foxglove

Foxglove

an advanced level shifting GreatFET neighbor

Required KiCad dependency:

https://github.com/greatscottgadgets/gsg-kicad-lib

If you are using git, the preferred way to install gsg-kicad-lib is to use the submodule:

git submodule init && git submodule update

Level Shifting

Foxglove is useful for interfacing with external targets at variety of I/O voltage levels using a wide variety of protocols including SPI, I2C, UART, and JTAG. Level shifting on bank A is performed by the NXP 74LVCH1T45GW,125 supporting external voltages from 1.2 V to 5 V. Level shifting on bank B pins is performed by the Lattice LFE5U-12F-6BG256C (ECP5) FPGA supporting external voltages from 1.2 V to 3.3 V. Bank B also supports differential signals such as LVDS.

Pin Multiplexing

The FPGA allows Foxglove to switch arbitrary external wires to a variety of pins on the Azalea's microcontroller in order to support a wide range of microcontroller peripherals.

Measurement and Probing

Foxglove provides the ability to connect an ADC, DAC, comparator, pull-up resistor, or pull-down resistor to any of the pins on bank A. This allows analog measurement and probing of external targets.

Additionally, Foxglove is very useful for digital logic analysis and pattern generation.