“Bus Expert” is a PC-based instrument specialized in eMMC/SD protocol measuring and analyzing. Its 1.6GHz timing sampling frequency could meet the requirement of signal measuring of eMMC4.5/5.0 or above. Specially designed front probe could help engineers capture tiny changes of circuit for HS200 mode signal, which having high frequency and low voltage. 48-level trigger and packet (including cmd, addr, arg, data, status, etc.) trigger are helpful for finding problematic signals quickly and accurately. Automatic tests of card identification and data transfer are the major headachy problems of eMMC designing. Its matched software completely meets JEDEC program specifications, engineers could get a good solution from it. (Our company is a member of JEDEC and has attended many conferences of its specification commission.) In the past, PC-based instrument always be thought to having sampling shifting of high frequency signal and low clock accuracy, but this product has added fine tuned front circuit probe for each channel and developed emulated calibration of 78ps high resolution, and that would solve the problem of timing shifting and greatly reduce the possibility of signal be decoded wrongly. It is surely an advanced product in the PC-based area. eMMC specification has developed to version 4.51 and 5.0, outpacing the researching and developing of many opponents, but we have joined the JEDEC and keep updating Bus Expert. Now Bus Expert supports eMMC5.0 specification, standing firmly at the peak in the market.