Designing SOCs with Configured Cores

10.5. The Diamond 570T CPU’s RPU

The Diamond 570T CPU core uses the same region-protection unit (RPU) discussed in Chapter 8 on the 212GP processor.

Figure 10.6 shows how the Diamond RPU divides the Diamond 570T CPU’s 4-Gbyte memory space into eight equally sized, 512-Mbyte regions. The Diamond 570T CPU core’s local data-memory address space and the address space assigned to the XLMI port fall into memory-protection region 1. Its local instruction-memory address space falls into memory-protection region 2. Thus the RPU can prevent accidental writes to instruction memory through the proper use of its protection mechanisms. The Diamond 570T CPU core’s non-local address space (assigned to the PIF) falls into all eight memory-protection regions, ...