CC2480
9.4
9.4.1
Random Number Generator
Introduction
The random number
following features.
generator has
the
The random number generator is a 16-bit
Linear Feedback Shift Register (LFSR) with
+ X + X + 1 (i.e. CRC16).
polynomial X
?
Generate pseudo-random bytes which can
be read by the external microprocessor.
16 15 2
It uses different levels of unrolling depending
on the operation it performs. The basic version
(no unrolling) is shown in Figure 8.
15
+
14
13
12
11
10
9
8
7
6
5
4
3
2
+
1
0
in_bit
+
Figure 8: Basic structure of the Random Number Generator
9.4.2
Semi random sequence generation
The operation is to clock the LFSR once (13x
leads to the availability of a fresh pseudo-
unrolling)
each time the external
random byte from the LSB end of the LFSR.
microprocessor reads the random value. This
CC2480 Data Sheet SWRS074
Page 27 of 43
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