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No change in size ,  23:13, 7 June 2020
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On the phat units, the [[UDC|multiconnector]] port has UART exposed on pin 6 and 7. Additionally there are pins 11, 12, and 13 that are routed directly to Ernie (seen through PCB delayering).
 
On the phat units, the [[UDC|multiconnector]] port has UART exposed on pin 6 and 7. Additionally there are pins 11, 12, and 13 that are routed directly to Ernie (seen through PCB delayering).
   −
[[File:Multiconnector testpoints.png|thumb|Yellow = UDC pin 12, Cyan = UDC pin 11, Green = USC pin 6 (RX), Magenta = UDC pin 7 (TX)]]
+
[[File:Multiconnector testpoints.png|thumb|Yellow = UDC pin 12, Cyan = UDC pin 11, Green = UDC pin 6 (RX), Magenta = UDC pin 7 (TX)]]
    
We observe that without anything attached, the resistance between pin 11 and 12 is exactly 200Kohm. When the DevKit USB ethernet adapter is plugged in, the resistance between pin 11 and 12 is non-linear. One theory is that there is some sort of accessory sense based on these pins and the [[Ernie_Firmware#Voltage_Table]].
 
We observe that without anything attached, the resistance between pin 11 and 12 is exactly 200Kohm. When the DevKit USB ethernet adapter is plugged in, the resistance between pin 11 and 12 is non-linear. One theory is that there is some sort of accessory sense based on these pins and the [[Ernie_Firmware#Voltage_Table]].

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