LAR AR0,#MAXFLW Cmpr | Texas Instruments TMS320F20x/F24x DSP

REGS

FL_ST

BASE_0 AR6,#D10 DELAY,*,AR6

ARRAY

;ACCESS FLASH REGS

;ACC => SEG_CTR.

;Activate MODE.

;SET DELAY ;WAIT

;ACCESS FLASH ARRAY

Assembly Source for Algorithms

PRELIMINARY

LAR	AR0,#MAX_FLW
CMPR	2	;If AR1>MAX_FLW then
BCND	EXIT,TC	;Fail, don't continue recovery.
B	INV_ERASE	;Else, perform iverase again.

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

* SET_MODE: This routine sets the flash in the * * mode specified by the contents of BASE_0. This * * can be used for VER0,VER1,INVERASE,or STOP. *

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

SET_MODE CALL LACL TBLW LAR CALL CALL

RET

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

.end

A-18	PRELIMINARY

Image 70

Texas Instruments TMS320F20x/F24x DSP manual LAR AR0,#MAXFLW Cmpr, Setmode Call Lacl Tblw LAR Call Call RET

Contents

Literature Number SPRU282 September Important Notice Read This First Preliminary Related Documentation From Texas Instruments Preliminary If You Need Assistance Viii Contents Contents Figures Tables Introduction Basic Concepts of Flash Memory Technology TMS320F20x/F24x Flash Module ±1. TMS320 Devices With On-Chip Flash Eeprom ±1. TMS320F20x/F24x Program Space Memory Maps Benefits of Embedded Flash Memory in a DSP System Preliminary Flash Operations and Control Registers Topic Preliminary Flash Operations and Control Registers ±1. Flash Memory Logic Levels During Programming and Erasing Accessing the Flash Module ±2. Memory Maps in Register and Array Access Modes 1 TMS320F206 Flash Access-Control Register 2 TMS320F24x Flash Access-Control Register OUT Flash Module Control Registers Segment Control Register Segctr ±3. Segment Control Register Field Descriptions Flash Test Register TST Write Address Register Wadrs Write Data Register Wdata Read Modes Program Operation Erase Operation Recovering From Over-Erasure Flash-Write Operation Reading From the Flash Array Protecting the Array Algorithm Implementations Software Considerations How the Algorithms Fit Into the Program-Erase-Reprogram Flow ±1. Algorithms in the Overall Flow Programming or Clear Algorithm ±2. The Programming Algorithm in the Overall Flow Preliminary ±3. Programming or Clear Algorithm Flow Step Action Description Mask the data to program Preliminary Erase Algorithm ±4. Erase Algorithm in the Overall Flow ±2. Steps for Applying One Erase Pulse Preliminary ±5. Erase Algorithm Flow Flash-Write Algorithm ±6. Flash-Write Algorithm in the Overall Flow ±3. Steps for Applying One Flash-Write Pulse ±7. Flash-Write Algorithm Flow Preliminary Preliminary Assembly Source Listings Program Examples Assembly Source for Algorithms Header File for Constants and Variables, SVAR20.H BASE+0 ErrorBASE0 BASE1 D7K ConstantsD5K Dloop Segend Clear Algorithm, SCLR20.ASMSegst Protect AR0 Gclr PROTECT,SEGST,SEGEND DELAY,REGS,ARRAYSplk #0,ERROR AR1 Lacl Fladrs Exit Splk #1,ERRORSacl Flst Newrow Shutdown Write Operation Tblw SPAD1 Execute Command LAR Activate Write BIT Tblw SPAD1 Execute Command LARSET Delay Call DELAY,*,AR6 Wait Stop Write Operation Splk Tblr Fldata Lacl BASE2 Tblw SPAD1 Execute Command LARPrgbyte Call SETRDVER0 Bcnd PBDONE,EQ Erase Algorithm, SERA20.ASM Inverse Erase Command Word Erase Command WordErase Exebin Command Word Flash Write Command Word Call Setmode Clrc OVMSacl Flend Xorerase Bldd Splk #STOP,BASE0Inverase Splk #INVER,BASE0 Call Setmode Nextivers Lacl BASE1 Flash Stop command, and Ffff for Wdata Flash-Write Algorithm, SFLW20.ASM Flws MaxflwBldd #FLST,BASE1 Bcnd Call Array Access Flash Array DoneCall DELAY,*,AR6 Flwrite Splk LAR AR0,#MAXFLW Cmpr Setmode Call Lacl Tblw LAR Call Call RET Programming Algorithm, SPGM20.ASM AR4 PROTECT,DELAY,REGS,ARRAYAR3 Gpgmj Mask ALL Interrupts Setc Intm Globally Mask ALL Interrupts Splk #0,ERRORGpgmj Splk SUB Sacl BASE4 Lacl Fladrs Newrow Rowdone Lacl FladrsBcnd DONE, GT Adjrow NEG Shut Down Write Operation Tblw SPAD1 Execute Command LAR SETRDVER0 Call Regs Access Flash Registers Bcnd PBEND,EQ XOR FldataPbend RET Subroutines Used By All Four Algorithms, SUTILS20.ASM OUT SPAD2,F24XACCS OUT SPAD2,FACCESS0SPAD2,FACCESS1 Lacc Flst SUB Callable Interface to Flash Algorithms PARMS+1 GclrSEGST,SEGEND,PROTECT PARMS+2 Arstack Lacl ErrorErsparams Arprotect LAR AR1,SVAR1 Sacl ErscountCall Flws 1PROTECT Popd *+ Call Gpgmj Sample Assembly Code to Erase and Reprogram the TMS320F206 Assembly Code for TMS320F206 PARMS+1 SUB Memory Psaram Block B2Sections DLY Psaram Sample C Code to Erase and Reprogram the TMS320F206 Linker Command File for TMS320F206 Sample C Code BLKB2 FLASH0FLASH1 Block B2 Dsaram Sample Assembly Code to Erase and Reprogram the TMS320F240 Assembly Code for TMS320F240 CKCR0 RticrWdcr CKCR1 Sacl Syssr LDP #DPPF1PORRST, PLLRST, Illrst SWRST, Wdrst Lacl Syssr Accl = Syssr LDP #PARMS Splk Daram LDP #PARMS Extram Linker Command File for TMS320F240 Sample Assembly CodeB0PGM Extram 0 /******Delay Subroutine Rev1.003/98 JGC Linker Command File for TMS320F240 Sample C Code Block B2 Dsram B0DAT Compute Length Function for Disabling TMS320F240 Watchdog TimerLacl Wdcr Pshd Functions for Initializing the TMS320F240Sacl Wdcr Syscr Sacl Wdtcr Index Assembly code SERA2x.ASM Described 10 to Margin Role in single program pulse WRITE/ERASE field Described