NRF9160-SICA-R7 datasheet(91/400 Pages) NORDIC

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Peripherals

• A secure peripheral access can control all the DPPI channels, independently of the SPU.DPPI.PERM[]

A group of channels can be created, making it possible to simultaneously enable or disable all channels

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

follows:

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

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

secure

A non-secure access to a DPPI register, or a bit field, controlling a channel marked as secure in

SPU.DPPI[].PERM register(s) will be ignored. Write accesses will have no effect, and read accesses will

always return a zero value.

No exceptions are triggered when non-secure accesses target a register or a bit field controlling a secure

channel. For example, if the bit

i is set in the SPU.DPPI[0].PERM register (declaring DPPI channel i as

secure), then:

• Non-secure write accesses to registers CHEN, CHENSET, and CHENCLR cannot write bit

i of these

registers

• Non-secure write accesses to TASK_CHG[j].EN and TASK_CHG[j].DIS registers are ignored if the channel

group

j contains at least one channel defined as secure (it can be the channel i itself or any channel

declared as secure)

• Non-secure read accesses to registers CHEN, CHENSET, and CHENCLR always read 0 for the bit at

position

For the channel configuration registers (CHG[]), access from non-secure code is only possible if the

included channels are all non-secure, whether the channels are enabled or not. If a CHG[g] register

included one or more secure channel(s), then the group

g is considered as secure, and only secure

transfers can read to or write from CHG[g]. A non-secure write access is ignored, and a non-secure read

access returns 0.

The DPPI can subscribe to secure and non-secure channels through the SUBSCRIBE_CHG[] registers, in

order to trigger the task for enabling or disabling groups of channels. An event from a secure channel will

be ignored if the group subscribing to this channel is non-secure. A secure group can subscribe to a non-

secure channel or a secure channel.

6.2.5 Registers

Base address Peripheral

Instance

Secure mapping

DMA security

Description

Configuration

0x50017000

0x40017000

DPPIC

DPPIC : S

DPPIC : NS

SPLIT

DPPI configuration

Table 33: Instances

4418_1315 v2.0

NRF9160-SICA-R7 Datasheet(PDF) 91 Page - Nordic Semiconductor

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