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CC2500: the unknow voltage drop of SO(GD01) signal

Part Number: CC2500

Hi Dear, 

my customer met a abnormal voltage drop phenomenon on the SO(GD01) signal. The waveform is as below. Green line in red marker. 

what's the status of the CC2500 chip during this "drop" will it impact the normal functionality? 

PS. yellow: Power, 3.3V. orange: SO signal after level shifter. 

Zoom In

BR. Albin