NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1239 / 1379

48.1.3.3.20.4 Fields
Field Function
31-29
—
Reserved. Always 0.
28-16
RUN3_RNG
Run Length 3 Range. The number of runs of length 3 (for both 0 and 1) detected during entropy
generation must be greater than RUN3_MAX - RUN3_RNG, else a retry or error will occur. This register
is cleared to the default POR value by writing the TRNG0_MCTL[RST_DEF] bit to 1.
15-13
—
Reserved. Always 0.
12-0
RUN3_MAX
Run Length 3 Maximum Limit. Defines the maximum allowable runs of length 3 (for both 0 and 1)
detected during entropy generation. The number of runs of length 3 detected during entropy generation
must be less than RUN3_MAX, else a retry or error will occur. This register is cleared to the default POR
value by writing the TRNG0_MCTL[RST_DEF] bit to 1.
48.1.3.3.21 TRNG0 Statistical Check Run Length 4 Count (TRNG0_SCR4C)
48.1.3.3.21.1 Address
Register Offset Description
TRNG0_SCR4C 400A5030h Accessible at this address when
TRNG0_MCTL[PRGM] = 0]
48.1.3.3.21.2 Function
The TRNG0 Statistical Check Run Length 4 Counters Register is a read-only register
used to read the final Run Length 4 counts after entropy generation. These counters start
with the value in TRNG0_SCRxC4L[RUN4_MAX]. The R4_1_CT decrements each
time four consecutive ones are sampled (preceded by a zero and followed by a zero). The
R4_0_CT decrements each time four consecutive zeroes are sampled (preceded by a one
and followed by a one). Note that this offset (0x30) is used as TRNG0_SCRxC4L if
TRNG0_MCTL[PRGM] is 1. If TRNG0_MCTL[PRGM] is 0, this offset is used as
TRNG0_SCRxC4C readback register, as described here.
Chapter 48 SA-TRNG Standalone
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 1239