DSP96002UMSLASHAD datasheet(91/111 Pages) NXP

91 / 111 page

MOTOROLA

DSP96002/D, Rev. 2

A-1

APPENDIX A

BOOTSTRAP CODE FOR DSP96002

; BOOTSTRAP CODE FOR DSP96002 -

;

; Host algorithm

/ AND / external bus method.

;

; This is the Bootstrap program contained in the DSP96002. This program

; can load the internal program memory from one of 4 external sources.

; The program reads the OMR bits MA and MB to decide which external

; source to access.

; If MB:MA = 0X - load from 4,096 consecutive byte-wide P: memory

; locations (starting at P:$FFFF0000).

; If MB:MA = 10 - load internal PRAM thru Host Interface in Port A.

; If MB:MA = 11 - load internal PRAM thru Host Interface in Port B.

BOOT

EQU

$FFFF0000; The location in P: memory

; where the external byte-wide

; EPROM is expected to be mapped

M_HCRA

EQU

$FFFFFFEC; Port A Host Control Register

M_HSRA

EQU

$FFFFFFED; Port A Host Status Register

M_HRXA

EQU

$FFFFFFEF; Port A Host Rec. Data Register

M_HCRB

EQU

$FFFFFFE4; Port B Host Control Register

M_HSRB

EQU

$FFFFFFE5; Port B Host Status Register

M_HRXB

EQU

$FFFFFFE7; Port B Host Rec. Data Register

ORG

PL:$0; bootstrap code starts at P:$0

START

MOVE

#BOOT,R1; R1 = External P: address of

; bootstrap byte-wide ROM

MOVEI

#0,R0

; R0 = starting P: address of

; internal memory where program

; will begin loading.

; If this program is entered by changing the OMR to bootstrap mode,

; make certain that registers M0 and M1 have been set to $FFFFFFFF.

; Make sure the appropriate BCR register is set to $xxxxxxFx since

; EPROMs are slow.

; Make sure that the Port Selection Register is set to permit program

; memory accesses thru the required memory expansion port (Port A or B).

;

; The first routine will load 4,096 bytes from the external P memory

; space beginning at P:$FFFF0000 (bits 7-0).

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 first routine loads data

; starting with the least significant byte of P:$0 first.

; The Port Selection Register is not set by this program. It is set

; by HW Reset.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

DSP96002UM/AD Datasheet(PDF) 91 Page - NXP Semiconductors

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