3.3.2. Interrupt Controller Type Register

The ICDICTR characteristics are:

Purpose

Provides information about the configuration of the Interrupt Controller.

Usage constraints

There are no usage constraints.

Configurations

Available in all Cortex-A9 MPCore configurations.

Attributes

See the register summary in Table 3.1.

Figure 3.3 shows the ICDICTR bit assignments.

Figure 3.3. ICDICTR bit assignments

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Table 3.4 shows the ICDICTR bit assignments.

Table 3.4. ICDICTR bit assignments

BitsNameFunction
[31:16]-Reserved
[15:11]LSPI

Returns the number of Lockable Shared Peripheral Interrupts (LSPIs) that the controller contains. The encoding is:

b11111 = 31 LSPIs, that are the interrupts of IDs 32-62.

When CFGSDISABLE is HIGH, the interrupt controller prevents writes to any register location that controls the operating state of an LSPI.

[10]SecurityExtn

Returns the number of security domains that the controller contains:

1 = the controller contains two security domains.

This bit always returns the value one.

[9:8]-Reserved
[7:5]CPU number

The encoding is:

b000 the Cortex-A9 MPCore configuration contains one Cortex-A9 processor.

b001 the Cortex-A9 MPCore configuration contains two Cortex-A9 processors.

b010 the Cortex-A9 MPCore configuration contains three Cortex-A9 processors.

b011 the Cortex-A9 MPCore configuration contains four Cortex-A9 processors.

b1xx: Unused values.

[4:0]IT lines number

The encoding is:

b00000 = the distributor provides 32 interrupts[a], no external interrupt lines.

b00001 = the distributor provides 64 interrupts, 32 external interrupt lines.

b00010 = the distributor provides 96 interrupts, 64 external interrupt lines.

b00011 = the distributor provide 128 interrupts, 96 external interrupt lines.

b00100 = the distributor provides 160 interrupts, 128 external interrupt lines.

b00101 = the distributor provides 192 interrupts, 160 external interrupt lines.

b00110 = the distributor provides 224 interrupts, 192 external interrupt lines.

b00111 = the distributor provides 256 interrupts, 224 external interrupt lines.

All other values not used.

[a] The distributor always uses interrupts of IDs 0 to 31 to control any SGIs and PPIs that the Interrupt Controller might contain.


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