Texas Instruments TMS320F20x/F24x DSP manual AR0, AR1, AR2, AR6, Maxpgm, VER0, Wrcmnd, Wrexe, Stop

Assembly Source for Algorithms

PRELIMINARY

* programmed bits. For example, if the flash is programmed *

*using a CLKOUT period of 50 ns, the flash can be read back

*	reliably over the CLKOUT period range of 50 ns to 150 ns *
* (6.67 MHz±20 MHz). The programming pulse-duration is			*
* 100 us, and a maximum of 150 pulses is applied per row.			*
*			*
* The following resources are used for temporary storage:			*
*	AR0	Used for comparisons	*
*	AR1	Used for pgm pulse count	*
*	AR2	Used for row banz loop.	*
*	AR6	Parameter passed to Delay	*
*	FL_ADRS	Used for flash address	*
*	FL_DATA	Used for flash data.	*
*	FL_ST	Used for flash start address	*
*	BASE_0	Used for row±done flag	*
*	BASE_1	Used for row start address	*
*	SPAD1	Flash commands	*
*	SPAD2	Flash commands	*
*			**

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

	.include ºsvar20.hº
*
MAX_PGM	.set	150	;Only allow 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	GCLR
	.ref	PROTECT,SEG_ST,SEG_END
	.ref	DELAY,REGS,ARRAY
.sect		ºfl_clrº

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

*	GCLR: This routine performs a clear operation on the		*
* flash array defined by the FL_ST variable. The segments			*
* to be cleared are defined by the SEG_ST, SEG_END, and			*
*	PROTECT variables.		*
* The following resources are used for temp storage:			*
*	AR0	Used for comparisons	*
*	AR1	Used for pgm pulse count	*
*	AR2	Used for row banz loop	*
*	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 byte mask.	*

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

GCLR:
SETC	INTM	;Disable all ints.
CLRC	SXM	;Disable sign extension.
SPLK	#0,ERROR	;Reset error flag
LACL	SEG_ST	;Get segment start address.
SACL	FL_ADRS	;Save as current address.
AND	#04000h	;Get array start address.

A-6 PRELIMINARY