MIPS R3010 is a numeric co-processor for
R3000 RISC processor. R3000 FPU can
perform conversion, comparison, load, store, move and arithmetic
operations with single and double-precision numbers. The R3010 FPU
resides on the same system bus as the main CPU, and communicates with
the CPU using R3000 co-processor interface. During its operation the
R3010 co-processor monitors system bus, and when it encounters
floating-point instruction it loads it into 6-stage pipeline, where
the instruction is decoded and executed. For instruction execution
the FPU utilizes three calculation units: Addition/Subtraction,
Multiplication and Division. Operations in these units can be
performed concurrently, which allows the co-processor to execute up
to three different instructions at the same time. Also, during
execution of floating-point instructions the main processor may
continue to execute non-floating instructions. Once the FPU finishes
instruction processing, it sends results and exception data back to
the CPU. Please note that while the co-processor doesn't require
assistance of the main CPU in processing floating-point instructions,
it still requires the main CPU to generate necessary cache and memory
signals.
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