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usb-avr-cpld experiment board with FTDI FT232RL, ATMEGA88 & XC9572XL
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T. Meissner 4cf56d5299 added description of the 'cpld' which contains the cpld test design 12 years ago
avr new folder 'avr' with test project to test the AVR on USB-AVR-CPLD 12 years ago
cpld new folder 'cpld' with test project to test the CPLD on USB-AVR-CPLD 12 years ago
eagle initial commit of design rules for manufacturing the pcb at q-print 12 years ago
pics update to latest schematic & board revision, now version 0.1 which is 12 years ago
README.textile added description of the 'cpld' which contains the cpld test design 12 years ago

README.textile 

h1. "usb-avr-cpld":https://github.com/tmeissner/usb-avr-cpld

p(. A small experiment board with usb-connector, usb-serial bridge, avr controller & xilinx cpld

!https://lh5.googleusercontent.com/-Al2Op9EDc1Q/UGHuXh1WkdI/AAAAAAAABss/sLXzn2gTk9k/s0-d/usb-avr-cpld.jpg!

h3. Board's main parts:

* Ftdi FD232RL USB-UART bridge
* Atmel Atmega88
* Xilinx XC9572XL CPLD

h3. Test FW:

The folder "avr":https://github.com/tmeissner/usb-avr-cpld/tree/master/avr contains a avr-gcc project with test routines for the Atmega88 controller.
It checks for the interfaces to the other devices. At the moment, a simply uart loop to the FT232RL
is implemented.

The folder "cpld":https://github.com/tmeissner/usb-avr-cpld/tree/master/cpld contains a xilinx ise / ghdl project with test design for the CPLD.
It checks for the interfaces to the other devices. At the moment, putting a simple "10101" pattern on the gpio pins is implemented.