Parallel data transmission method and parallel data transmission system

A data transmission system comprising:

• m signal lines;
• a transmitter for encoding data with a width of n bits (n is an integer equal to or greater than 2) into a data code with a width of m bits including equal or similar numbers of “1”s and “0”s selected, in accordance with predefined one-to-one correspondence, from 2m codes with the width of m bits (2n>m>n), and transmitting the encoded m-bit width code via the m signal lines;
• a receiver for receiving the m-bit width code transmitted from the transmitter and decoding the m-bit width data into an n-bit width data thereby obtaining received data.

A transmitter that encodes data with a width of n bits (n is an integer equal to or greater than 2) to be transmitted into a code with a width of m bits including equal or similar numbers of “1”s and “0”s selected, in accordance with predefined one-to-one correspondence, from 2m codes with the width of m bits (2n>m>n), and simultaneously transmits the encoded m-bit width code via m signal lines, the transmitter comprising:

• an encoder for encoding the data with the width of n bits to be transmitted into a code with a m bits;
• and
• m output drivers for outputting a high-level signal or a low-level signal depending on the m-bit data supplied from the encoder.

A transmitter that encodes data with a width of n bits (n is an integer equal to or greater than 2) to be transmitted into a code with a width of m bits including equal or similar numbers of “1”s and “0”s selected, in accordance with predefined one-to-one correspondence, from 2m codes with the width of m bits (2n>m>n), and simultaneously transmits the encoded m-bit width code via m signal lines, wherein the transmitter defines a null code by an arbitrary one of codes with a width of m bits including equal or similar numbers of “1”s and “0”s, which are not selected as data codes corresponding to the respective 2n codes, and, when there is no change in the n-bit transmit data over a period equal to or greater than two transfer clocks, the transmitter alternately transmits the encoded m-bit data code corresponding to the n-bit transmit data and the null code, the transmitter comprising:

• an encoder for encoding the data with the width of n bits to be transmitted into a code with a m bits;
• and
• m output drivers for outputting a high-level signal or a low-level signal depending on the m-bit data supplied from the encoder.