CC1010-RTY1 datasheet(78/152 Pages) TI

78 / 152 page

CC1010

SWRS047

Page 78 of 152

CRPINIn, n

∈{0..7} (0xB4-0xB7, 0xBC-0xBF) - DES Initialisation Vector

Bit

Name

R/W

Reset value

Description

7:0

CRPINIn

(7:0)

R/W

0x00

The 8 registers

CRPINIn, n ∈{0..7}, contains the 64

bit DES initialisation vector. Bits 8

⋅n-1 down to 8⋅n are

located in register

CRPINIn

16.10 Random Bit Generation

CC1010 can generate real random bit

sequences to be used as encryption keys,

seed for a software pseudo random

generator or other purposes. The data is

generated from amplifying noise in the RF

receiver path.

To enable random bit generation, set

RANCON.RANEN

and

clear

RFMAIN.RX_PD. Wait at least 1 ms before

reading data from RANCON.RANBIT. The

period between reads should be at least

µs for the data to be as random as

possible.

For applications requiring guaranteed DC

free data, software should process the

generated data, for example by xor'ing two

successive bits.

The random data generated has a

relatively white spectrum, but tones have

been observed when the random bit

generator has been enabled for more than

one second. If this is not sufficient for the

application to generate the random bits

required, the random bit generator should

be disabled and enabled following the

procedure

described

above

before

generating more data.

RANCON (0xC7) - Random Bit Generator Control Register

Bit

Name

R/W

Reset value

Description

7:2

0x00

Reserved, read as 0

RANEN

R/W

Random Bit Generator Enable

0 : Random Bit Generator is disabled.

1 : Random Bit Generator is enabled.

RFMAIN.RX_PD

must also be cleared to generate random bits.

RANBIT

RANBIT returns one random bit, generated from the RF

receiver path.

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