Motorola user manual DSP56301 User’s Manual

; 7-0). The memory is selected by the Address Attribute AA1 and is

;accessed with 31 wait states.

; The EPROM		bootstrap code expects first			to read	3 bytes	specifying	the
; number	of program words, then 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	the program words		are read,	program	execution	starts

;from the same address where loading started.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;If MD:MC:MB:MA=x010, then it loads the program RAM from the SCI interface.

; The SCI bootstrap code expects					first	to receive	3 bytes specifying	the
; number	of program		words,	then	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 received		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.

; The SCI is	programmed to work in asynchronous				mode	with	8 data bits,	1
; stop bit	and no parity.	The	clock	source	is external		and the clock
; frequency	must be 16x the	baud	rate.	After	each	byte is received,		it

;is echoed back through the SCI transmitter.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;If MD:MC:MB:MA=x011, then it loads the program RAM from the Host Interface

;programmed to operate in the Universal Bus mode supporting DSP-to-DSP

;glueless connection.

;

; The HI32

bootstrap

code expects

first

to read a 24-bit

word specifying

; the number of program

words,

then a 24-bit word

specifying

the

; address to start loading

the program

words, and then

24-bit

word

for

; each

program

word

to be loaded.

;

; The

program

words

will

be

stored

in contiguous

PRAM

memory

; locations

starting

at

the

specified

starting

address.

After

; the

program

words are

read,

program

execution

starts

from

the

same

;address where loading started.

;	The Host Interface	bootstrap	load program may be stopped by setting	the
;	Host Flag 0 (HF0)	in HCTR	register. This will start execution of	the

;loaded program from the specified starting address.

; During the access, the HAEN and HA[10 – 3] pins must be driven low; pins

;HA[2 – 0] select the HI32 registers.

;Before booting through the Host Interface it is recommended that the

A-2 DSP56301 User’s Manual