Data transmitting device, data receiving device, data transmitting system, and data transmitting method

A data receiving device receiving a request signal and a data signal from a transmitter through a delay insensitive data transmitting method, the data receiving device comprising:

• a decoder configured to receive an input current signal having three logic states, generate a voltage value corresponding to the three logic states using a reference current, and restore the request signal and the data signal using the generated voltage value;
• and
• a data receiver configured to transmit a reply signal to the transmitter in response to the restored request signal and the restored data signal,
• wherein the decoder comprises:
• a current to voltage converter configured to differentiate a current level of the reference current and a current level of the received input current signal, and output first and second logic voltages corresponding to the differentiated current level;
• a request signal restorer configured to generate a periodic temp request signal using the first and second logic voltages, delay the temp request signal, and restore the request signal in which a logic level is changed at each rising point of the delayed temp request signal;
• and
• a data signal restorer configured to perform a first operation on the first and second logic voltages to generate a temp data signal, perform a second operation on the first and second logic voltages and the temp request signal to generate a temp clock signal, and sample the temp data signal using the temp clock signal to restore the data signal.

A data transmitting system including a plurality of locally synchronous modules that perform mutual data communications through a delay insensitive data transmitting method, the data transmitting system comprising:

• a data transmitter configured to generate a request signal and a data signal, the data signal having a Non-Return-to-Zero (NRZ) format that is divided into a binary value 0 and a binary value 1 at a transition point of the request signal;
• an encoder configured to receive the request signal and the data signal and output an output current signal having three different current levels based on the request signal and the data signal;
• a decoder configured to detect a current level of the output current signal, generate a voltage value corresponding to the detected current level, and restore the request signal and the data signal according to the generated voltage value;
• and
• a data receiver configured to generate a reply signal in response to the restored request signal and the restored data signal to transmit the reply signal to the data transmitter,
• wherein the encoder comprises:
• a data comparator configured to generate a delay data signal by delaying the data signal by a predetermined delay time, sample the data signal and the delay data signal using the request signal, and output the sampled data signal and an operation signal that is obtained by comparing the sampled data signal and the sampled delay data signal;
• and
• a voltage to current converter configured to output the output current signal having different current levels according to a logical combination of the sampled data signal and the operation signal.

A data transmitting method transmitting data through a delay insensitive data transmitting method, the method comprising:

• receiving a request signal and a data signal, the data signal having a Non-Return-to-Zero (NRZ) format that is divided into a binary value 0 and a binary value 1 at a transition point of the request signal;
• delaying the data signal by a predetermined delay time to output a delay data signal;
• sampling the data signal and the delay data signal using the request signal;
• comparing the sampled data signal and the sampled delay data signal, outputting an operation signal based on the comparison result, and outputting an output current signal having one of three different current levels according to a logical combination of the sampled data signal and the operation signal;
• receiving the output current signal having one of the three different current levels;
• detecting the received current level and generating first and second logic voltages according to the detected current level;
• and
• restoring the data signal and the request signal based on the first and second logic voltages.