| With advances in computer technology and digital signal processing technology, image sensing technology has been widely appreciated and used. We can obtain various parameters, and ultimately for the actual testing, measurement and control, by processing the image information gathered by CCD image sensor.Nowadays, with the rapid development of embedded designs, a single processor, ASIC or simple FPGA solutions, or even a combination of these programs are also unable to meet the requirements of the design. Driven by market demand, in order to meet the needs of the next generation of application processing, Xilinx defines Zynq-7000 series. To accommodate the latest platform Xilinx Zynq application in optical measurement and image acquisition, proposed a design method of the linear CCD data acquisition system based on Zynq.Based on in-depth analysis of the Xilinx Zynq All Programmable SoC platform architecture, we determined ZedBoard plus CCD data acquisition daughter board design scheme. Refined each functional module of the system. We completed the design and debug of the following functional modules, mainly includes CCD drive timing module, the high-speed AD acquisition module, power management module, data storage module and the data transmission module.Using Zynq as the control system, for model RL2048PAG-712 image sensor and a model for the AD9945 high-speed acquisition module, we designed a corresponding peripheral drive circuit and the voltage conversion circuit. Completed linear CCD timing-driven modules and high-speed AD acquisition module IP core design in PL part, by using Verilog hardware description language. Implemented external storage of the data while saving the use of processor resources and reducing the system power consumption, by adopting Direct Memory Access technology. In order to improve the data transfer speed between Zynq and PC, an Ethernet transmission mode has been used.Completed the PCB circuit board production. A preliminary test has been made for the completed functional modules. The test results show that the transfer rate of the data acquisition system and the stability performance, basically reached the expected requirements. |
