DSP96002UMSLASHAD datasheet(92/111 Pages) NXP

92 / 111 page

Bootstrap Code for DSP96002

A-2

DSP96002/D, Rev. 2

MOTOROLA

; The second routine loads the internal PRAM using the Host

; Interface logic.

; If HF1=0, it will load 4,096 bytes from the external host processor.

; These will be condensed into 1,024 32-bit words and stored in

; contiguous internal PRAM memory locations starting at P:$0.

Note that

; the routine loads data starting with the least significant byte of

; P:$0 first.

; If HF1=1, it will load 1,024 32-bit words from the external host

; processor.

; If the host processor only wants to load a portion of the P memory,

; and start execution of the loaded program, the Host Interface

; bootstrap load program routine may be killed by setting HF0 = 0.

;

INLOOP

#1024,_LOOP1; Load 1,024 instruction words

; This is the context switch

JSET

#1,OMR,_HOSTLD; Perform load from Host

; Interface if MB=1.

; This is the first routine. It loads from external P: memory.

#4,_LOOP2; Get 4 bytes into D0.L

LSR

#8,D0; Shift previous byte down

MOVEM

P:(R1)+,D1.L; Get byte from ext. P mem.

LSL

#24,D1; Shift into upper byte

D1,D0; concatenate

_LOOP2

JMP

<_STORE; Then put the word in P memory

;

; This is the second routine. It loads thru the Host Interface.

_HOSTLD

JSET

#0,OMR,_HOSTB; Port A or Port B?

; Boot thru Host Interface in Port A

_HOSTA

BCLR

#5,X:M_HCRA; Enable Port A Host Interface

MOVE

#M_HSRA,R2; R2 points to HSRA

MOVE

#M_HRXA,R3; R3 points to HRXA

JMP

<_HOSTR; go to host routine

; Boot thru Host Interface in Port B

_HOSTB

BCLR

#5,X:M_HCRB; Enable Port B Host Interface

MOVE

#M_HSRB,R2; R2 points to HSRB

MOVE

#M_HRXB,R3; R3 points to HRXB

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

DSP96002UM/AD Datasheet(PDF) 92 Page - NXP Semiconductors

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