I'm just starting out on a Coolrunner II project which will require an I2C interface to an LCD matrix. I found the Verilog source in XAPP385 for a uC interface to just such a controller, and I'm now trying to simulate the module to ensure that I understand how it works.
When I instantiate and run the attached simulation, I see the DTACK line go low from the uC interface after I initiate a write transfer. I then release the bus and deassert the address and data strobe, but there is no activity on the SCL/SDA lines indicating that a transfer is occurring. So what bozo mistake am I making in my understanding of how this should work?
