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Distributor Control Register

Characteristics and bit assignments of the ICDDCR.

PurposeControls whether the distributor responds to external stimulus changes that occur on SPIs and PPIs.
Usage constraintsThis register is banked. The register you access depends on the type of access:
Secure access
Distributor provides access to the Secure Enable and Non-secure Enable bits.
Non-secure access
Distributor provides access to the Non-secure enable bit only.

You cannot modify Enable Secure if CFGSDISABLE is set. You can modify Enable Non-secure even if CFGSDISABLE is set, through the S or the NS register.

ConfigurationsAvailable in all Cortex®‑A9 multiprocessor configurations.
AttributesSee the register summary in  Distributor register summary.

The following figure shows the ICDDCR bit assignments for Secure accesses.

Figure 3-1 ICDDCR bit assignments for Secure accesses


The following table shows the ICDDCR bit assignments for secure accesses.

Table 3-2 ICDDCR bit assignments for secure accesses

Bits Name Function
[31:2] - Reserved
[1] Enable Non-secure
0Disables all Non-secure interrupt control bits in the distributor from changing state because of any external stimulus change that occurs on the corresponding SPI or PPI signals.
1Enables the distributor to update register locations for Non-secure interrupts.
[0] Enable secure
0Disables all Secure interrupt control bits in the distributor from changing state because of any external stimulus change that occurs on the corresponding SPI or PPI signals.
1Enables the distributor to update register locations for Secure interrupts.

The following figure shows the ICDDCR bit assignments for Non-secure accesses.

Figure 3-2 ICDDCR bit assignments for Non-secure accesses


The following table shows the ICDDCR bit assignments for Non-secure accesses.

Table 3-3 ICDDCR bit assignments for Non-secure accesses

Bits Name Function
[31:1] - Reserved
[0] Enable Non-secure
0Disables all Non-secure interrupts control bits in the distributor from changing state because of any external stimulus change that occurs on the corresponding SPI or PPI signals.
1Enables the distributor to update register locations for Non-secure interrupts.
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