Category Archives: Programmable Logic

An analogue joystick and implementing an SPI controller

It’s been a while since my last post. The main reason being a house move. On the plus side this is good for my projects as I now have lots more room to work on them. On the negative side, at least as far as my hobbies are concerned I’ve, somewhat unexpectedly, found myself doing some work for my old company…. Read more »

More progress…. Lots of different areas

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Looking again at the VHDL for my interrupt router, I realised that adding a priority encoder was fairly simple: Instead of being the masked and active interrupt lines, ROUTED is now the number (bit position plus one) of the active line. 0 is used as a special case: no interrupt lines, which are exposed by the mask, are active. This… Read more »

Sound, video, DMA; more bring up

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Construction of the MAXI09 is continuing. With each part soldered onto the board comes a limited amount of testing with the monitor. Enough to exercise the very basic level of functionality, nothing more. Proper testing, and actually making the part do cool things, will come later. The first part added was the OPL2: Since this was previously prototyped on breadboard… Read more »

MuDdy and DISCo progress, and system reset generation

I have finally solved the issue with holding multiple FPGA designs inside a single configuration flash. It seems there is a special tool just for the purpose of creating complex program files (.pof files). The details are buried in this document. So this is great news, though since I only have one PLCC84 adapter made up I won’t be able… Read more »

Breadboard power solution and the start of FPGA dev board version 2

When working with solderless breadboard, one of the concerns is how to power it. Ideally I would have a nice bench PSU but, being cheap, I makedo without one. In the past I have stumbled around with various solutions, including using the power pins on a USB serial breakout board, using an AVR programmer header just for the purpose of… Read more »