This constant defines the size, in bytes, of the memory blocks to be allocated from fixed-size memory pool #3. The value of this constant should be less than the value of OS_FIX_POOL2_ITEM_SIZE. It is utilized only when OS_USE_FIXMEM_POOLS is set to 1. Use the OS_FIX_POOL3_SIZE constant to define the total size of memory pool #3. For more information regarding fixed-size memory management, please refer to system memory management.