BREADBOARD VS ALTERA QUARTUS II SERIES

ThatвЂ™s easy for me to say as I usually have severalВ lying around, but if you donвЂ™t have one itвЂ™s not too painful to get into the game. To program a standalone CPLD like this, a dedicated programmer is needed. If all of the resistors were pull-ups I would use a resistor network but alas, one is to ground.

The 10 pin connector and a handful of resistors comprise the programming circuit. By using a pull-up you have a point where you can connect a signal and use the gate without having to cut copper traces. This is especially true in my experience for unused gates, which as you probably know should never be left floating or unconnected. Lastly with a pin tied to a power rail through a resister, whether power or ground, oneВ can change theirВ mind later and use the pin. Over the years I have seen problems in production (mass quantities)В where occasionally something like power cycling will allow a pin tied directly to a power rail to have a higher voltage than the chip itself which is bad.

BREADBOARD VS ALTERA QUARTUS II SERIES

I prefer to use a series resistor that would limit current during transients, even if it is not supposed to be needed. The kind of reasons that flit through my mind when dealing with this sort of function include the factВ that I donвЂ™t like to tie an input pin directly to a power railВ if I can help it. If you watch the video you will see me discuss my personal preference for how I treat the enable вЂњINHвЂќ pin on an oscillator simply put I tend to leave it floating after I check with the spec sheet thatВ doing soВ is legal. If an external clock is available, the higher speed clock on the module can be used to create a clock event on each rising or falling edge of the external clock and still abide by the guidelines for CPLD/FPGAвЂ™s that says that you really should use the internal global clock network and not drive a clock input вЂњasynchronouslyвЂќ.В This oscillator is rated for a supply voltage between 1.8 and 5.5 volts. The on-board oscillator is included so that the CPLD can do things statefully and create fast counters on its own without the need for an external clock. This package can be inserted in a through-hole socket or directly soldered to the PCB. This part known as the EPM7032 and EPM7064, comes in a 44 pin Plastic Leaded Chip Carrier (PLCC) or sometimes called J Lead due to the J shape of the pin leads. The CPLD: A surface mount part that fits a through-hole socket Looking at the schematic you can tellВ there isnвЂ™t much to it: basically the CPLD, the circuit for In Circuit Programming and an oscillator to drive the logic in the CPLD. A macrocell is the basic logic building block and it is programmed with logic вЂњtermsвЂќ and then interconnected to other macrocells through a programmable interconnect. The logic itself is a CPLD IC from the Altera Max family with two versions that fit the board with either 32 or 64 macrocells. To implement an easily solderable kit I went with an older CPLD part that also has 3.3v and 5v versions that will maintain itsВ programming regardless of power. Duh.Д«ut let me back up and show more aboutВ what IвЂ™m doing, I wanted to make a programmable piece of logic that could be built as a kit oneВ could easily solder at home, could be programmed in-circuit, and could work at 3.3 or 5 volts. It seems that the plugin space available on a solderless breadboard is 1.1вЂќ, I had made the footprint 1вЂќ wide leaving no room for a row of wires on both sides. I created a CPLDВ module with the intent of being able to plug it into lots of things including solderless breadboards, but I screwed up. What better way to learn than to get your hands on a CPLD and give it a try? This might be replacing an obsolete chip, or maybe just a way to learn and try different techniques. As its name implies, you can program these chips to serve the logic functions you need.

A Complex Programmable Logic Device (CPLD) is a great piece of hardware to have in your repertoire.

Breadboard vs altera quartus ii