Summary: Introduced a kind of LED big screen that is based on FPGA to devise plan, introduce the design idea of top-down, designed the double mouth RAM that is based on FPGA and scanning control circuit, in solving traditional LED big screen to design, control the problem that complex ﹑ dependability needs the system.
Keyword: Odd a machine, FPGA, LED big screen, double mouth RAM

The LED big screen that uses at present shows control circuit of the system, mostly by individual or many CPU and complex periphery circuit composition, this kind of circuit is designed, odd a machine process designing is more complex, of whole circuit debug more troublesome, dependability and real time sex get very hard assuring. Be aimed at this kind of circumstance, introduce a kind of LED big screen that is based on CycloneEP1C6 to devise plan, this design program is beardless outside hang FLASH ROM and RAM, beardless any exterior function circuit, all functions all mix by a CycloneEP1C6 odd SPCE061A comes to a machine implementation, have data processing rate the characteristic with fast, high reliability. Among them of RAM of FPGA interior double mouth apply, for the data between diverse bus line communication offerred a new solution. 　

1 construction of system and function are summarized

The design has 192 × together to seeming the electronic screen of lattice of 128 gules LED. Whole electron screen is modular structure, every 4 16 × the lattice of 16 piece for an unit, in all 3 × such 8 unit. The requirement on screen shows 5 screen content continuously, and every screen has fluctuation to control the animation effect such as shift, screen of room distance electron is the main control in applying actually about 200 meters. The demand that links design object and the characteristic that big screen designs, block diagram of construction of system is shown 1 times like the graph. Graph 1 system block diagram

LED big screen designs a system to comprise by 3 main unit: Go up a machine image / literal editor and send partial unit, advocate accuse board screen of electron of unit, LED. On the system machine will control by a PC, basically be an editor, send picture / literal information arrives advocate accuse board, and advocate accuse board show on big to after these data undertake handling, be being sent screen come.

2 systems hardware is designed

Systematic hardware design basically is right advocate accuse board design, advocate accuse board main function includes: Control of storage of data news report, data, data processing, scanning. Design of traditional LED big screen is mixed by the FLASH ROM that regards data as memory data processing cache implement RAM, CPU and but the FPGA/CPLD of process designing logistic parts of an apparatus, RAM composition that regards data as scanning buffer, its structure is shown 2 times like the graph. Graph big screen of 2 traditional LED is designed advocate accuse to harden composition of a picture
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