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1. A data transmission system comprising:
a plurality of signal lines that transmit data transmitted from a transmission-side device to a reception-side device; a signal line determination unit that determines which signal line among the signal lines is used to transmit reception adjustment data to the reception-side device; and a data transmission unit that uses the signal line determined by the signal line determination unit to transmit the reception adjustment data to the reception-side device and uses another signal line to transmit transmission data to the reception-side device, wherein the reception-side device, when an adjustment bit is changed at an interruption of data transfer, makes a request for the adjustment bit and notifies, the signal line determination unit, of a bit which is desired to be assigned to the adjustment bit due to many errors together with adjustment completion “1” as a status indicating that the adjustment of the adjustment bit has been completed, and the signal line determination unit holds states of a transfer bit and the adjustment bit until the data transfer completes once, and after the data transfer is completed, transmits, to a reception data control unit, a switch command of instructing to switch assignments of the transfer bit and the adjustment bit, transmits, to the reception data control unit, a transmission command, switches the transfer bit and the adjustment bit, and restarts the data transmission after command-enabled cycles elapse since the transmission command is input.
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