RM7065A-350T View Datasheet(PDF) - PMC-Sierra

Part Name

Description

Manufacturer

RM7065A-350T

RM7065A™ Microprocessor with On-Chip Secondary Cache

PMC-Sierra 

RM7065A™ Microprocessor with On-Chip Secondary Cache Data Sheet

Preliminary

the core primitive of almost all signal processing algorithms. Therefore, using the RM7065A

eliminates the need for a separate DSP engine in many embedded applications.

4.7 Floating-Point Coprocessor

The RM7065A incorporates a high-performance fully pipelined floating-point coprocessor which

includes a floating-point register file and autonomous execution units for multiply/add/convert and

divide/square root. The floating-point coprocessor is a tightly coupled execution unit, decoding

and executing instructions in parallel with, and in the case of floating-point loads and stores, in

cooperation with the M pipe of the integer unit. The superscalar capabilities of the RM7065A

allow floating-point computation instructions to issue concurrently with integer instructions.

4.8 Floating-Point Unit

The RM7065A floating-point execution unit supports single and double precision arithmetic, as

specified in the IEEE Standard 754. The execution unit is broken into a separate divide/square root

unit and a pipelined multiply/add unit. Overlap of divide/square root and multiply/add is

supported.

The RM7065A maintains fully precise floating-point exceptions while allowing both overlapped

and pipelined operations. Precise exceptions are extremely important in object-oriented

programming environments and highly desirable for debugging in any environment.

Floating-point operations include:

• add

• subtract

• multiply

• divide

• square root

• reciprocal

• reciprocal square root

• conditional moves

• conversion between fixed-point and floating-point format

• conversion between floating-point formats

• floating-point compare

Table 5 gives the latencies of the floating-point instructions in internal processor cycles.

Proprietary and Confidential to PMC-Sierra, Inc and for its Customer’s Internal Use

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Document ID: PMC-2010145, Issue 2

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