DSP96002UMSLASHAD datasheet(93/111 Pages) NXP

93 / 111 page

Bootstrap Code for DSP96002

MOTOROLA

DSP96002/D, Rev. 2

A-3

; Host load routine

_HOSTR

_LBL11

JCLR

#3,X:(R2),_LBL22; if HF0=1, stop loading data.

ENDDO

; Must terminate the do loops

JMP

<_BOOTEND

_LBL22

JCLR

#0,X:(R2),_LBL11; Wait for HRDF to go high

; (meaning data is present).

JCLR

#4,X:(R2),_LBL33; 8-bit source?

MOVE

X:(R3),D0.L; Get 32-bit word from host

JMP

<_STORE

_LBL33

#4,_LOOP4; Get 4 bytes into D0.L

LSR

#8,D0; Shift previous byte down

_LBL1

JCLR

#3,X:(R2),_LBL2; if HF0=1, stop loading data.

ENDDO

; Must terminate the do loops

ENDDO

JMP

<_BOOTEND

_LBL2

JCLR

#0,X:(R2),_LBL1; Wait for HRDF to go high

; (meaning data is present).

MOVE

X:(R3),D1.L; Get byte from host

LSL

#24,D1; Shift into upper byte

D1,D0; concatenate

_LOOP4

_STORE

MOVEM

D0.L,P:(R0)+ ; Store 32-bit result in P mem.

_LOOP1

; and go get another 32-bit word

; This is the exit handler that returns execution to internal PRAM

_BOOTEND

ANDI

#$F9,OMR

; Set the operating mode to 00x

; (and trigger an exit from

; bootstrap mode).

ANDI

#$0,CCR; Clear CCR as if HW RESET.

; Also delay needed for

; Op. Mode change.

JMP

<$0; Start fetching from PRAM.

; DSP96002 bootstrap program size = 50 words

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

DSP96002UM/AD Datasheet(PDF) 93 Page - NXP Semiconductors

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