TRX Duo SDR GPIOs and Connectors Guide
There are 5 groups of GPIOs on TRX DUO SDR for external connections, ADC configuration and debugging. Two RF IN ports reserved for bypassing the input filters on RX1 and RX2. Click to see the product here.
Port A
| Pin | Description | FPGA pin number | FPGA pin description | Logic levels |
| 1 | 3V3 | |||
| 2 | 3V3 | |||
| 3 | DIO0_P | G17 | IO_L16P_T2_35 (EXT TRIG) | 3.3V |
| 4 | DIO0_N | G18 | IO_L16N_T2_35 | 3.3V |
| 5 | DIO1_P | H16 | IO_L13P_T2_MRCC_35 | 3.3V |
| 6 | DIO1_N | H17 | IO_L13N_T2_MRCC_35 | 3.3V |
| 7 | DIO2_P | J18 | IO_L14P_T2_AD4P_SRCC_35 | 3.3V |
| 8 | DIO2_N | H18 | IO_L14N_T2_AD4N_SRCC_35 | 3.3V |
| 9 | DIO3_P | K17 | IO_L12P_T1_MRCC_35 | 3.3V |
| 10 | DIO3_N | K18 | IO_L12N_T1_MRCC_35 | 3.3V |
| 11 | DIO4_P | L14 | IO_L22P_T3_AD7P_35 | 3.3V |
| 12 | DIO4_N | L15 | IO_L22N_T3_AD7N_35 | 3.3V |
| 13 | DIO5_P | L16 | IO_L11P_T1_SRCC_35 | 3.3V |
| 14 | DIO5_N | L17 | IO_L11N_T1_SRCC_35 | 3.3V |
| 15 | DIO6_P | K16 | IO_L24P_T3_AD15P_35 | 3.3V |
| 16 | DIO6_N | J16 | IO_L24N_T3_AD15N_35 | 3.3V |
| 17 | DIO7_P | M14 | IO_L23P_T3_35 | 3.3V |
| 18 | DIO7_N | M15 | IO_L23N_T3_35 | 3.3V |
| 19 | GND | |||
| 20 | GND |
Port B
| Pin | Description | FPGA pin number | FPGA pin description | Logic level |
| 1 | 5V | |||
| 2 | 5V | |||
| 3 | SPI(MOSI) | E9 | PS_MIO10_500 | 3.3V |
| 4 | SPI(MISO) | C6 | PS_MIO11_500 | 3.3V |
| 5 | SPI(SCK) | D9 | PS_MIO12_500 | 3.3V |
| 6 | SPI(CS#) | E8 | PS_MIO13_500 | 3.3V |
| 7 | UART(TX) | C8 | PS_MIO08 | 3.3V |
| 8 | UART(RX) | C5 | PS_MIO09 | 3.3V |
| 9 | I2C(SCL) | B9 | PS_MIO50_501 | 3.3V |
| 10 | I2C(SDA) | B13 | PS_MIO51_501 | 3.3V |
| 11 | GND | GND | ||
| 12 | GND | |||
| 13 | Analog Input 0 | 0-3.3V | ||
| 14 | Analog Input 1 | 0-3.3V | ||
| 15 | Analog Input 2 | 0-3.3V | ||
| 16 | Analog Input 3 | 0-3.3V | ||
| 17 | Analog Output 0 | 0-1.8V | ||
| 18 | Analog Output 1 | 0-1.8V | ||
| 19 | Analog Output 2 | 0-1.8V | ||
| 20 | Analog Output 3 | 0-1.8V |
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Port C
| Name | Description | Note |
| DITH | short to enable Internal Dither | Internal Dither The LTC2208 is a 16-bit ADC with a very linear transfer function; however, at low input levels even slight imperfections in the transfer function will result in unwanted tones. Small errors in the transfer function are usually a result of ADC element mismatches. An optional internal dither mode can be enabled to randomize the input location on the ADC transfer curve, resulting in improved SFDR for low signal levels. |
| PGA | short to set PGA =0 | The PGA pin selects between two gain settings for the ADC front-end. PGA = 0 selects an input range of 2.25VP-P; PGA = 1 selects an input range of 1.5VP-P. The 2.25V input range has the best SNR; however, the distortion will be higher for input frequencies above 100MHz. For applications with high input frequencies, the low input range will have improved distortion; however, the SNR will be 1.8dB worse |
| EN2 | short to disable ADC2 | Can reduce 1.2W power consumption and reduce heat generation |
Port IN1 & IN2
RF IN1 and RF IN2 will bypass the input Lowpass filter on RX1 and RX2 path, this could be used for under-sampling.
Port E
| PIN Name | Description |
| 0P | IO_L2P_T0_34 |
| 0N | IO_L2N_T0_34 |
| 1P | IO_L11P_T1_SRCC_36 |
| 1N | IO_L11N_T1_SRCC_36 |
| 2P | IO_L6P_T0_34 |
| 2N | IO_L6N_T0_34 |
| 3P | IO_L13P_T2_MRCC_34 |
| 3N | IO_L13N_T2_MRCC_34 |
Port D
This is the JTAG connector, used for debugging.
