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> If you need 5V compatibility... The devil in the details is that when 5V-tolerant I/O are naively configured as such, device reliability drops like a rock. Y
by metaphor 6y ago
> If you need 5V compatibility...
The devil in the details is that when 5V-tolerant I/O are naively configured as such, device reliability drops like a rock. You'll likely find this disclosed in the manual fine print. Something to consider when prototyping a design destined for production.
- tyingq 6y agoIn these boards it's not "5V tolerant". It's actual 5V I/O. EPF10K70. They are obsolete, and so the production part doesn't apply. Solely for hobby stuff.
- metaphor 6y agoFair enough. What's the software requirement side look like? Intel's website[1; under Legacy Devices] says Quartus II v9.0 was the latest release that could target FLEX 10K devices. Doesn't look like you can download that release anymore, and liable to run into compatibility issues just installing on modern OSs without a VM. [1] https://fpgasoftware.intel.com/devices/ https://fpgasoftware.intel.com/devices/
- duskwuff 6y agoThis only became an issue a few months ago, and it's really annoying if you need older software. Intel/Altera's site used to let you download older releases; it now redirects to a discontinuation notice.
- metaphor 6y ago> ...and it's really annoying if you need older software. Bummer, and a real shame given how seemingly common regressions are in this space. Not my specialization, but anecdotally over a decade or so, I've encountered scenarios on MAX 7000 and Cyclone II (Quartus II v9.0 builds, v10.x breaks), Virtex-7 (Vivado v2018.3 builds, v2019.1 breaks) and Virtex-5 (ISE v14.6 builds, v14.7 breaks).
- baybal2 6y agoWhat do people need 5V for these days?
- tyingq 6y agoI have a lot of old 8 bit computers, and there's many interesting things you can do with a native 5v FPGA or CPLD there. I assume interfacing simply with cheap ATMEL and PIC MCUs is another use case. The university boards can also support 3.3v.
- BenjiWiebe 6y agoA lot of cheap Atmel micros can run at 3.3v and I think at least some go down to 2.7v.
- justinclift 6y agoExternal stepper motor drivers. eg: http://leadshine.com/ProductSubType.aspx?type=products&category=stepper-products&producttype=stepper-drives&subtype=general-stepper-drives http://leadshine.com/ProductSubType.aspx?type=products&categ...
- baybal2 6y agoDriving a stepper directly from FPGA? Why?
- justinclift 6y agoSeemed to be more a question of "why 5v at all?", rather than meaning FPGA-specific. ;)