There are seven SMMU TBUs supported by the SMMU TCU as listed in the following table.
| TBU | Ingress Source | Destination |
|---|---|---|
| TBU 0 | LPD AXI protocol | CCI S3 ACE-lite |
| TBU 1 | NoC NSU3 | CCI S2 ACE-lite |
| TBU 2 | Switch from S_AXI_HPC ACE_lite, or NoC NSU2 | CCI S1 ACE-lite |
| TBU 3 | CPM | CCI S0 ACE-lite, MSI |
| TBU 4 | Noc NSU1 | Switch to FPD main switch |
| TBU 5 | NoC NSU0, S_AXI_HP, CoreSight | FPD main switch or NoC NMU |
| TBU 6 | Noc NSU | NoC NMU |