AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 1087

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

44. True Random Number Generator (TRNG)
44.1
6438F–ATARM–21-Jun-10
Description
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 44-1. TRNG Data Generation Sequence
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
AT91SAM9G45
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