Interface conversion circuitry for universal chiplet interconnect express (UCIe)
An integrated circuit (IC) chip includes a Universal Chiplet Interconnect express (UCIe) interface circuit for transferring UCIe signals. The UCIe interface circuit includes a mainband sub-interface for transferring mainband signals and a sideband sub-interface for transferring sideband signals along a first number of sideband signal paths. A bump interface includes a second number of sideband bumps, each of the sideband bumps for coupling to a signal link. The second number of sideband bumps is less than the first number of sideband signal paths. A converter circuit is disposed between the UCIe interface circuit and the bump interface. The converter circuit includes a receiver circuit to receive first sideband data from the sideband sub-interface. The receiver circuit includes local clock circuitry, oversampling circuitry, and majority detection circuitry to receive oversampled data and to resolve states of sideband data bits based on a majority voting process.
1. An integrated circuit (IC) chip, comprising:
a Universal Chiplet Interconnect express (UCIe) interface circuit to transfer signals in accordance with a UCIe protocol, the UCIe interface circuit comprising
a mainband sub-interfaces to transfer mainband signals, and
a sideband sub-interface to transfer sideband signals along a first number of sideband signal paths;
a bump interface comprising a second number of sideband bumps, each of the second number of sideband bumps to couple to a signal link, wherein the second number of sideband bumps is less than the first number of sideband signal paths; and
a converter circuit disposed between the UCIe interface circuit and the bump interface, the converter circuit comprising
a receiver circuit to receive first sideband data from the sideband sub-interface via the converter circuit, the first sideband data received from off-chip via a first link, the receiver circuit comprising
local clock circuitry to generate a sampling signal;
oversampling circuitry to oversample the first sideband data in response to the sampling signal to generate oversampled data; and
majority detection circuitry to receive the oversampled data and to resolve states of bits of the first sideband data based on a majority voting process carried out by the majority detection circuitry.
2. The IC chip of claim 1 , wherein:
the receiver circuit receives the first sideband data from a second IC chip via the first link.
3. The IC chip of claim 2 , further comprising:
a locked-loop circuit to generate the sampling signal based on a reference clock, the reference clock common to the IC chip and the second IC chip.
4. The IC chip of claim 2 , further comprising:
a sideband transmit circuit to transmit solely second sideband data to the second IC chip without an accompanying sideband clock.
5. The IC chip of claim 4 , wherein:
the sideband transmit circuit is configured to transmit the second sideband data along the first link.
6. The IC chip of claim 5 , wherein:
the sideband transmit circuit transmits the second sideband data along the first link concurrently with the receiver circuit receiving the first sideband data along the first link.
7. The IC chip of claim 1 , wherein:
the receiver circuit receives solely sideband data without an accompanying clock from the sideband sub-interface via the converter circuit.
8. The IC chip of claim 1 , wherein:
the first sideband data is received as return-to-zero (RZ) data.
9. A chiplet-based multi-chip module (MCM), comprising:
a first integrated circuit (IC) chiplet comprising
a first Universal Chiplet Interconnect express (UCIe) interface to transfer signals along a first number of signal paths in accordance with a UCIe protocol, the UCIe interface comprising
a mainband sub-interface for to transfer mainband signals, and
a sideband sub-interface to transfer sideband signals along a first number of sideband signal paths; and
a first converter interface to convert the first number of signal paths to a second number of signal paths that is less than the first number of signal paths; and
a second IC chiplet comprising
a second converter interface coupled to the first converter interface via a number of links that correspond to the second number of signal paths, the second converter interface comprising
a receiver circuit to receive first sideband data from the second converter interface, the receiver circuit comprising
local clock circuitry to generate a sampling signal;
oversampling circuitry to oversample the first sideband data in response to the sampling signal to generate oversampled data; and
majority detection circuitry to receive the oversampled data and to resolve states of bits of the first sideband data based on a majority voting process carried out by the majority detection circuitry.
10. The chiplet-based MCM of claim 9 , further comprising:
a locked-loop circuit to generate the sampling signal based on a reference clock, the reference clock common to the first IC chiplet and the second IC chiplet.
11. The chiplet-based MCM of claim 9 , further comprising:
a sideband transmit circuit to transmit solely second sideband data to the second IC chiplet via a first one of the number of links without an accompanying sideband clock.
12. The chiplet-based MCM of claim 11 , wherein:
the sideband transmit circuit is configured to transmit the second sideband data along the first one of the number of links.
13. The chiplet-based MCM of claim 12 , wherein:
the sideband transmit circuit transmits the second sideband data along the first one of the number of links concurrently with the receiver circuit receiving the first sideband data along the first one of the number of links.
14. The chiplet-based MCM of claim 9 , wherein:
the receiver circuit receives solely sideband data without an accompanying clock via the second converter interface.
15. The chiplet-based MCM of claim 9 , wherein:
the first sideband data is received as return-to-zero (RZ) data.
16. An interface conversion circuit, comprising:
conversion circuitry coupled to a Universal Chiplet Interconnect express (UCIe) interface, the conversion circuitry to receive first sideband data in accordance with a UCIe protocol from a second interface conversion circuit, the conversion circuitry comprising
a receiver circuit to receive the first sideband data from the second interface conversion circuit, from off-chip via a first link, the receiver circuit comprising
local clock circuitry to generate a sampling signal;
oversampling circuitry to oversample the first sideband data in response to receiving the sampling signal to generate oversampled data; and
majority detection circuitry to receive the oversampled data and to resolve states of bits of the first sideband data based on a majority voting process carried out by the majority detection circuitry.
17. The interface conversion circuit of claim 16 , wherein:
the conversion circuitry comprises a micro-bump interface array; and
the second interface conversion circuit comprises a standard bump interface array.
18. The interface conversion circuit of claim 17 , realized as a dynamic random access memory (DRAM) IC chip.
19. The interface conversion circuit of claim 17 , realized as a logic IC chip.