14. Coprocessor 0

14.2 Random Register (1)


The Random register is a read-only register of which six bits index an entry in the TLB. This register decrements when any instruction graduates at that particular cycle, and its values range between an upper and a lower bound, as follows:

The Random register specifies the entry in the TLB that is affected by the TLB Write Random instruction. The register does not need to be read for this purpose; however, the register is readable to verify proper operation of the processor.

To simplify testing, the Random register is set to the value of the upper bound upon system reset. This register is also set to the upper bound when the Wired register is written.

Figure 14-2 shows the format of the Random register; Table 14-3 describes the Random register fields.



Figure 14-2 Random Register

Table 14-3 Random Register Field Descriptions




Copyright 1995, MIPS Technologies, Inc. -- 29 JAN 96


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