The Research of Data Interface Adaptive Card of Computer to Plate

The data interface adaptive card is a very important printing device which is used to connect PC(personal computer) and output device of platers. In recent years, most of the data interface cards usedin CTP belongs to PCI (peripheral component Interconnect) cards, while as the development ofcomputer, using PCI card will bring many problems. For example, certain properties of themotherboard is needed to match the PCI card; the data line are very long and heavy, as a result, usersreflect that the card always appear bad connecting, another major reason is due to the fierce marketcompetition, the core technology of the card is unknown to outside, therefore, many companies haveto design their own data adaptive cards which increase the cost of production. So it is urgent to designa kind of data adaptive card which have no relationship with the type of PC and operating system tomeet the need of companies’ development and enhancing the market competitiveness.Some of the companies are still using PCI cards; A part of the CTP manufacturers are using theUSB data interface cards, the USB cards are highly welcomed because of its high speed transmission,convenience, plug and play and so on. There are also very few part of CTP manufacturers are usingthe Ethernet data interface card, although the Ethernet card have more networking capabilitiescompared to the USB card, a few of manufacturers use the network card because the card just appearson the market in recent years and it is hard to design.This paper proposes a design proposal which combine gigabit Ethernet and high speed FPGAexpanding a SDRAM chip outside which has large memory. This paper analyzes thoroughly thecommunicating principle of the physical layer and FPGA、 the Ethernet data frame structure、 theinterface protocols between PHY and FPGA、the working principle of SDRAM and how to control itand so on. In this system, the gigabit PHY chip88E1111finished the data processing of physical layer;the design of FPGA refer to the design of the function module such as the interface with PHY chipsuch as GMII and RGMII、 identifying, decoding and encoding the data package、 store the datareceived、 the control of the SDRAM、the design of the communication protocol between PC andFPGA and the interface with the CTP device、CRC Check.This system adopts the Verilog hardware description language, combining Quartus II11.0whichbelongs to the Altera and Modelsim which is a simulation software to realize module coding, functionverification, timing constraints, as well as the layout, and then use the debug tool signaltap to verify ifevery module are correct. At last, test the system on the board.Experimental results show that the gigabit data interface realize the function of the original PCIcard, the parameter reach the expected requirements, what’s more, the gigabit card have more advantages in many areas such as speed, adaptive. The cost of the system is lower, it has short cycle,and it can be applied to the other electronic system design.