Bootstrap Code - Motorola DSP56303 User Manual

Bootstrap Code

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; If MC:MB:MA=010, then it loads the program RAM from the SCI interface.
; The number of program words to be loaded and the starting address must
; be specified. The SCI bootstrap code expects to receive 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 received least significant byte first followed by the
; mid and then by the most significant byte. After receiving the
; program words, program execution starts in 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 MC:MB:MA=100, then it loads the program RAM from the Host
; Interface programmed to operate in the ISA mode.
; The HOST ISA bootstrap code expects to read a 24-bit word
; specifying the number of program words, a 24-bit word specifying the address
; to start loading the program words and then a 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 reading the program words, 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). This will start execution of the loaded
; program from the specified starting address.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; If MC:MB:MA=101, then it loads the program RAM from the Host
; Interface programmed to operate in the HC11 non multiplexed mode.
;
; The HOST HC11 bootstrap code expects to read a 24-bit word
; specifying the number of program words, a 24-bit word specifying the address
; to start loading the program words and then a 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 reading the program words, 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). This will start execution of the loaded
; program from the specified starting address.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; If MC:MB:MA=110, then it loads the program RAM from the Host
; Interface programmed to operate in the 8051 multiplexed bus mode,
; in double-strobe pin configuration.
; The HOST 8051 bootstrap code expects accesses that are byte wide.
; The HOST 8051 bootstrap code expects to read 3 bytes forming a 24-bit word
; specifying the number of program words, 3 bytes forming a 24-bit word
; specifying the address to start loading the program words and then 3 bytes
; forming 24-bit words for each program word to be loaded.
; The program words will be stored in contiguous PRAM memory locations
; starting at the specified starting address.
A-2 DSP56303 User's Manual