82802AB datasheet(27/53 Pages) INTEL

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Intel

® 82802AB/AC Firmware Hub

Datasheet

4.9.3.

Random Number Generator Registers

When enabled and active, the Random Number Generator (RNG) is designed to fill an 8-bit register, a

bit at a time, with hardware-generated random numbers. When this register is full, a flag bit in the RNG

data status register transitions to a 1, indicating that a valid random number is ready to be read. This bit

will immediately reset to 0 upon reading the RNG data register.

The advantages of random numbers over pseudo-random numbers as well as a brief overview of the

simple mathematics of testing RNGs are discussed superficially in the companion document, The Intel®

Platform RNG Tech Brief, which is available online.

4.9.3.1.

RNG Hardware Status Register

Memory Address:

FFBC015Fh

Default Value:

40h, for typical component out of reset

Access:

Size:

8 bits

Bit

Function

Reserved

RNG Present—RO. Determines whether or not an RNG is present on this component, or if it has been

disabled.

1 = RNG Present

0 = RNG not present

5:1

Reserved

RNG Enabled—R/W. Determines whether the RNG is generating a random number.

1 = RNG enabled

0 = RNG disabled

4.9.3.2.

RNG Data Status Register

Memory Address:

FFBC0160h

Default Value:

00h

Access:

Size:

8 bits

Bit

Function

7:1

Reserved

RNG Output Valid. Determines whether the RNG data register contains a valid random number.

1 = RNG data register contians valid random data

0 = RNG data register contents not valid

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