RNG_ESR field descriptions (continued)
Field
Description
0
RNGB has not failed self test.
1
RNGB has failed self test.
1
OSCE
Oscillator error.
Indicates the oscillator in the RNG may be broken. This bit is sticky and can only be cleared by a software
or hardware reset.
0
RNG oscillator is working properly.
1
Problem detected with the RNG oscillator.
0
LFE
Linear feedback shift register (LFSR) error.
When this bit is set, the interrupt generated was caused by a failure of one of the LFSRs in one of the
RNGB's three entropy sources. This bit is sticky and can only be cleared by a software or hardware reset.
0
LFSRs are working properly.
1
LFSR failure has occurred.
33.3.6 RNGB Output FIFO (RNG_OUT)
The RNGBOUT provides temporary storage for random data generated by the RNGB.
This allows the user to read multiple random longwords back-to-back. A read of this
address when the FIFO is not empty, returns 32 bits of random data. If the FIFO is read
when empty, a FIFO underrun response is returned according to RNG_CR[FUFMOD].
For optimal system performance, poll RNG_SR[FIFO_LVL] to ensure random values are
present before reading the FIFO.
Address: RNG_OUT is 400A_0000h base + 14h offset = 400A_0014h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RNG_OUT field descriptions
Field
Description
31–0
RANDOUT
Random Output
Chapter 33 Random Number Generator (RNGB)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
803
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