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The Cortex-M4 is connected to the interconnect (ML-AHB) via three ports, listed below and shown in the following figure:

  • I-bus is used to fetch code instructions in the 0x00000000--0x1FFFFFFF address range
  • D-bus is used to read/write data in the 0x00000000--0x1FFFFFFF address range
  • S-bus is used for all accesses in the 0x20000000--0xFFFFFFFF address range; all STM32MP15 internal peripherals registers are mapped in this range.
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