Seemingly monolithic interface between separate integrated circuit die

A system comprising:

• a substrate;
• a first integrated circuit die mounted on the substrate, the first integrated circuit die comprising:
• sampling circuitry to sample a first portion of a plurality of signals more often than a second portion of the plurality of signals;
• and
• a transmitter to generate a serial signal based on the plurality of signals and transmit the serial signal, wherein a frame of the serial signal comprises a first time slot comprising a flag bit to indicate a state of a plurality of bits of the first time slot, a first plurality of time slots that comprise the first portion of the plurality of signals, and a second plurality of time slots that comprise the second portion of the plurality of signals, wherein the first plurality of time slots includes more time slots than the second plurality of time slots;
• and
• a second integrated circuit die mounted on the substrate, the second integrated circuit die comprising a receiver to receive, via the substrate, the serial signal from the first integrated circuit die.

A system comprising:

• a substrate;
• and
• a first integrated circuit die mounted on the substrate, wherein the first integrated circuit die comprises:
• sampling circuitry clocked to a clock, wherein the sampling circuitry is to:
• receive a plurality of signals comprising a signal and a second signal;
• sample the signal at a first sampling rate to produce a first plurality of sampled signals, wherein the signal is sampled over a sampling window that includes a plurality of edges of the clock, wherein the signal is sampled at least in part by:
• detecting a current state of the signal a defined number of times at edges of the clock;
• latching the signal when the current state is the same for the defined number of times;
• and
• outputting the latched signal into a sampling register;
• and
• sample the second signal of the plurality of signals at a second sampling rate to produce a second plurality of sampled signals, wherein the first sampling rate is a higher frequency than the second sampling rate;
• a transmitter to generate a serial signal based on the plurality of signals transmit the serial signal, wherein a frame of the serial signal comprises:
• a first plurality of time slots that comprises the first plurality of sampled signals;
• and
• a second plurality of time slots that comprises the second plurality of sampled signals.