ECM1900
LEDs
User LEDs
There are eight general-purpose LEDs on the ECM1900. Each is wired to the FPGA (bank 66) as shown in the table below.
| LED REFerence DESignator | FPGA PIN |
|---|---|
| D3 | AF10 |
| D4 | AC14 |
| D5 | AG9 |
| D6 | AF8 |
| D7 | AH8 |
| D8 | AG8 |
| D9 | AH11 |
| D10 | AG11 |
LED Operation in HDL
The LED anodes are connected to a pull-up resistor to +3.3 V, and the cathodes wired through NMOS transistors to the FPGA I/O on Bank 66.
To operate the LEDs from FPGA gateware (HDL):
- To turn ON an LED, the corresponding FPGA pin should be at logic
1. - To turn OFF an LED, the corresponding FPGA pin should be at logic
0.
Status LEDs
The ECM1900 has some LEDs to indicate system status. These are described in the table below.
| LED REFerence DESignator | Description |
|---|---|
| D11 | PS_DONE indicator. Driven by a mosfet from the PS_DONE signal and lite as an inverse of the signal level. The LED is on when PS_DONE is LOW. |
| D13 | VBUS FAULT – Indicates an out of bound condition for the power on the PS-USB2 port. |
| D1 (labeled RX) | USB UART console connection RX activity light |
| D2 (labeled TX) | USB UART console connection TX activity light |