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Appendix A
Bootstrap Program
This appendix lists the bootstrap program and equates for the DSP56303. Motorola posts
updates to the bootstrap program on the Worldwide Web at the following URL:
http://www.mot.com/SPS/DSP/tools/other.html
A.1
Bootstrap Code
; BOOTSTRAP CODE FOR DSP56303 - (C) Copyright 1995 Motorola Inc.
; Revised June, 29 1995.
;
; Bootstrap through the Host Interface, External EPROM or SCI.
;
; This is the Bootstrap program contained in the DSP56303 192-word Boot
; ROM. This program can load any program RAM segment from an external
; EPROM, from the Host Interface or from the SCI serial interface.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; If MD:MC:MB:MA=1000, then the Boot ROM is bypassed and the DSP56303 will
; start fetching instructions beginning with the address $8000 assuming that
; an external memory of SRAM type is used. The accesses will be performed
; using 31 wait states with no address attributes selected (default area).
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; If MC:MB:MA=001, then it loads a program RAM segment from consecutive
; byte-wide P memory locations, starting at P:$D00000 (bits 7-0).
; The memory is selected by the Address Attribute AA1 and is accessed with
; 31 wait states.
; The EPROM bootstrap code expects to read 3 bytes
; specifying the number of program words, 3 bytes specifying the address
; to start loading the program words and then 3 bytes for each program
; word to be loaded. The number of words, the starting address and the
; program words are read least significant byte first followed by the
; mid and then by the most significant byte.
; The program words will be condensed into 24-bit words and stored in
; contiguous PRAM memory locations starting at the specified starting
: address.
; After reading the program words, program execution starts from the same
; address where loading started.
;
A-1
Bootstrap Program
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