Dma Memory Bus; Dma Peripheral Bus; Ethernet Dma Bus; Usb Otg Hs Dma Bus - ST STM32F405 Reference Manual

RM0090
2.1.4

DMA memory bus

This bus connects the DMA memory bus master interface to the BusMatrix. It is used by the
DMA to perform transfer to/from memories. The targets of this bus are data memories:
internal SRAMs (SRAM1, SRAM2 and SRAM3) and external memories through the
FSMC/FMC.
2.1.5

DMA peripheral bus

This bus connects the DMA peripheral master bus interface to the BusMatrix. This bus is
used by the DMA to access AHB peripherals or to perform memory-to-memory transfers.
The targets of this bus are the AHB and APB peripherals plus data memories: internal
SRAMs (SRAM1, SRAM2 and SRAM3) and external memories through the FSMC/FMC.
2.1.6

Ethernet DMA bus

This bus connects the Ethernet DMA master interface to the BusMatrix. This bus is used by
the Ethernet DMA to load/store data to a memory. The targets of this bus are data
memories: internal SRAMs (SRAM1, SRAM2, SRAM3), internal Flash memory, and
external memories through the FSMC/FMC.
2.1.7

USB OTG HS DMA bus

This bus connects the USB OTG HS DMA master interface to the BusMatrix. This bus is
used by the USB OTG DMA to load/store data to a memory. The targets of this bus are data
memories: internal SRAMs (SRAM1, SRAM2, SRAM3), internal Flash memory, and
external memories through the FSMC/FMC.
2.1.8

LCD-TFT controller DMA bus

This bus connects the LCD controller DMA master interface to the BusMatrix. It is used by
the LCD-TFT DMA to load/store data to a memory. The targets of this bus are data
memories: internal SRAMs (SRAM1, SRAM2, SRAM3), external memories through FMC,
and internal Flash memory.
2.1.9

DMA2D bus

This bus connect the DMA2D master interface to the BusMatrix. This bus is used by the
DMA2D graphic Accelerator to load/store data to a memory. The targets of this bus are data
memories: internal SRAMs (SRAM1, SRAM2, SRAM3), external memories through FMC,
and internal Flash memory.
2.1.10

BusMatrix

The BusMatrix manages the access arbitration between masters. The arbitration uses a
round-robin algorithm.
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Memory and bus architecture
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