Line-field synchronizing signal generating device with adjustable resolution

Abstract

The invention discloses a line-field synchronizing signal generating device with adjustable resolution. Two line-field parameter registers are adopted to store line-field parameters in a default display mode and an adjustable display mode respectively, input of a port is selected according to the display mode at the top layer, and a corresponding line-field parameter is selected to be sent to a line-field synchronizing signal generating module; and a line signal counter performs counting to a clock, the field signal counter performs counting to the count cycle of the line signal counter, then according to the count values of the line signal counter and the field signal counter and the line-field parameters, high level or low level is output, and a line-field synchronizing signal and a data effective signal are obtained. According to the invention, FPGA (Field Programmable Gate Array) can be used to realize the line-field synchronizing signal generating device, Verilog language can be adopted to describe the two counters, judge modules adopt corresponding if statements to perform level judging according to count values so as to obtain the line-field synchronizing signal with adjustable resolution and the data effective signal, and the implementation logic is simpler and more intuitive.

Description

technical field [0001] The invention belongs to the field of video technology, and more specifically relates to a line and field synchronous signal generation device with adjustable resolution. Background technique [0002] A common horizontal and vertical synchronization signal generating device uses a state machine to generate corresponding horizontal and vertical synchronization signals, and the values ​​of the timing parameters are fixed, which are all values ​​at a specific resolution, that is, the resolution is not adjustable. For example, the VGA display designed by Li Guogang, Yu Jun, and Ling Chaodong in "The Implementation Method of VGA Graphics Controller Based on FPGA" strictly follows the "VGA industry standard". This kind of pattern. But in the simulation of image processing, etc., this method is inconvenient. As another example, for the digital video signal generator used for digital image processor detection, it is different from the traditional analog vide...

AI Technical Summary

Problems solved by technology

[0003] At the same time, the state machine is used to realize the generation of line and field synchronization signals. Although there is no error, the implementation logic is complicated and the resources consumed are relatively large.

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