Koninklijke Philips Corporation N.V.

St-ericsson Sa

Telefonaktiebolaget Lm Ericsson (publ)

Synopsys, Inc.

Nxp B.v.

Ericsson Modems Sa

Koninklijke Philips Electronics N.v.

Oct Circuit Technologies International Limited

Andrei Radulescu

Kees Gerard Willem Goossens

Peter Van Den Hamer

Bipin Balakrishnan

David R Evoy

Ewa Hekstra-Nowacka

Kees G W Goossens

Calin Ciordas

Cornelis Hermanus Van Berkel

Johannus Theodorus Matheus Hubertus Dielissen

Dennis Koutsoures

Edwin Rijpkema

Rikard Lennart Thid

Keese Gerard Willem Goossens

The present invention describes how to handle errors occurring during communication in a frame-based communication system that uses a communication protocol having a first error handling mechanism responsive to receipt of an incorrect protocol symbol. The invention provides a method and apparatus that allow several errors to occur without the communication system responding by initiating the first error handling mechanisms. Under circumstances where errors occur, the method and apparatus may improve throughput.

Efficient error handling on a link using ARQ and multiple nacks associated with multiple error thresholds

A system and method for minimizing power consumption in a transceiver circuit that uses a digital high-speed serial communications link between at least two devices is presented. Comma code matching is generally used as a means for establishing byte synchronization and for determining and preventing data transfer errors. However, comma code matching, when performed in high speed serial communications links that can transfer data at rate of giga-bits per second, can use a significant amount of power. Thus, the system and method described herein maintain comma code matching in an off-state, and transition comma code matching from an off-state to an on-state when a substantive operational change occurs in the serial communications link.

System and method for power saving modes in high speed serial interface communication systems utilizing selective byte synchronization

Systems and methods for handling a loss of message boundary in a real-time data transmission over an interconnect between a source node and a destination node are described. The destination node receives messages including one or more data frames. Each data frame includes an end-of-message flag, which is set when the data frame is last frame of a message, and a message sequence number, which is different for different messages. The destination node determines a loss of message boundary when a new data frame has a message sequence number different from the message sequence number of a previously received message, which did not have the end-of-message flag set. The destination node then transmits a synchronization loss message to the source node, and receives, as response, a status report message. The destination node is able to regain synchronization by determining a lost message boundary according to the status report message.

System and method to detect and communicate loss and retention of synchronization in a real-time data transfer scheme

Methods and devices for testing a physical layer (PHY) of an asymmetrical interconnect interface using a traffic generator/analyzer (TGA) are described. At least one special PHY test sequence is transmitted to the asymmetrical interconnect interface during link start up to place the device under test in PHY testing mode in which the TGA is used to generate and analyze data. The asymmetrical interconnect interface can then receive a configuration command and configure the asymmetrical interconnect interface in response to the configuration command. The asymmetrical interconnect interface can then use the TGA to transmit test sequences to, or receive test sequences from, e.g., a tester, on at least one identified lane of the asymmetrical interconnect device, which at least one identified lane is set by the configuration command.

Methods and systems for testing electrical behavior of an interconnect having asymmetrical link

An electronic device is provided which comprises a plurality of processing units (IP-IP), a network-based interconnect (N) coupled to the processing units (IP-IP) and at least one monitoring unit (PP) for monitoring a data flow of at least one first communication path between the processing units (IP-IP) and for forwarding monitoring results at least temporarily via at least two separate communication paths (MCMC).

Electronic device, system on chip and method for monitoring a data flow

A method for ensuring guaranteed services for real-time traffic on an interconnect with errors is provided. The real-time traffic comprises a first and second traffic class (HRT, SRT). Real-time traffic of the first and/or second traffic class (HRT, SRT) is transmitted from a transmitter to a receiver. It is detected by the receiver whether an error has occurred during the transmission of the real-time traffic and the error is reported to the transmitter. At least part of the real-time traffic of the second traffic class (SRT) is re-transmitted by the transmitter if the transmitter has received an error report from the receiver within a predetermined time period.

Electronic device and method of ensuring guaranteed services

Link startup systems, methods and devices associated with interconnects are described. Asymmetric lane connections are supported by, for example, independent renumbering of the connected lanes after an initial discovery process. Low-power, hibernating states of devices are supported by, for example, initialing alternating between transmission of startup and wakeup sequences over the interconnect between devices.

Methods and systems for reliable link startup

A method for transmitting data is described that includes the steps of: Producing a data frame for transmission, the data frame including a sequence number and user data, saving a copy of the data frame in a retransmission buffer, and if said step of saving a copy requires that data already present in the retransmission buffer is overwritten, selecting the one or more oldest data frames in the retransmission buffer to be overwritten, in case an error is determined in the received data frame, communicating an error message to the transmitter of the data frame, which error message at least comprises an indication of the sequence number of the last correctly received data frame,&#x2014;upon receipt of such message and if available, retransmitting one or more data frames from the retransmission buffer having a sequence number higher than the sequence number communicated in the message.

Method and apparatus of managing retransmissions in a wireless communication network

Disclosed are methods, and control devices () having programmable processors configured to implement methods, of communicating with a network () having an initially unknown topology and a plurality of unknown devices. The methods use set and get configuration commands to discover the unknown devices on the network using one or more host ports of the control device, enumerating the discovered devices by using the one or more host ports to assign a different network address to each discovered device, so that the enumerated devices correspond to the network topology.

Automatic network mapping from a host control device

A cut-through data packet mechanism is described. Forwarding of a cut-through data packet by an intermediary node enables packet transmission of the cut-through data packet to begin prior to performing a frame CRC on the packet. The CRC is instead performed while transmission of the packet is occurring. If one or more errors are found in the cut-through data packet, then a packet trailer indicating such errors is transmitted toward an endpoint node that receives the cut-through packet.

Reliable packet cut-through

A method of communicating between a transmitter and a receiver based on frames is provided. An error detection code is added to each frame to be transmitted by the transmitter. The frames to be transmitted by the transmitter are transmitted and the transmitted frames are received by the receiver. An error detection code is re-computed based on the received frames by the receiver. At least one frame which has been correctly received based on a comparison of the error detection code of each frame with the re-computed error detection code of each received frame is acknowledged. An error indication frame is sent by the receiver when an error is detected based on the comparison result. If a retransmission condition is detected by the transmitter by receiving an error indication frame from the receiver or if no acknowledgement frame was received by the transmitter from the receiver in a predetermined time interval, the currently transmitted frame is aborted and the transmitter inserts a trailer. As a further possibility instead of inserting a trailer, the start of re-transmission can be indicated by using a retransmission indicator.

Method of communication, in particular with capability of frame abortion or retransmission indication, between a transmitter and a receiver based on frames and corresponding communication node

An electronic device is provided which comprises a plurality of processing units (IP-IP), a network-based inter-connect (N) coupled to the processing units (IP-IP) and at least one monitoring unit (P, P) for monitoring a data flow of at least one first communication path between the processing units (IP-IP) and for forwarding monitoring results at least temporarily via at least two separate communication paths (MC, MC).

A data processor system includes a first data processor unit for transmitting data units to a second data processor unit and a retry buffer for temporarily storing transmitted data units. The second data processor unit receives the transmitted data and includes an error detector for detecting an error in the received data. When an error is detected, the first data processor unit is notified and a controller causes a data selector to select data from a retry buffer. The first data processor unit limits retransmission of a data unit to a predetermined maximum number of times irrespective of whether the data unit is correctly received or not. This allows for an undisturbed flow of streaming data with an increased reliability.

Data processor system and a method for communication data

A data processing system according to the invention comprising a group of at least a first and a second module, wherein each module has a data processing facility, a clock for timing data transmissions from the module to another module, a time-slot counter for counting a number of time slots which are available for transmission of data. The modules have a first operational state wherein the counted number of time slots is less than or equal to a predetermined number, in which operational state data transmission is enabled, and a second operational state wherein the number is in excess of the predetermined number, in which second operational state data transmission is disabled, Each module has a notifying facility for notifying when it is in the second operational state. The data processing system has at least one detecting facility that detects whether the other modules have notified that they are in the second operational state and the modules each have an initialization facility for resetting the time-slot counter when the module is in the second operational state and each of the other modules has notified that it is in the second operational state.

System and method for synchronising a data processing network

An integrated circuit includes a plurality of processing modules coupled by a network. A first processing module communicates with a second processing module based on transactions. A first wrapper means associated to the second processing module buffers data from the second processing module to be transferred over the network until a first amount of data is buffered and then transfers the first amount of buffered data to the first processing module.

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Eindhoven, Netherlands

Andrei Radulescu