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[ADV7181D] Why is there no round mark (circle) which shows VIA on the layer 1 of the evaluation board?

Question asked by Tamu on May 21, 2014
Latest reply on May 22, 2014 by Tamu

Hello.

 

I have a question about layout of evaluation board of ADV7181D.
Please refer attached file "ADV7181D_Evaluation_Board_Rev0_Layout.pdf"
My customer is going to draw layout of their board.
So they refer the evaluation board layout.

 

Question:
About the layout of Exposed Pad, we think it is connected to GND with Four-layer Through-Hole VIA of your evaluation board.
But on the layer 1 (page 2 of "ADV7181D_Evaluation_Board_Rev0_Layout.pdf"), we can not see round mark (circle) which shows VIA.
(We can see round mark (circle) which shows VIA on layer 2, 3 and 4 at Exposed Pad.)
Why is there no round mark (circle) which shows VIA on the layer 1?

 

Thank you!
Best regards.

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