SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1319

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

42. True Random Number Generator (TRNG)
42.1
42.2
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Description
Embedded Characteristics
The True Random Number Generator (TRNG) passes the American NIST Special Publication
800-22 and Diehard Random Tests Suites.
As soon as the TRNG is enabled (TRNG_CTRL register), the generator provides one 32-bit
value every 84 clock cycles. Interrupt trng_int can be enabled through the TRNG_IER register
(respectively disabled in TRNG_IDR). This interrupt is set when a new random value is available
and is cleared when the status register is read (TRNG_SR register). The flag DATRDY of the
status register (TRNG_ISR) is set when the random data is ready to be read out on the 32-bit
output data register (TRNG_ODATA).
The normal mode of operation checks that the status register flag equals 1 before reading the
output data register when a 32-bit random value is required by the software application.
Figure 42-1. TRNG Data Generation Sequence
• Passed NIST Special Publication 800-22 Tests Suite
• Passed Diehard Random Tests Suite
• Provides a 32-bit Random Number Every 84 Clock Cycles
trng_cr
enable
trng_int
clock
84 clock cycles
Read TRNG_ODATA
Read TRNG_ISR
84 clock cycles
84 clock cycles
Read TRNG_ODATA
Read TRNG_ISR
SAM3X/A
SAM3X/A
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