3.2.3. Lockdown Range Register

The lockdown_range Register characteristics are:

Purpose

Controls the range of regions that are locked down.

Usage constraints

The lockdown_select Register can restrict the access type of this register to RO. See Lockdown Select Register.

Configurations

Available in all configurations of the TZASC.

Attributes

See the register summary in Table 3.1.

Figure 3.4 shows the lockdown_range Register bit assignments.

Figure 3.4. lockdown_range Register bit assignments


Table 3.4 shows the lockdown_range Register bit assignments.

Table 3.4. lockdown_range Register bit assignments

BitsNameFunction
[31]enable

When set to 1, it enables the lockdown_regions field to control the regions that are to be locked

[30:4]-

Reserved, SBZ

[3:0]

lockdown_regions

Controls the number of regions to lockdown when the enable bit is set to 1:

b0000 = region no_of_regions [a]-1 is locked

b0001 = region no_of_regions-1 to region no_of_regions-2 are locked

b0010 = region no_of_regions-1 to region no_of_regions-3 are locked

b0011 = region no_of_regions-1 to region no_of_regions-4 are locked

  .

  .

  .

b1111 = region no_of_regions-1 to region no_of_regions-16 are locked.

[a] no_of_regions is the value of the no_of_regions field in the configuration Register. See Configuration Register.


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