CPLD-based colorized liner CCD sensor on wood color selection system

LU Rong-jian， CHEN Feng-rao
（College of Mechanical and Electronic Engineering， Nanjing Forestry University， Nanjing 210037， China）

Abstract：  Aiming at the drive circuit design of colorized liner CCD to wood color selection system，a CPLD-based drive circuit was proposed. The system diagram of the CCD driver was introduced at first，and then the important blocks were described in detail. Altera's EMP240 was used in the circuit，the driving sequential signal of colorized liner CCD - TCD2252D was analyzed，through VHDL，the details about CPLD design which pulse sending unit was achieved，and the relevance between each pulse was given as well. Moreover，RBG color space to HSL conversion was introduced briefly. Finally，the signal simulation on QUARTUS 2 and the experiment with logic analyzer was proceeded. The results indicate that the CPLD-based driver circuit is reliable，chip，easy to maintain，and suitable for the design of CCD drive circuit.
Key words： charge coupled devices（CCD）；complex programmable logic device（CPLD）；VHDL language；QUARTUS 2