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PM0056 数据表(PDF) 25 Page - STMicroelectronics |
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PM0056 数据表(HTML) 25 Page - STMicroelectronics |
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25 / 156 page  DocID15491 Rev 5 25/156 PM0056 The Cortex-M3 processor 2.2.1 Memory regions, types and attributes The memory map splits the memory map into regions. Each region has a defined memory type, and some regions have additional memory attributes. The memory type and attributes determine the behavior of accesses to the region. The memory types are: The different ordering requirements for Device and Strongly-ordered memory mean that the memory system can buffer a write to Device memory, but must not buffer a write to Strongly- ordered memory. The additional memory attributes include: Normal The processor can re-order transactions for efficiency, or perform speculative reads. Device The processor preserves transaction order relative to other transactions to Device or Strongly-ordered memory. Strongly-ordered The processor preserves transaction order relative to all other transactions. Execute Never (XN) Means the processor prevents instruction accesses. Any attempt to fetch an instruction from an XN region causes a memory management fault exception. |
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