HSTX Port

At the bottom edge of the board is the 22-pin HSTX port. It accepts an FPC ribbon cable to connect to the HSTX FPC output on the Adafruit Feather RP2350 with HSTX. This port is for accessing the 8 consecutive HSTX peripheral pins (GPIO12-19), a few additional GPIO, 3.3V power and GND. The following RP2350 pins are connected to the 22-pin port:

• 3.3V - output from the 3.3V regulator.
• GND - common ground for power and logic.
• SCL/GPIO3 - The main I2C1 clock pin.
• SDA/GPIO2 - The main I2C1 data pin.
• D11/GPIO11 - Digital I/O pin 11.
• D10/GPIO10 - Digital I/O pin 10.
• D0N/GPIO19 - Digital I/O pin 19 and one of the 8 HSTX peripheral pins.
• D0P/GPIO18 - Digital I/O pin 18 and one of the 8 HSTX peripheral pins.
• D1N/GPIO17 - Digital I/O pin 17 and one of the 8 HSTX peripheral pins.
• D1P/GPIO16 - Digital I/O pin 16 and one of the 8 HSTX peripheral pins.
• CKN/GPIO15 - Digital I/O pin 15 and one of the 8 HSTX peripheral pins.
• CKP/GPIO14 - Digital I/O pin 14 and one of the 8 HSTX peripheral pins.
• D2N/GPIO13 - Digital I/O pin 13 and one of the 8 HSTX peripheral pins.
• D2P/GPIO12 - Digital I/O pin 12 and one of the 8 HSTX peripheral pins.

DVI Port

At the top edge of the board is the DVI output port. The following pins from the HSTX port are connected to the DVI port:

• CKP - TMDS clock signal pin. Connected to GPIO14.
• CKN - TMDS clock signal pin. Connected to GPIO15.
• D0P - TMDS channel 0 signal pin. Connected to GPIO18.
• D0N - TMDS channel 0 signal pin. Connected to GPIO19.
• D1P - TMDS channel 1 signal pin. Connected to GPIO16.
• D1N - TMDS channel 1 signal pin. Connected to GPIO17.
• D2P - TMDS channel 2 signal pin. Connected to GPIO12.
• D2N - TMDS channel 2 signal pin. Connected to GPIO13.
• Hot plug detect - Hot plug detection is used to detect if a device is connected or disconnected to the HDMI connector by monitoring power, plug and unplug events. Connected to GPIO11.
• CEC - Consumer Electronic Control is a one-wire bidirectional serial bus that is standardized for remote control functions. Connected to GPIO10.

DVI Port Jumpers

• CEC - on the back of the board, directly below the DVI Out silk label, is the CEC jumper. It is outlined in white on the silk and is labeled CEC. If you cut the jumper, it will disconnect the CEC signal from GPIO10.
• HPD - on the back of the board, along the bottom edge, is the hot plug detect jumper. It is outlined in white on the silk and is labeled HPD. If you cut the jumper, it will disconnect the hot plug detect signal from GPIO11.