基于FPGA的SDIO信号差分传输系统的实现

FPGA-based Implementation of SDIO Transmission by Using LVDS

SDIO接口以其传输速度快、兼容性好等优点,被广泛应用于移动手持设备中。现为满足SDIO安全模块的可靠性检测需求,需对SDIO信号进行无失真远距离传输设计。常用的SDIO接口由专用接口芯片实现或者采用FPGA模拟实现。这两种实现方法存在测量通道少、开发难度大和验证不充分等缺点,而提出的方法只从物理层改变SDIO信号传输,没有改变SDIO的传输协议。LVDS差分信号具有抗干扰能力强、高速、低功耗等特点。利用LVDS差分信号进行延长传输,可以减少SDIO信号的信号失真和传输延迟。主控单元FPGA设计采用VerilogHDL语言,结合有限状态机设计方法,实时监控SDIO信号,并控制差分信号传输方向。经实验验证,此SDIO信号的LVDS差分远传方法准确可靠,为SDIO信号远距离传输提供了解决方案。

The SDIO interface is widely used in mobile handheld devices for its fast transmission speed and good compatibility. In order to meet the reliability detection requirements of SDIO security module, it is necessary to do distortion-free and long-distance transmission design of SDIO signal. The commonly-used SDIO interface is implemented with a dedicated interface chip or by FPGA simulation. These two implementation methods have the disadvantages of less measurement channels, difficult development, and insufficient verification, and however, the existing method can only change the SDIO signal transmission from the physical layer, but does not change the transmission protocol of SDIO. The LVDS differential signal has the characteristics of strong anti-interference ability, high speed and low power consumption. By using LVDS differential signals for extended transmission, signal distortion and transmission delay of SDIO signals can be reduced. VerilogHDL language is adopted for FPGA design of main control unit, and in combination with finite state machine design method, the real-time monitoring of SDIO signal is realized and the transmission direction of differential signal controlled. Experiment indicates that this LVDS differential remote transmission method of the SDIO signal is accurate and reliable, and could provide a fairly good solution for long-distance transmission of SDIO signal.