Motorola M68EZ328ADS user manual Method, Offset Address of ROM Image

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Programming On-board Flash Memory

C.3 METHOD

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

FLASH Program

System RAM

	ROM Image	Copy the ROM Image from
		system RAM to Flash
offset
		Memory by the flash Pro-
		gram.

2005	Flash Memory
INC.
SEMICONDUCTOR,
	Figure C-1. Method of programming on-board Flash memory
	Flash memory can be programmed in bootstrap mode. First, a ROM image and a flash pro-
	gram are downloaded to the system memory by loading their b-records. Then, run the flash
	program. It will execute the Flash program command sequence and copy the ROM image
	from the system RAM to the Flash memory. The detailed steps are as follows.

FREESCALE	1.	Force the MC68EZ328 into bootstrap mode by turning S2-8 on and pressing RESET
		switch once.
	2.	Use BBUG.EXE or TERMINAL program to communicate with the M68EZ328ADS
BY		through RS232 port of a PC.
	3.	Initialize the internal registers of DragonBall-VZ by loading the INIT.B.
ARCHIVED
	5.	Load FLASHNML.B (the Flash Program) and ROM.B (the ROM image) to system
	4.	Make sure the Flash Memory is blank. Load ERASE.B to erase the flash memory
		when needed.
		RAM (EDO DRAM on M68EZ328ADS).
	6.	Execute the Flash Program by using the execution B-record. For example, if the start-
		ing address of Flash Program is 0x4000, the execution B-record is then "0000400000".

C.4 OFFSET ADDRESS OF ROM IMAGE

Figure C-1shows that the ROM image is first put to the system RAM before it is copied to Flash. In order to create S-record/B-record with download address different from its execu- tion address, an OFFSET is sometimes required to be specified in downloading program.

C-33M68EZ328ADS v2.0 USER’S MANUALMOTOROLA

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