Texas Instruments TMS320F20x/F24x DSP manual Preliminary, Assembly Source for Algorithms, A-20

Assembly Source for Algorithms

PRELIMINARY

* bits. For example, if the flash is programmed using a			*
* CLKOUT period of 50 ns, the flash can be reliably read			*
*	back over the CLKOUT period range of 50	ns to 150 ns	*
*	(6.67MHz±20 MHz). The programming pulse	duration is	*

* 100 us, and a maximum of 150 pulses is applied per row. *

*			*
* The following variables are used for temp storage:			*
*	AR0	Used for comparisons	*
*	AR1	Used for pgm pulse count	*
*	AR2	Used for row banz loop	*
*	AR3	Used for buffer addr index	*
*	AR4	Used for flash address.	*
*	AR6	Parameter passed to Delay	*
*	SPAD1	Flash program and STOP commands	*
*	SPAD2	Flash program + EXE command	*
*	FL_ADRS	Used for flash address	*
*	FL_DATA	Used for flash data	*
*	BASE_0	Used for row±done flag	*
*	BASE_1	Used for row start address	*
*	BASE_2	Used for row length±1	*
*	BASE_3	Used for buffer/row start addr	*
*	BASE_4	Used for destination end addr	*
*	BASE_5	Used for byte mask	*

*************************************************************

.include		ºsvar20.hº
*
MAX_PGM	.set	150	;Allow only 150 pulses per row.
VER0	.set	010h	;VER0 command.
WR_CMND	.set	4	;Write command.
WR_EXE	.set	045h	;Write EXEBIN command.
STOP	.set	0	;Reset command.
	.def	GPGMJ
	.ref	PRG_bufaddr,PRG_length,PRG_paddr
	.ref	PROTECT,DELAY,REGS,ARRAY
	.sect	ºfl_prgº

*********************************************************

* GPGMJ: This routine programs all or part of			*
*	the flash as specified by the variables:		*
*	PRG_paddr	Destination start address	*

*	PRG_length		Source buffer length	*
*	PRG_bufaddr		Buffer start address	*
*				*
* The following variables are used for temp				*
*	storage:			*
*	AR0	Used for comparisons		*
*	AR1	Used for pgm pulse count		*
*	AR2	Used for row banz loop		*
*	AR3	Used for buffer addr index		*
*	FL_ADRS	Used for flash address		*
*	FL_DATA	Used for flash data		*
*	BASE_0	Used for row±done flag		*
*	BASE_1	Used for row start address		*
*	BASE_2	Used for row length±1		*

A-20 PRELIMINARY