Data bus displacement device and method for prosecuting data bus displacement

Abstract

The present invention provides a turn device of a data bus, and method of executing the data bus turn, including: multiple exclusive or circuits, connecting to a real-time data bus and a new data bus, two data bus includes corresponding multi-bit data, multiple exclusive or circuits are used for executing bitwise comparison of two data bus, providing an exclusive or data bus, the data of the exclusive or data bus shows that the data bit corresponding to the real-time data bus and the new data bus whether identical or not; a bus state monitor, connecting to the exclusive or data bus, counting the bit numbers of the different data states in the corresponding multiple-bit data, showing whether the data of the real-time data bus is needed to turn or not, the bus state monitor further includes: multiple lsl circuits, used for ensuring the input signal process lsl circuits according to the turn signal, ensuring the output signal of each lsl circuit showing the data bit numbers of the different data states in the corresponding a group of multi-bit data.

Description

technical field [0001] The present invention relates to the field of microelectronics, and more specifically, relates to a device and method for performing data bus inversion in a microprocessor. Background technique [0002] Today's computer systems mainly rely on high-speed parallel buses to transmit addresses, data, control signals, and input and output information. For example, X86 compatible microprocessor uses the famous synchronous four-pump data bus, which divides 64-bit bus data into 4 groups of sub-signals, and each group contains 16 bits. Each group of sub-signals is generally transmitted separately through different paths of the main board, and includes its own source strobe signal and bus index signal. The source strobe signal is gated by the transmit signal on the bus to indicate that the data or information of this group of sub-signals is valid. The bus inversion signal indicates that the transmitted data is transmitted in one's complement form. That is to ...

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Problems solved by technology

Typically, this last bit cannot be simply ignored and will cause power consumption and noise on the bus

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