Nec Network Controller uPD98502 Manual de usuario descargar pdf (Pagina 126)

100

101

CHAPTER 2 V

4120A

126

Preliminary User’s Manual S15543EJ1V0UM

2.4.5.11 Virtual-to-physical address translation

During virtual-to-physical address translation, the CPU compares the 8-bit ASID (when the Global bit, G, is not set

to 1) of the virtual address to the ASID of the TLB entry to see if there is a match. One of the following comparisons

are also made:

 In 32-bit mode, the high-order bits

Note 1

of the 32-bit virtual address are compared to the contents of the

VPN2 (virtual page number divided by two) of each TLB entry.

 In 64-bit mode, the high-order bits

Note 2

of the 64-bit virtual address are compared to the contents of the

VPN2 (virtual page number divided by two) of each TLB entry.

If a TLB entry matches, the physical address and access control bits (C, D, and V) are retrieved from the matching

TLB entry. While the V bit of the entry must be set to 1 for a valid address translation to take place, it is not involved

in the determination of a matching TLB entry.

Figure 2-46 illustrates the TLB address translation flow.

Notes 1. Up to bit 28. Number of bits depends on the TBL page size

2. Up to bit 29. Number of bits depends on the TBL page size

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 594 595

Comentarios a estos manuales

Sin comentarios

Nec Network Controller uPD98502 Manual de usuario Pagina 126

Comentarios a estos manuales

Relacionado con productos y manuales para Hardware Nec Network Controller uPD98502