MIPS R4000 Microprocessor User's Manual 157
Floating-Point Unit
Floating-Point Control Registers
The FPU has 32 control registers (FCRs) that can only be accessed by move
operations. The FCRs are described below:
• The Implementation/Revision register (FCR0) holds revision
information about the FPU.
• The Control/Status register (FCR31) controls and monitors
exceptions, holds the result of compare operations, and
establishes rounding modes.
• FCR1 to FCR30 are reserved.
Table 6-1 lists the assignments of the FCRs.
Table 6-1 Floating-Point Control Register Assignments
FCR Number Use
FCR0 Coprocessor implementation and revision register
FCR1 to FCR30 Reserved
FCR31 Rounding mode, cause, trap enables, and flags
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