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NOSEQ input signal from the carrier board can be used to control output of the two DC-DC converters U1 and U3. It works in conjunction with the System Controller CPLD firmware controlled ON_1V0 and ON_1V8 input signals of the U21 and U25 gate ICs.
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| If NOSEQ input signal from the carrier board is low (logical 0), signals ON_1V0 and ON_1V8 can be driven by System Controller CPLD to control outputs of the U1 and U3 DC-DC converters. | If NOSEQ input signal from the carrier board is high (logical 1), state of the ON_1V0 and ON_1V8 signals is irrelevant and DC-DC converters U1 and U3 outputs are always enabled. |
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NB! Initial state of the ON_1V0 and ON_1V8 signals and therefore also functionality of the NOSEQ signal depend on the System Controller CPLD firmware. |
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