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IDT MIPS32 4Kc Processor Core

CP0 Registers

79RC32438 User Reference Manual

November 4, 2002

Random Register (CP0 Register 1, Select 0)

The Random register is a read-only register whose value is used to index the TLB during a TLBWR

instruction. The width of the Random field is calculated in the same manner as that described for the Index

The value of the register varies between an upper and lower bound as follow:

A lower bound is set by the number of TLB entries reserved for exclusive use by the operating sys-

tem (the contents of the Wired register). The entry indexed by the Wired register is the first entry

available to be written by a TLB Write Random operation.

An upper bound is set by the total number of TLB entries minus 1.

The Random register is decremented by one almost every clock wrapping after the value in the Wired

an LFSR register is used that prevents the decrement pseudo-randomly.

The processor initializes the Random register to the upper bound on a Reset exception and when the

Wired register is written.

This register is only valid with the TLB.

Random Register Format

EntryLo0, EntryLo1 (CP0 Registers 2 and 3, Select 0)

The pair of EntryLo registers act as the interface between the TLB and the TLBR, TLBWI, and TLBWR

instructions. For a TLB-based MMU, EntryLo0 holds the entries for even pages and EntryLo1 holds the

entries for odd pages. The contents of the EntryLo0 and EntryLo1 registers are undefined after an address

error, TLB invalid, TLB modified, or TLB refill exceptions. These registers are only valid with the TLB.

Probe Failure. Set to 1 when the previous TLBProbe

(TLBP) instruction failed to find a match in the TLB.

Must be written as zero; returns zero on read.

Index to the TLB entry affected by the TLBRead and

TLBWrite instructions.

Table 2.27 Index Register Field Descriptions

Must be written as zero; returns zero on read.

TLB Random Index

Table 2.28 Random Register Field Descriptions

相關(guān)PDF資料	PDF描述
79RC32V333-100DHI	8-Pin, 1.5KB Flash Program, 64B Flash Data, 8MHz Internal Oscillator, -40C to +85C, 8-DFN, T/R
79RC32V333-133DH	8-pin, 1.5KB Flash Program, 64B Flash Data, 8MHz Internal Oscillator, -40C to +85C, 8-SOIC 150mil, T/R
79RC32V333-133DHI	Microprocessor
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