Texas Instruments MSP50C614 Memory Overlay, These files may be edited for special purpose code

Texas Instruments C614 Synthesis Code

These files may be edited for special purpose code

INIT.ASM and SPEAK.ASM

These files should never be edited

SLEEP.ASM, RAM.IRX and SPK_RAM.IRX

A good rule of thumb to follow is that files under the DSP directory should be left alone, and all custom code should be added either to MAIN.ASM or to a new directory under MODULES, e.g., MODULES\CUSTCODE.

Creating a New Project

The easiest way to create a new project is to copy the entire MELP1 directory into another directory. Rename the project file as desired, eg NEWPROJ.RPJ. It is not necessary to change the paths of the files in the project ± this will be done automatically by the code development tool.

6.3.1Memory Overlay

C614 release code uses memory overlay to accommodate multiple synthesis algorithms. If the user is interested in using the data memory, the starting memory location has to start from the last memory location used by the program + 2. The synthesis code has a file named MAIN_RAM.IRX. This file is provided for maintaining overlay. New variables are added as follows:

; bytes
byte1	equ	RAMSTART_CUSTOMER + 1
byte2	equ	byte1 + 1
; words
word1	equ	byte2 + 2 * 1
word2	equ	word1 + 2 * 1
; byte arrays
array1	equ	word2 + 10
; word arrays
array2	equ	array1 + 2 * 4
; End of RAM
RAMEND_CUSTOMER	equ	array2
RAMLENGTH_CUSTOMER	equ	RAMEND_CUSTOMER ±
		RAMSTART_CUSTOMER

Two byte variables, two word variables and two arrays are assigned storage space in realtion to the previous variable. The last two rows must be present and the constant RAMEND_CUSTOMER should equate to the name of the last used variable in the list. Note that the C614 RAM is always accessed as byte, therefore 1 word memory location is equal to 2 bytes. Hence the multiplication by 2.

Applications 6-13