说明：  Wishbone规范具有如下特点:简单、紧凑，需要很少的逻辑门 完整的普通数据据传输总线协议，包括单个读写、快传输、读一修改一写周期、事件周期 数据总线宽度可以是8-64位 支持大端(big-endian)和小端(litle-endian)，接口自动完成两者之间的转换。支持存储器映射、FIFO存储器、交叉互联 握手协议，允许速率控制 可以达到每个时钟周期进行一次数据传输 支持普通周期结束、重试结束、错误结束等总线周期形式 支持用户自定义的标志:采用MASTER/SLAVE体系结构 支持多点进程(Multi-MASTER):仲裁算法用于定义 支持各种各样的IP核互联，包括USB、双向总线、复用器互联等 同步逻辑设计 非常简单的时序标准 与硬件实现技术无关(FPGA, ASIC等) 与设计工具无关。 相对于其他的IP核接口规范来说，Wishbone接口规范具有简单、开放、高效、利于实现等特点而且完全免费，并没有专利保护。基于上述优点，因此采用Wishbone总线进行接口设计。本文对Wishbone总线接口的设计参考了OpenCore上的有关设计。
( Wishbone specification has the following characteristics : a simple , compact, and requires very little logic gates complete common data bus data transfer protocols, including single reader , fast transmission, read-modify- write cycle, the event cycle data bus width can be 8-64 bit support big-endian (big-endian) and the small end (litle-endian), the interface automatically convert between the two. Support memory mapping , FIFO memory , cross interconnection handshake protocol that allows rate control every clock cycle to achieve a data transfer support normal cycle ends , retry the end , wrong end of the bus cycle and other forms support for user-defined flags : The MASTER/SLAVE architecture supports multi- process (Multi-MASTER): arbitration algorithm is used to define support a variety of IP cores interconnected , including USB, bi-directional bus , multiplexer interconnection , etc. synchronous logic design very simple timing standards technology-indepe)