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@ -126,15 +126,19 @@ There is SHUTDOWN pin where FPGA can turn OFF the board.
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This pin is not correctly routed on PCB v1.7 and needs
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hardware upgrade to make it work.
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When board is ready to accept SHUTDOWN signal, LED D11
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(found on back side of the board near J1 pin 22) should
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When RTC has 3V battery and its registers for current time,
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alarm time and alarm logic are configured to trigger
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RTC ALARM in the future, the board is ready to accept
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SHUTDOWN signal, which is indicated when LED D11
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(found on back side of the board near J1 pin 22) is
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be very dimly lit, visible in the dark.
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While D11 is dimly lit, power down
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board by setting SHUTDOWN signal to 1
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(or shortly and carefully connect 1k resistor between SHUTDOWN pin of R13
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and 3.3V).
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When RTC ALARM is triggered, board should turn ON and D11 should be OFF
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indicating board can't enter SHUTDOWN until RTC ALARM flag is cleared.
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While D11 is dimly lit, board can be powered down by setting SHUTDOWN
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signal to 1 from FPGA logic or by shortly and carefully connecting 1k
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resistor between SHUTDOWN pin of R13 and 3.3V.
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When RTC ALARM is triggered, board should turn ON. When D11 is OFF,
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it is indicating that board can't enter SHUTDOWN, probably RTC ALARM
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flag has to be cleared or other RTC registers configured.
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On J2 connector there are 2 pins for 5V external power input
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and output. They are located on top right, near pin labeled 27
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