NXP Semiconductors K32 L2A Series, Reference Manual, Page: 1237 / 1379

48.1.3.3.19 TRNG0 Statistical Check Run Length 3 Count (TRNG0_SCR3C)
48.1.3.3.19.1 Address
Register Offset Description
TRNG0_SCR3C 400A502Ch Accessible at this address when
TRNG0_MCTL[PRGM] = 0]
48.1.3.3.19.2 Function
The TRNG0 Statistical Check Run Length 3 Counters Register is a read-only register
used to read the final Run Length 3 counts after entropy generation. These counters start
with the value in TRNG0_SCRxC3L[RUN3_MAX]. The R3_1_CT decrements each
time three consecutive ones are sampled (preceded by a zero and followed by a zero).
The R3_0_CT decrements each time three consecutive zeroes are sampled (preceded by a
one and followed by a one). Note that this offset (0x2C) is used as TRNG0_SCRxC3L if
TRNG0_MCTL[PRGM] is 1. If TRNG0_MCTL[PRGM] is 0, this offset is used as
TRNG0_SCRxC3C readback register, as described here.
48.1.3.3.19.3 Diagram
Bits 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
Reserved
R3_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
R3_0_CT
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
48.1.3.3.19.4 Fields
Field Function
31-29
—
Reserved. Always 0.
28-16
R3_1_CT
Runs of Ones, Length 3 Count. Reads the final Runs of Ones, length 3 count after entropy generation.
Requires TRNG0_MCTL[PRGM] = 0.
15-13 Reserved. Always 0.
Table continues on the next page...
Chapter 48 SA-TRNG Standalone
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 1237