SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The CBA 4.0 North bridge, NB, bridges between CBA 4.0 compliant VBUSM interfaces and a three threaded CBA 4.0 compliant VBUSM.C interface. This is achieved by using M2M bridges to support all the M2M features and then an M2C bridge to convert the VBUSM interfaces to a VBUSM.C interface, which support duplex traffic. The M2M bridges allow for clock frequency conversion, data width conversion and fragmentation for the Source M2M bridge(s). This allows the M2C bridge to remain simple and operate at the VBUSM.C clock frequency and data width, as well as assume all required burst limitations have already been handled. Some additional features needed for the north bridge are implemented, including: adding memory attributes to source VBUSM transactions, and forcing a maximum outstanding read data limit.