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diff --git a/README.txt b/README.txt new file mode 100644 index 0000000..017d5ae --- /dev/null +++ b/README.txt @@ -0,0 +1,20 @@ + +External Avalanche Entropy +-------------------------- +This is a test project of an entropy provider that collects entropy from +an avalanche noise based source. + +The design expects a one bit digital input noise signal. The collector +observes positive flank events in the input noise signa and measures the +time between these events using a counter. The counter is free running +and increases once for each clock cycle (currently running av 50 MHz). + +The LSB of the counter is added to a 32-bit entropy register at each +event. + +As debug output the entropy register is sampled at a given rate +(currently a few times per second). The debug output is connected to LED +on the FPGA development board. + +The project also contains project files, pin assignments and clock +definition neded to implement the design on a TerasIC DE0-Nano board. |