that is configured to convert parallel data into serial data and to generate a transmission clock signal; and   a multimedia output device that is configured to receive the serial data from the multimedia source in synchronization with the transmission clock signal,   wherein the multimedia source comprises,   a clock generator that is configured to generate the transmission clock signal from a reference clock signal and to generate a pixel clock signal by both dividing and multiplying a frequency of the transmission clock signal;   a video processor that is configured to generate the parallel data in synchronization with the pixel clock signal; and   a transmitter that is configured to output the serial data in synchronization with the transmission clock signal.   
     
     
         7 . The multimedia system of  claim 6 , wherein the multimedia source further comprises a phase locked loop that is configured to generate the reference clock signal. 
     
     
         8 . The multimedia system of  claim 6 , wherein the clock generator that is configured to generate the pixel clock signal by both dividing and multiplying the frequency of the transmission clock signal comprises a clock generator that is configured to generate the pixel clock signal by first dividing a frequency of the transmission clock signal and by then multiplying a frequency of the divided transmission clock signal. 
     
     
         9 . The method of  claim 6 , wherein the frequency of the pixel clock signal is ⅘ the frequency of the transmission clock signal.