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VR4102 Datasheet(PDF) 123 Page - NEC |
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VR4102 Datasheet(HTML) 123 Page - NEC |
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123 / 701 page ![]() CHAPTER 5 MEMORY MANAGEMENT SYSTEM 123 (1) useg (32-bit mode) In User mode, when UX = 0 in the Status register and the most significant bit of the virtual address is 0, User mode addressing is compatible with the 32-bit addressing model shown in Figure 5-4, and a 2-Gbyte user address space is available, labeled useg. Any attempt to reference an address with the most-significant bit set while in User mode causes an Address Error exception (see CHAPTER 6 EXCEPTION PROCESSING). The TLB Mismatch exception vector is used for TLB misses. (2) xuseg (64-bit mode) In User mode, when UX = 1 in the Status register and bits 63 to 40 of the virtual address are all 0, User mode addressing is extended to the 64-bit addressing model shown in Figure 5-4. In 64-bit User mode, the processor provides a single address space of 240 bytes, labeled xuseg. Any attempt to reference an address with bits 63:40 equal to 1 causes an Address Error exception (see CHAPTER 6 EXCEPTION PROCESSING). The XTLB Mismatch exception vector is used for TLB misses. |
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