Data transfer by modulating clock signal

A system comprising:

• a crystal oscillator to generate a shared clock signal;
• a plurality of circuit dies having respective circuitry, the plurality of circuit dies including a first circuit die having:
• a real time clock (RTC) circuit to:
• receive a shared clock signal that is shared among the plurality of circuit dies;
• receive clock information associated with the shared clock signal;
• generate a modulated RTC signal based on the shared clock signal, wherein the modulated RTC signal is modulated using pulse width modulation to encode the clock information;
• and
• pass the modulated RTC signal to one or more other circuit dies of the plurality of circuit dies.

A circuit disposed on a first circuit die, the circuit comprising:

• a first input terminal to receive a shared clock signal from a second circuit die;
• a second input terminal to receive a modulated real time clock (RTC) signal that encodes clock information associated with the shared clock signal;
• and
• a decoder to decode the clock information from the modulated RTC signal.

An apparatus comprising:

• means to receive clock information associated with a shared clock signal that is to be used by a plurality of circuit dies, wherein the clock information includes temperature information;
• means to modulate a real time clock (RTC) signal with the clock information by adjusting a timing of a falling edge of the RTC signal, wherein the RTC signal has a frequency that is less than a frequency of the shared clock signal;
• and
• means to distribute the modulated RTC signal to the plurality of circuit dies.