On-chip bus encoding based on combined unequal error protection (UEP) with crosstalk avoidance coding (CAC)

Abstract

The invention provides a comprehensive code based on combined unequal error protection (UEP) with crosstalk avoidance coding (CAC). Aiming at a message packet structure based on a store-and-forward routing policy of network on chip (NoC), by means of regulating the linear dependence of a check matrix (H matrix), an unequal error protection code has capacities of double-bit adjacent error detection (DAED) and single-bit error correction (SEC) for information, and also has a capacity of double-bit error correction for packet heads, thus preferably protecting the important routing information contained in the packet heads. The unequal error protection code is in cascade connection with the CAC at the rear end, thus avoiding transition of a bus with long time delay and high power consumption, thereby preferably improving the influence of the crosstalk on the power consumption and time delay of the bus. According to the invention, based on a unified coding frame, the unequal error protection code is combined with the CAC to obtain the comprehensive code (called an SEC-DAED-selective double adjacent error correction (SDAEC)+ duplicate-add-parity (DAP) code). The comprehensive code has the error control characteristic of the unequal error protection code and the crosstalk avoidance characteristic of the CAC.

Description

technical field [0001] The invention belongs to the application technical field of on-chip network and integrated circuit design, in particular on-chip bus coding design based on on-chip network. Background technique [0002] In the deep submicron (DSM) system-on-chip (SoC) design, due to the influence of crosstalk between lines, the global interconnect bus generates a great delay and power consumption, and crosstalk noise and electromagnetic interference make the on-chip bus extremely prone to erroneous transmission . At the same time, ionizing radiation produced by high-energy neutrons and alpha particles can trigger single-event upset events (SEUs), causing bit flips in serial logic such as routing buffers, memory cells, and registers. Network on Chip (NoC) is the development direction of SoC in the future. High-speed, reliable and low-power communication between cores is the key to the design of NoC bus. Bus coding is an effective means to improve power consumption, de...

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Problems solved by technology

But the SEC-DAED-SDAEC code does not have crosstalk avoidance properties

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