A master-ID (MReqMstID[7:0]) field is used by the CT_STM to encode a MASTER type of message:
- MReqMstID[7] – Differentiates software versus hardware masters (0 for software masters; 1 for hardware masters)
- MReqMstID[6:2] – Master address exported by the L3_MAIN interconnect debug subsystem target
- MReqMstID[1:0] – Additional qualifier for multicore masters (MPU, IPU)