The IEEE 1394 bus has advantages such as high transmission speed, long transmission distance, plug and play, supporting variable transmission modes and so on. This essay mainly focuses on study link layer in the bus protocol and data transfer in asynchronous and isochronous mode, design the control chip for IEEE 1394b link layer, implements the design on RTL-level programming and verify the design through software simulation. Main work completed consists of: analyzes the protocol structure of link layer, physical layer of IEEE 1394b bus, defines the link layer control chip's function and system structure divided into modules. Implement the design of modules with RTL programming and simulates the design in software.