JTAG (Joint Test Action Group) real-time on-chip debug method and system of multicore processor

The invention relates to JTAG (Joint Test Action Group) real-time on-chip debug method and system of a multicore processor. In the method, a software debugger generates a control command in accordance with a JTAG control protocol to cores of a debugged multicore processor, converts the control command to a control flow, and then sends the control flow to an enhanced TAP controller; the enhanced TAP controller converts the received control flow into a data packet in accordance with an on-chip debug communication protocol and sends the data packet to a debug user terminal through a debug bus; the debug user terminal converts the received data packet into a control command, and a response control command generates response data returned to the enhanced TAP controller through the debug bus; the enhanced TAP controller converts the received response data into a control flow in accordance with the JTAG control protocol, and the software debugger obtains the control flow through the enhancedTAP controller. The inven