[quote user="Takayuki Miyazaki"]...there were reflected signals which TM4C1290 drives on SCL-line during Read-access .[/quote] Were those same 'reflected signals' present when, 'Writing to the Slave - as well?' (that's highly suspected) Along w/vendor's (transmission line) direction - the SCL's pcb trace should be as short & direct as possible - perhaps widened as well...
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