TMS320F datasheet(29/389 Pages) TI

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Memory

2-6

2.3.2

Flash EEPROM

Flash EEPROM provides an attractive alternative to masked program ROM.

Like ROM, flash is a nonvolatile memory type; however, it has the advantage

in-target reprogrammability. The ’F24x incorporates one 16K/8K

× 16-bit

flash EEPROM module in program space. This type of memory expands the

capabilities of the ’F24x in the areas of prototyping, early field testing, and

single-chip applications.

Unlike most discrete flash memory, the ’F24x flash does not require a dedi-

cated state machine because the algorithms for programming and erasing the

flash are executed by the DSP core. This enables several advantages, includ-

ing reduced chip size and sophisticated adaptive algorithms. For production

programming, the IEEE Standard 1149.1 (JTAG) scan port provides easy ac-

cess to on-chip RAM for downloading the algorithms and flash code. Other key

features of the flash include zero-wait-state access rate and single 5-V power

supply.

An erased bit in the ’24x flash is read as a logic one, and a programmed bit is

read as a logic zero. The flash requires a block-erase of the entire 16K/8K

module; however, any combination of bits can be programmed. The following

four algorithms are required for flash operations: clear, erase, flash-write, and

program. For an explanation of these algorithms and a complete description

of the flash EEPROM, see

TMS320F20x/F24x DSPs Embedded Flash

Memory Technical Reference (Literature number SPRU282).

2.3.3

Flash Serial Loader

Most of the on-chip flash devices are shipped with a serial bootloader code

programmed at the following addresses: 0x0000 – 0x00FFh. All other flash ad-

dresses are in an erased state. The serial bootloader can be used to program

the on-chip flash memory with user’s code. During the flash programming se-

quence, the on-chip data RAM is used to load and execute the clear, erase,

and program algorithms.

2.3.4

Factory-Masked ROM

For large-volume applications consisting of stable software free of bugs, low-

cost, masked ROM is available and supported up to 16K or 4K words. If you

want a custom ROM, you can provide the code or data to be programmed into

the ROM in object-file format, and Texas Instruments will generate the ap-

propriate process mask to program the ROM. For details, see Appendix B,

Submitting ROM Codes to TI.

A small portion of the ROM (128 or 64 words) is reserved by Texas Instruments

for test purposes. These reserved locations are at addresses 0x3F80 or 3FC0

through 0x3FFF. This leaves about 16K words available for your code.

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