phyCORE-AM3517 Hardware Manual

Part I, Chapter 13: AM3517 IO and GPMC Bus Voltage L-761e_2

13 AM3517 IO and GPMC Bus Voltage

The buffered memory bus operating voltage is configurable at 1.8V or 3.3V via jumper J8 to allow connection to a variety of devices. By default this jumper is set to the 2+3 position, selecting 3.3V. To interface 1.8V low power devices to the external memory bus, J8 should be set to the 1+2 position.

Switching to 1.8V IO will reduce the power consumption of the embedded system.

WARNING:

Normal operating voltage for the Carrier Board and SOM is 3.3V.

In 3.3V IO mode the following is required:

• Carrier Board X21 set to 3+5 and 4+6

• Carrier Board JP13 set to OPEN

• SOM J8 set to 2+3

• SOM U3 SN65LVDS93 optionally installed

• SOM J23 set to 1+2

In 1.8V IO mode the following is required:

• Carrier Board X21 set to 1+3 and 2+4

• Carrier Board JP13 set to CLOSED

• SOM J8 set to 1+2

• SOM U3 SN75LVDS83B optionally installed

• SOM J23 set to 2+3

Failure to follow these guidelines will result in damage to the SOM and Carrier Board circuitry.

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