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ARM Bridges : System Interconnect Diagram Clarification

In the System Interconnect Diagram of the L138 showing all of its switched central resources and bridges there is shown three ARM bridges connected to one ARM SCR: BR1 BR2 and BR0 connected to SCR0. How are the bridges selected by ARM-mastered transactions? e.g. Do all accesses to mDDR go through BR1? Do all accesses to EMIFA go out BR0? Are there particular ARM instructions that result in BRX selection?