Mips Technologies R4000 - Wired Register (6)

Chapter 4
88 MIPS R4000 Microprocessor User's Manual
Wired Register (6)
The Wired register is a read/write register that specifies the boundary
between the wired and random entries of the TLB as shown in Figure 4-13.
Wired entries are fixed, nonreplaceable entries, which cannot be
overwritten by a TLB write operation. Random entries can be overwritten.
Figure 4-13 Wired Register Boundary
The Wired register is set to 0 upon system reset. Writing this register also
sets the Random register to the value of its upper bound (see Random
register, above). Figure 4-14 shows the format of the Wired register; Table
4-10 describes the register fields.
Figure 4-14 Wired Register
Table 4-10 Wired Register Field Descriptions
Field Description
Wired TLB Wired boundary
0
Reserved. Must be written as zeroes, and returns
zeroes when read.
47
Wired
Range of Random entries
0
TLB
Register
Range of Wired entries
Wired Register
31 6 5 0
26 6
Wired
0