NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1242 / 1379

48.1.3.3.23.2 Function
The TRNG0 Statistical Check Run Length 5 Counters Register is a read-only register
used to read the final Run Length 5 counts after entropy generation. These counters start
with the value in TRNG0_SCRxC5L[RUN5_MAX]. The R5_1_CT decrements each
time five consecutive ones are sampled (preceded by a zero and followed by a zero). The
R5_0_CT decrements each time five consecutive zeroes are sampled (preceded by a one
and followed by a one). Note that this offset (0x34) is used as TRNG0_SCRxC5L if
TRNG0_MCTL[PRGM] is 1. If TRNG0_MCTL[PRGM] is 0, this offset is used as
TRNG0_SCRxC5C readback register, as described here.
48.1.3.3.23.3 Diagram
Bits 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
Reserved
R5_1_CT
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
Reserved
R5_0_CT
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
48.1.3.3.23.4 Fields
Field Function
31-27
—
Reserved. Always 0.
26-16
R5_1_CT
Runs of One, Length 5 Count. Reads the final Runs of Ones, length 5 count after entropy generation.
Requires TRNG0_MCTL[PRGM] = 0.
15-11
—
Reserved. Always 0.
10-0
R5_0_CT
Runs of Zero, Length 5 Count. Reads the final Runs of Ones, length 5 count after entropy generation.
Requires TRNG0_MCTL[PRGM] = 0.
48.1.3.3.24 TRNG0 Statistical Check Run Length 5 Limit (TRNG0_SCR5L)
Standalone True Random Number Generator (SA-TRNG).
K32 L2A Reference Manual, Rev. 2, 01/2020
1242 NXP Semiconductors