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Altera_Forum's avatar
Altera_Forum
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15 years ago

Nios instability

Hello, I'm using nios II processor with a high_res_timer for different test before continuing my project. The test i'm trying to do is to generate on a pin a square frequency with a 400µs period...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The actual 'instability' is most likely caused by the amount of time the 'timestamp' value is above 100000.

This error will accumulate over time.

The error due to the 220 sys_clk cycles spent in alt_timestamp() would only cause jitter.

(It is that long because the hardware is implemented as two 16bit counter registers ...)