VR4102 datasheet(680/701 Pages) NEC

680 / 701 page

CHAPTER 28 VR4102 COPROCESSOR 0 HAZARDS

680

(8) CACHE Index Store Tag

Source:

The confirmation of registers containing information necessary for executing this instruction.

(9) Coprocessor Usable Test

Source:

The confirmation of modes set by the bits of the CP0 registers in the “Source” column.

Examples 1.

When accessing the CP0 registers in User mode after the content of the CU0 bit of the Status

instructions, or branch instructions which use the resource of the CP0.

When accessing the CP0 registers in the operating mode set in the Status register after the

KSU, EXL, and ERL bits of the Status register are modified.

(10) Instruction Fetch

Source:

The confirmation of the operating mode and TLB necessary for instruction fetch.

Examples 1.

When changing the operating mode from User to Kernel and fetching instructions after the

KSU, EXL, and ERL bits of the Status register are modified.

When fetching instructions using the modified TLB entry after TLB modification.

(11) Instruction Fetch Exception

Destination: The completion of writing to registers containing information related to the exception when an

exception occurs on instruction fetch.

(12) Interrupts

Source:

The confirmation of registers judging the condition of occurrence of interrupt when an interrupt

factor is detected.

(13) Loads/Sores

Source:

The confirmation of the operating mode related to the address generation of Load/Store

instructions, TLB entries, the cache mode set in the K0 bit of the Config register, and the registers

setting the condition of occurrence of a Watch exception.

Example

When Loads/Stores are executed in the kernel field after changing the mode from User to Kernel.

(14) Load/Store Exception

Destination: The completion of writing to registers containing information related to the exception when an

exception occurs on load or store operation.

(15) TLB Shutdown

Destination: The completion of writing to the TS bit of the Status register when a TLB shutdown occurs.

VR4102 Datasheet(PDF) 680 Page - NEC