n82802 Intel Corporation, n82802 Datasheet - Page 27

• Manufacturer Part Number: n82802
• Description: Firmware Hub Fwh
• Manufacturer: Intel Corporation

4.9.3.
4.9.3.1.
4.9.3.2.
Datasheet
R
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.
RNG Hardware Status Register
Memory Address:
Default Value:
Access:
Size:
RNG Data Status Register
Memory Address:
Default Value:
Access:
Size:
5:1
7:1
Bit
Bit
7
6
0
0
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
Reserved
RNG Enabled—R/W. Determines whether the RNG is generating a random number.
1 = RNG enabled
0 = RNG disabled
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
FFBC015Fh
40h, for typical component out of reset
RO
8 bits
FFBC0160h
00h
RO
8 bits
Function
Function
Intel
®
82802AB/AC Firmware Hub
27
®