NRF9160-SICA-R7 datasheet(269/400 Pages) NORDIC

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Peripherals

The security attribute of a DPPI channel is configured in DPPI[n].PERM (n=0..0) on page 276. When the

secure attribute is set for a channel, only peripherals that have the secure attribute set will be able to

publish events to this channel or subscribe to this channel to receive tasks.

The DPPI controller peripheral (DPPIC) is a split security peripheral, i.e., its security behavior depends on

the security attributes of both the DPPIC and the accessing party. See Special considerations regarding the

DPPIC configuration registers on page 269 for more information about the DPPIC security behavior.

If a non-secure peripheral wants to publish an event on a secure DPPI channel, the channel will ignore the

event. If a non-secure peripheral subscribes to a secure DPPI channel, it will not receive any events from

this channel. The following figure illustrates the principle of operation of the security logic for a subscribed

channel:

SUBSCRIBE_XXXX

DPPI channel[0]

DPPI channel[n]

Security Attribute for DPPI channel [0]

Security Attribute for DPPI channel [n]

SPU.DPPI[].PERM

SPU.PERIPHID[id].PERM

SECATTR

Peripheral registers

Security

check

Event

(to peripheral core)

Figure 86: Subscribed channel security concept

No error reporting mechanism is associated with the DPPI access control logic.

6.15.6.1 Special considerations regarding the DPPIC configuration registers

DPPI channels can be enabled, disabled and grouped through the DPPI controller (DPPIC). The DPPIC is a

split-security peripheral, and handles both secure and non-secure accesses.

A non-secure peripheral access will only be able to configure and control DPPI channels defined as

non-secure in SPU's DPPI[n].PERM register(s). A secure peripheral access can control all DPPI channels,

independently of the configuration in the DPPI[n].PERM register(s).

The DPPIC allows the creation of group of channels to be able to enable or disable all channels within a

group simultaneously. The security attribute of a group of channels (secure or non-secure) is defined as

follows:

• If all channels (enabled or not) in the group are non-secure, then the group is considered non-secure

• If at least one of the channels (enabled or not) in the group is secure, then the group is considered

secure

A non-secure access to a DPPIC register, or a bitfield controlling a channel marked as secure in

DPPI[n].PERM register(s), will be ignored:

• Write accesses will have no effect

4418_1315 v2.0

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