I have 3 ARM CM3 processors.. However I want to bring only one JTAG & SW ports to external due to pad limitation. Can you please let me know if ARM has any IP which multiplexes 3 JTAG/SW interfaces internally?
CoreSight SoC-400, this is a interconnect IP for AHB-AP. you can integrate 3 CM3 processors into one DP (Debug Port) using the IP.