TMS320DM647_09 Datasheet, PDF (43/181 Pages) Texas Instruments – Digital Media Processor

TMS320DM647
TMS320DM648
www.ti.com
SPRS372F – JANUARY 2010 – REVISED SEPTEMBER 2009
3.2.5 KEY_REG (write protection)
KEY_REG protects against accidental writes to certain system configuration registers. The complete set of
registers protected by the KEY_REG is:
• PINMUX
• BOOTCFG
• PRI_ALLOC
• CFGPLL
• CFGRX0
• CFGTX0
• CFGRX1
• CFGTX1
• MAC_ADDR_RW0
• MAC_ADDR_RW1
Writes to these registers are locked/blocked by default. To enable writes to these registers, write
0xADDDECAF to the KEY_REG. After enabling writes to protected registers by doing the above, the
register writes should occur within 10000 CPU/6 cycles, after which the key will be reset.
Figure 3-5. KEY_REG
31
0
KEY_REG
W-0x00000000
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
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Device Configuration
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