654 USB CDC (Serial) Device

654 : USB CDC (Serial) Device

Design render

How it works

A USB CDC to UART bridge, based on tinyfpga_bx_usbserial.

How to test

  1. Connect usb_p and usb_n pins to D+ / D- USB pins either through 68 ohm resistors or directly (the resistors are recommended, but not mandatory).
  2. Connect a 1.5k ohm resistor between dp_pu_o and usb_p (D+).
  3. Connect the RX and TX pins to a UART device or to a logic analyzer.
  4. Set the clock frequency to 48 MHz.

The device should appear as a serial port on your computer, with vendor_id=1209 and product_id=5454 (https://pid.codes/1209/5454/). The baud rate for the UART interface is hardcoded at 115200.

Demo mode

Set ui_in[0] high to enable demo mode. In this mode, the device sends "Tiny Tapeout!" over USB once per second. UART RX input is ignored while demo mode is active.

External Hardware

USB breakout board, 1.5k ohm resistor

IO

#InputOutputBidirectional
0demo_modeusb_p
1usb_n
2dp_pu_o
3RX
4TX
5
6
7configured

Chip location

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