#Memory configuration for the RT1051 platform

#Memory interfaces

There are 4 memory interfaces available for the platform. Three of them connect to FlexRAM inside the MCU, fourth is an external SDRAM. Inside the chip there are:

• OCRAM - clocked with peripheral clock.
• TCM - clocked with CPU clock. TCM is a high speed memory interface which allows to access data via two 32bit DTCM interfaces and/or instructions via a single 64 bit interface.

Currently RT1051 offers:

• 64 kB of OCRAM memory;
• 448 kB of DTCM memory;
• 16 MB of SDRAM memory.

#Firmware in the memory

During linking firmware is split between memory regions. Data that need to be accessed fast is placed inside the chip (system code and data mostly),

• data that cannot be cached (NonCacheable*),
• system data, including system heap in (see heap_4.c),
• common symbols (e.g. errno variable),
• system stack (used before starting scheduler and by scheduler itself),
• relocated "fast" functions (.ramfunc)

The rest is placed in the SDRAM split between two regions:

• user code, including exception handling (BOARD_SDRAM_TEXT),
• big buffers, including user heap (see usermem.c, region BOARD_SDRAM_HEAP)

Currently there is no data in the OCRAM region, though it could be used for DMA buffers.