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--- pad_frame [2020/12/12 04:48]
vsaxena created
+++ pad_frame [2020/12/12 04:57] (current)
vsaxena
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 The pad frame appears as below:
 {{:wiki:padframe1.png?400|}}
-These basic pads designs are without ESD diodes. There are several cells in a I/O pad library. Here, we have PadNC (no connect), PadVdd (supply pad), PadGnd (ground pad), and PadAnalog (Pad for analog signals) as shown below. The PadFC is the frame corner cell.
+These basic pads designs are without ESD diodes. There are several cells in a I/O pad library. Here, we have PadNC (no connect), PadVdd (supply pad), PadGnd (ground pad), and PadAnalog (Pad for analog signals) as shown below. The PadFC is the frame corner cell. A designer can create custom padframe as needed for their designs using these cells. Commercial I/O pad cells include complex ESD, I/O circuits and guard rings.
 {{:wiki:pads.png?400|}}
 You will notice two pad rings. The out ring is connect to the supply (vdd!) and the inner ring is connected to (gnd!). These rings provide low resistance access to the supply rails for making connection. In a commercial I/O Pad ring, you will see separate digital and analog rings as shown below:
+{{:wiki:padframe2.png?300|}}
+You design goes in the empty area in the middle. Connect vdd! and gnd! to the I/O rings and the input and output signals to the PadAnalog pins.

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