Data transmission apparatus and method having clock gating mechanism

A data transmission method having clock gating mechanism and used in a data transmission apparatus, comprising:

• receiving a write clock signal to receive one of a plurality of data signals accordingly and receiving one of a plurality of read clock signals to output the corresponding one of the plurality of data signals accordingly by each of a plurality of data transmission circuits;
• receiving a write clock gating enabling signal to enable and disable the transmission of the write clock signal to the data transmission circuits by a write clock gating circuit;
• receiving one of a plurality of read clock gating enabling signals to enable and disable the transmission of one of the plurality of read clock signals to one of the data transmission circuits by each of a plurality of read clock gating circuits;
• and
• receiving the write clock signal to receive the write clock gating enabling signal accordingly and receiving the plurality of read clock signals to output the read clock gating enabling signals accordingly by a gating signal transmission circuit, wherein a depth of the gating signal transmission circuit is larger than a depth of each of the data transmission circuits at least by a predetermined number determined by a largest timing difference among the plurality of read clock signals.