System for transferring pixel data from a digitizer to a host memory

Abstract

One aspect of the invention relates to a method for synchronizing control signals with scaled digital video data. In one version of the invention, the method includes the steps of transferring digitized video data from a digitizer to a video scaler which stores the digitized video data to form pixel data and generates a pixel qualifier signal to indicate when pixel data is valid; storing the pixel data into a field memory in response to the pixel qualifier signal from the video scaler; storing control signal data in a control memory in response to the pixel qualifier signal, the control signal data being representative of control signals provided by the video scaler, such that a correspondence is created between the pixel data stored in the field memory and the control signal data stored in the control memory; and transferring the pixel data stored in the field memory and the control signal data stored in the control memory to a bus interface unit, the bus interface unit being coupled to a data bus of a host processor, such that the correspondence between the pixel data and the control signal data is maintained during the transfer.