US 12,380,047 B2
Expanded data link width for main band chip module connection in alternate modes
Ravindranath Doddi, Hyderabad (IN); Umamaheshwaran V, Salem (IN); Afreen Haider, Muzaffarpur (IN); Lekhya Pavani Godavarthi, Hyderabad (IN); and Harinatha Reddy Ramireddy, Hyderabad (IN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jul. 14, 2023, as Appl. No. 18/352,600.
Prior Publication US 2025/0021504 A1, Jan. 16, 2025
Int. Cl. G06F 13/40 (2006.01); G06F 13/42 (2006.01)
CPC G06F 13/4018 (2013.01) [G06F 13/42 (2013.01)] 25 Claims
OG exemplary drawing
 
1. An apparatus comprising:
link initialization circuitry of a module of a first die configured to initialize a sideband of a die-to-die connection between a module and a module partner, the sideband having a receive data line and a transmit data line, wherein the sideband has a high reliability low data rate as compared to a main band of the die-to-die connection, wherein the main band comprises a plurality of data lines and a plurality of redundant data lines, wherein each redundant data line of the plurality of redundant data lines is configured to replace a failed data line of the plurality of data lines in response to a failure of the failed data line;
a sideband transmitter of the module configured to send a sideband initialization done message through the transmit line of the sideband,
wherein the link initialization circuitry is configured to initialize the main band in response to the initialization done message;
wherein the sideband transmitter is configured to send an expanded data link width enable request message including an enable parameter to the module partner through the transmit line of the sideband to set an expanded data link width of the main band, wherein the expanded data link width includes the data lines of the plurality of data lines and at least one redundant data line of the plurality of redundant data lines;
a sideband receiver of the module configured to receive an expanded data link width enable response message including the enable parameter from the module partner through the receive line of the sideband to set the expanded data link width of the main band,
wherein the link initialization circuitry is configured to initialize the at least one redundant data line as a main band line in response to receiving the expanded data link width enable response message and to train the main band using the expanded data link width; and
a main band transmitter configured to communicate data with the module partner through the main band using the expanded data link width.