NRF52811-QCAA-R7 datasheet(243/444 Pages) NORDIC

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Peripherals

6.14.16.10 Jitter

Symbol

Description

Min.

Typ.

Max.

Units

tDISABLEDJITTER

Jitter on DISABLED event relative to END event when

shortcut between END and DISABLE is enabled

0.25

µs

tREADYJITTER

Jitter on READY event relative to TXEN and RXEN task

0.25

µs

6.14.16.11 IEEE 802.15.4 energy detection constants

Symbol

Description

Min.

Typ.

Max.

Units

ED_RSSISCALE

Scaling value when converting between hardware-reported

value and dBm

ED_RSSIOFFS

Offset value when converting between hardware-reported

value and dBm

-92

6.15 RNG — Random number generator

The Random number generator (RNG) generates true non-deterministic random numbers based on

internal thermal noise that are suitable for cryptographic purposes. The RNG does not require a seed

value.

Random number

generator

START

STOP

VALRDY

VALUE

Figure 88: Random number generator

The RNG is started by triggering the START task and stopped by triggering the STOP task. When started,

new random numbers are generated continuously and written to the VALUE register when ready. A

VALRDY event is generated for every new random number that is written to the VALUE register. This means

that after a VALRDY event is generated the CPU has the time until the next VALRDY event to read out the

random number from the VALUE register before it is overwritten by a new random number.

6.15.1 Bias correction

A bias correction algorithm is employed on the internal bit stream to remove any bias toward '1' or '0'. The

bits are then queued into an eight-bit register for parallel readout from the VALUE register.

It is possible to enable bias correction in the CONFIG register. This will result in slower value generation,

but will ensure a statistically uniform distribution of the random values.

6.15.2 Speed

The time needed to generate one random byte of data is unpredictable, and may vary from one byte to

the next. This is especially true when bias correction is enabled.

4454_140 v1.0

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