I continued checking these broken boards recent days. I found for the TX side, the graph stops as soon as it starts. It seems the daughter board gives some signal to stop the motherboard to load data from PC. I read the .sch file in the subversion repository and the defination of the interface between db and mb.
IOUTN_B IOUTP_B IOUTP_A IOUTN_A ---- the analog IF signal mb-->db clock ---- the db is synchronous with mb mb-->db I2C_A0 I2C_A1 ---- TX/RX RX1/RX switch control signal mb-->db SCLK SDA ---- R/W interface to E2PROM mb<-->db IO0~IO15 ---- for debug usage. mb<-->db Which pin will give a wrong signal to motherboard and disable the board? IO? We never used u_write_oe. So it may be as a input? Thanks for Eric and Nikhil's help before. Hope you are continously interested in my bug investigation. Thank you. :) HUANG Lin
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