track width of external/internal layer

[Nick]

Dear BeagleBoard

I have a Beaglebone black hardware and have few question regarding the same in some document i found the layer stack up dimension in mils it is mistyped as inched anyway. 

1. does this track width (50ohm single ended impedance control) marked in red represent all signal lines like spi,i2c,uart, gpio including power lines in which case the track width of power line is also 4.75 mils on external layer and 5.25 miles on internal layers ? 

Regards

Nick

[John Syne]

Unless you are using the same PCB material and manufacturer, you should ask your PCB manufacturer. Even the PCB manufacturing process can bring about impedance changes. That is why the PCB manufacturer includes a impedance token to test the impedance and then adjust their plating/edging time.   

Regards,

John

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[Nick]

thanks John

let say i am using the same PCB material then is the bellow statement true 

50ohm single ended impedance control marked in red represent all signal lines like spi,i2c,uart, gpio including power lines in which case the track width of power line is also 4.75 mils on external layer and 5.25 miles on internal layers ?

Regards

Nick