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Altera_Forum
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8 years ago

Cyclone V Configuration Devices

I've got a Terasic Cyclone V GX development board. I removed the EPCQ256 configuration device and am testing two other alternatives (Macronix MX25L257 and Cypress S25FL128). I created a simple proj...
Altera_Forum's avatar
Altera_Forum
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8 years ago

ilkkak,

I really appreciate you confirming that. We're going to have to modify our board a bit.

As near as I can tell, absolutely everyone (me, you, our FAE and the rest of planet earth) is confused about the Altera programming :-). I think we're all confusing two issues: 1) configuring the FPGA during boot (ie FPGA reads FLASH) and 2) programming the FLASH itself. The ASx1 vs ASx4 settings seem to refer to the former and have nothing to do with the latter. I'm pretty sure the ASx1 mode for an EPCQ device would only be useful to someone that programmed it prior to putting it on the board. To actually program the FLASH itself, we should follow Figure 7-13 "Connection Setup for Programming the EPCQ Using the JTAG Interface" which is sounds like you did.

If my understanding is correct, you should be able to use ASx4 configuration and boot a bit faster.

I'll be able to confirm after we modify our board. Thank you Altera for making something that should be routine into a nightmare.