Bus code sending circuit and method and bus transmission system

Abstract

The invention provides a bus code sending circuit, a bus code sending method and a bus transmission system. The circuit comprises a phase arrangement unit and a delay processing unit which are connected in sequence. The phase arrangement unit can arrange the initial phase of each signal bit in the initial bus signal into the same phase. The delay processing unit performs delay processing accordingto the hopping direction of each signal bit in the initial bus signal, groups each signal bit in the sorted bus signal; wherein the grouped bus signals at least comprise two signal bit groups, and the hopping directions of the signal bits in any signal bit group are the same; and performing non-zero delay on all signal bit groups in the same hopping direction in the grouped bus signals accordingto a preset delay mode to obtain delayed bus signals, and sending the delayed bus signals to a bus decoding receiving circuit. According to the invention, on the premise that the wiring resource demand is not changed, the worst crosstalk condition is eliminated, and the transmission delay caused by crosstalk is reduced.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a bus encoding sending circuit and method, and a bus transmission system. Background technique [0002] In integrated circuit design, when transmitting a multi-bit data signal, such as 16-bit data or 32-bit data signal, etc., the bus mode is often used for transmission. Since the bus is a collection of signal lines, and one signal line transmits one bit of data, a signal that can transmit multiple bits of data through a set of signal lines is usually called a bus signal. [0003] Different from the signal transmission method of one bit data, the arrangement of each signal line for the transmission bus signal is relatively dense and neat, and the length of each signal line is the same, and the surrounding electromagnetic environment is similar, which is beneficial to the bus signal after it is sent from the sending end. Reach multiple receivers at the same time, with con...

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Problems solved by technology

Among them, increasing the spacing between adjacent signal lines can reduce the coupling capacitance, which in turn can reduce crosstalk. Specifically, the spacing between each signal line can be forcibly specified in the wiring, but it will take up too many routing resources, which is not suitable for wiring resources. Limited integrated circuits; space coding is to arrange a shielding line in parallel on both sides of each signal line to block the crosstalk intrusion of other signal lines, but there will still be coupling capacitance between the signal line and the shielding line; bus coding is usually based on The worst vector theory, adding an encoder at the sending end, the worst vector that the encoder will appear in the process of transmitting the bus signal (that is, the situation where the signal bits transmitted by adjacent signal lines are reversed at the same time), through The bus encoding method is treated as a non-worst vector, but the bus encoding method eliminates bus crosstalk and still increases redundant signal lines, thereby occupying too many routing resources

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