BIST for 2.5-Gb/s SerDes based on dynamic detection

This paper describes a design of BIST system for single channel 2.5-Gb/s serializer/deserializer (SerDes) macros, including PRBS generator and checker. In order to fit the word width of DUT, a 10-bit parallel PRBS data generator is made. And for PRBS checker, a new method, called dynamic detecting is used to obtain the head symbol dynamically. After that, an referenced PRBS generated, and compared with signals received by PRBS checker. Finally, BER will be calculated to make sure if it is satisfied with the target.