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48.1.3.3.2.3 Diagram
Bits
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
Reserved
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
Reserved
W
w1c
Reset
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
48.1.3.3.2.4 Fields
Field
Function
31-17
—
Reserved.
16
PRGM
Programming Mode Select. When this bit is 1, the TRNG is in Program Mode, otherwise it is in Run
Mode. No Entropy value will be generated while the TRNG is in Program Mode. Note that different RNG
registers are accessible at the same address depending on whether PRGM is set to 1 or 0. This is noted
in the RNG register descriptions.
15-14
—
Reserved.
13
TSTOP_OK
TRNG_OK_TO_STOP. Software should check that this bit is a 1 before transitioning TRNG0 to low
power mode (TRNG0 clock stopped). TRNG0 turns on the TRNG free-running ring oscillator whenever
new entropy is being generated and turns off the ring oscillator when entropy generation is complete. If
the TRNG0 clock is stopped while the TRNG ring oscillator is running, the oscillator will continue running
even though the TRNG0 clock is stopped. TSTOP_OK is asserted when the TRNG ring oscillator is not
running. and therefore it is ok to stop the TRNG0 clock.
12
ERR
Read: Error status. 1 = error detected. 0 = no error.
Write: Write 1 to clear errors. Writing 0 has no effect.
11
TST_OUT
Read only: Test point inside ring oscillator.
10
ENT_VAL
Read only: Entropy Valid. Will assert only if TRNG ACC bit is set, and then after an entropy value is
generated. Will be cleared at most one (1) bus clock cycle after reading the TRNG0_ENT15 register.
(TRNG0_ENT0 through TRNG0_ENT14 should be read before reading TRNG0_ENT15).
9
FCT_VAL
Read only: Frequency Count Valid. Indicates that a valid frequency count may be read from
TRNG0_FRQCNT.
8
FCT_FAIL
Read only: Frequency Count Fail. The frequency counter has detected a failure. This may be due to
improper programming of the TRNG0_FRQMAX and/or TRNG0_FRQMIN registers, or a hardware failure
in the ring oscillator. This error may be cleared by writing a 1 to the ERR bit.
Table continues on the next page...
Standalone True Random Number Generator (SA-TRNG).
K32 L2A Reference Manual, Rev. 2, 01/2020
1218
NXP Semiconductors
Содержание K32 L2A Series
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