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VR4102 Datasheet(PDF) 148 Page - NEC |
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VR4102 Datasheet(HTML) 148 Page - NEC |
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148 / 701 page  CHAPTER 5 MEMORY MANAGEMENT SYSTEM 148 5.5.4 Wired Register (6) The Wired register is a read/write register that specifies the lower boundary of the random entry of the TLB as shown in Figure 5-14. Wired entries cannot be overwritten by a TLBWR instruction. They can, however, be overwritten by a TLBWI instruction. Random entries can be overwritten by both instructions. Figure 5-14. Positions Indicated by the Wired Register 0 31 Value in the Wired register Range of Wired entries Range specified by the Random register The Wired register is set to 0 upon Cold Reset. Writing this register also sets the Random register to the value of its upper bound (see 5.5.2 Random register (1)). Figure 5-15 shows the format of the Wired register. Figure 5-15. Wired Register 4 5 0 31 0 Wired 27 5 Wired : TLB wired boundary 0 : Reserved for future use. Write 0 in a write operation. When this field is read, 0 is read. |
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