Apparatus for detecting data transmission rate and method therefor

An apparatus for detecting a data transmission rate through a serial bus after a bandwidth for the serial bus is allocated to a system, the apparatus comprising:

• a data transmission rate detecting unit for detecting a data transmission rate of bit stream data transmitted through a predetermined transmission line;
• a sampler for sampling a data transmission rate detected by the data transmission rate detecting unit at a predetermined period;
• a low-pass filter for low-pass filtering a value sampled by the sampler;
• an error detecting unit for detecting an error value in the data transmission rate of the transmitted bit stream data using the value sampled by the sampler and a low-pass filtered value;
• a first comparing unit for comparing the error value detected by the error detecting unit with a reference error level;
• an estimated data transmission rate output unit for outputting an estimated data transmission rate based on the low-pass filtered value when the error value is smaller than the reference error level;
• and
• a second comparing unit for comparing the estimated data transmission rate with an upper bound and a lower bound to notify whether the estimated data transmission rate output from the estimated data transmission rate output unit exists between the upper bound and the lower bound set by a user according to the allocated bandwidth and to determine whether the estimated data transmission rate is output.

A method for detecting a data transmission rate through a serial bus, the method comprising the steps of:

• (a) detecting a data transmission rate of bit stream data transmitted through a predetermined transmission line;
• (b) detecting an error in the data transmission rate at a first predetermined period using the detected data transmission rate;
• (c) comparing the error with a reference error level;
• (d) checking present operation mode when the error is smaller than the reference error level;
• (e) outputting an estimated data transmission rate for the first predetermined period using the data transmission rate when the present operation mode is a transmit/receive average mode;
• and
• (f) outputting the estimated data transmission rate for the first predetermined period in a case where the estimated data transmission rate for the first predetermined period does not exist between a predetermined upper bound and a predetermined lower bound when the present operation mode is a transmit/receive tracking mode.