摘要
在图像压缩调试过程中,压缩数据在实时硬盘存储的基础上,还要与PC机连接进行效果评估。为了解决数据压缩板在通用串行接口(USB)高速数据传输中双重角色(主机/外设)的矛盾,本文采用具有OTG功能的USB芯片ISP1761实现了协议转换、主从自动切换控制以及上/下行高速数据传输。针对ISP1761支持PowerPC微处理器接口的高速性能,采用Xilinx公司的Virtex4系列FPGA芯片,通过其内嵌的PowerPC硬核处理器完成芯片初始化以及DMA数据传输控制。实现了对JPEG2000压缩后图像的45.5Mb/s上/下行有效数据传输,满足了实时存储和调试的要求。
In image compression debugging, compression data are stored in hard disk real time, and uploaded to the personal computer for the purpose of evaluation simultaneously. In order to settle the contradiction of duplicative roles（host/peripheral） of data compression board in the USB transfer, ISP1761,which is USB OTG chip, is introduced to realize protocol transform, control host/ Peripheral switchover, dominate up/down high speed data transfer, According to the capability of PowerPC in ISP1761, Virtex4 FPGA chip, which contain PowerPC hardcore, is adopted to fulfill initialization and DMA data transfer.High speed（45.5Mb/s） JPEG2000 compression data transfer is achieved, and realtime storage or debugging is satisfied.
出处
《电子技术应用》
北大核心
2008年第1期44-46,51,共4页
Application of Electronic Technique
