3.6 Configuration register, TRNG_CONFIG

The TRNG_CONFIG register controls the length of the inverter chain in the ring oscillator.

The following table lists the TRNG_CONFIG bit assignments.

Table 3-6 TRNG_CONFIG

Bits Name Description
[31:2] - Reserved.
[1:0] RND_SRC_SEL

Selects the number of inverters (out of four possible selections) in the ring oscillator (the entropy source):

0b00 = Selects the shortest inverter chain length. This is the reset value.

0b01 = Selects the short inverter chain length.

0b10 = Selects the long inverter chain length.

0b11 = Selects the longest inverter chain length.

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