DSP56321 datasheet(65/84 Pages) FREESCALE

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DSP56321 Technical Data, Rev. 11

Freescale Semiconductor

A-1

Power Consumption Benchmark

The following benchmark program evaluates DSP56321 power use in a test situation. It enables the PLL, disables

the external clock, and uses repeated multiply-accumulate (MAC) instructions with a set of synthetic DSP

application data to emulate intensive sustained DSP operation.

;**************************************************************************

CHECKS

Typical Power Consumption

;**************************************************************************

page

200,55,0,0,0

nolist

I_VEC EQU $000000; Interrupt vectors for program debug only

START EQU $8000; MAIN (external) program starting address

INT_PROG

EQU $100 ; INTERNAL program memory starting address

INT_XDAT

EQU $0; INTERNAL X-data memory starting address

INT_YDAT

EQU $0; INTERNAL Y-data memory starting address

INCLUDE "ioequ.asm"

INCLUDE "intequ.asm"

list

org

P:START

;

movep #$0243FF,x:M_BCR ;

; BCR: Area 3 = 2 w.s (SRAM)

; Default: 2w.s (SRAM)

;

movep

#$00000F,x:M_PCTL

; XTAL disable

; PLL enable

;

; Load the program

;

move

#INT_PROG,r0

move

#PROG_START,r1

#(PROG_END-PROG_START),PLOAD_LOOP

move

p:(r1)+,x0

move

x0,p:(r0)+

nop

PLOAD_LOOP

;

; Load the X-data

;

move

#INT_XDAT,r0

move

#XDAT_START,r1

#(XDAT_END-XDAT_START),XLOAD_LOOP

move

p:(r1)+,x0

move

x0,x:(r0)+

XLOAD_LOOP

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