The reference RTC signal ports are described in the following table. These ports can be used for 1722 logic.
| Signal Name | Direction | Description |
|---|---|---|
| rtc_nanosec_field[31:0] | Out | The synchronized nanosecond field from the RTC. |
| rtc_sec_field[47:0] | Out | The synchronized second field from the RTC |
| clk8k | Out | An 8 kHz clock which is derived from and is synchronized to the RTC. The period of this clock, 125 us, marks the isochronous cycle. |