TMS320F2811 datasheet(37/173 Pages) TI

37 / 173 page

Functional Overview

April 2001 − Revised July 2007

SPRS174O

Table 3−4. Boot Mode Selection

BOOT MODE SELECTED

GPIOF4

(SCITXDA)

GPIOF12

(MDXA)

GPIOF3

(SPISTEA)

GPIOF2

(SPICLK)

GPIO PU status†

No PU

Jump to Flash/ROM address 0x3F 7FF6

A branch instruction must have been programmed here prior to

reset to re−direct code execution as desired.

Call SPI_Boot to load from an external serial SPI EEPROM

Call SCI_Boot to load from SCI-A

Jump to H0 SARAM address 0x3F 8000

Jump to OTP address 0x3D 7800

Call Parallel_Boot to load from GPIO Port B

† PU = pin has an internal pullup No PU = pin does not have an internal pullup

‡ Extra care must be taken due to any effect toggling SPICLK to select a boot mode may have on external logic.

§ If the boot mode selected is Flash, H0, or OTP, then no external code is loaded by the bootloader.

3.2.11

Security

The F281x and C281x support high levels of security to protect the user firmware from being

reverse-engineered. The security features a 128-bit password (hardcoded for 16 wait states), which the user

programs into the flash. One code security module (CSM) is used to protect the flash/ROM/OTP and the L0/L1

SARAM blocks. The security feature prevents unauthorized users from examining the memory contents via

the JTAG port, executing code from external memory or trying to boot-load some undesirable software that

would export the secure memory contents. To enable access to the secure blocks, the user must write the

correct 128-bit ”KEY” value, which matches the value stored in the password locations within the Flash/ROM.

NOTE:

•

When the code-security passwords are programmed, all addresses between 0x3F7F80 and 0x3F7FF5

cannot be used as program code or data. These locations must be programmed to 0x0000.

•

If the code security feature is not used, addresses 0x3F7F80 through 0x3F7FEF may be used for code

or data.

•

On ROM devices, addresses 0x3F7FF2 − 0x3F7FF5 and 0x3D7BFC − 0x3D7BFF are reserved for TI,

irrespective of whether code security has been used or not. User application should not use these

locations in any way.

•

The 128−bit password (at 0x3F 7FF8 − 0x3F 7FFF) must not be programmed to zeros. Doing so would

permanently lock the device.

Table 3−5. Impact of Using the Code Security Module

ADDRESS

CODE SECURITY STATUS

Code security enabled

Code security disabled

0x3F7F80 − 0x3F7FEF

Fill with 0x0000

Application code and data†

0x3F7FF0 − 0x3F7FF5

Fill with 0x0000

Application code and data†

0x3D7BFC − 0x3D7BFF

Application code and data

† See the TMS320F2810, TMS320F2811, TMS320F2812, TMS320C2810, TMS320C2811, TMS320C2812 DSP Silicon Errata (literature number

SPRZ193) for some restrictions.

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