Datasheet

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TMS320C6472

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SPRS612G–JUNE 2009– REVISED JULY 2011

3.6.3 Key-Based Protection for HOSTPRIV and PRIVPERM Registers (PRIVKEY)

Key-based protection of HOSTPRIV and PRIVPERM is provided for a higher level of protection or control

over changing the permission levels. The PRIVKEY register, shown in Figure 3-7 and described in

Table 3-13, is needed to service the key requirement. Updates to the HOSTPRIV and PRIVPERM

registers are only allowed when PRIVKEY contains the lower 16-bit key value (BEA7h). Protection is

provided by a following write to PRIVKEY to clear the register. The PRIVKEY is a 32-bit register with the

lower 16 bits as key field and upper 16 bits reserved to 0.

31 16

Reserved

R/W-0000 0000 0000 0000

15 0

KEY

R/W-0000 0000 0000 0000

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Figure 3-7. Key-Based Protection Register (PRIVKEY)

Table 3-13. Key-Based Protection Register (PRIVKEY) Field Descriptions

Bit Field Value Description

31:16 Reserved Reserved

15:0 KEY Key (BEA7h). These fields, [15:0], get updated only when KEY = BEA7h. Returns 0000h on read.

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