The Design And Realization Of Emulation/Test Module In YHFT-DSP

DSP (Digital Signal Processor) is a kind of embedded processor for digital signal processing. YHFT-DSPs are a series of 32-bit high performance DSP chips designed by Computer School of National University of Defense Technology. In this paper, based on the study of characteristics of the YHFT-DSP structure, combining DSP developing software developing and testing function, we designed and realized the emulation/test module which is compatiable of the Jiont Test Action Group criterion.The emulation/test module is important part of DSP's hardware.for example setting and cancelling hardware and software breakpoint, controlling instruction pipline, reading and writing CPUcore register and memory etc; and also provide testing function of scan out and scan in Boundary-Scan Register, MBIST and so on.This paper, analyzed the functions of the emulation/test module, accomplished the design of architecture, expanded the length of instruction register which belongs to JTAG, increased emulation commands, brought forward a emulation debug control mechanism with exact cycle boundary, finished the RTL-level coding of the emulation/test module, and completed module verification and system verification for the design. The results of verification have proved that the functions of the emulation/test module were correct, and achieved the design aim. It has been used by YHFT-DSP design and has been put into production.