CycloneV :MSEL(4:0) and VCCPGM voltage

Question

Good morning ,I'm working with CycloneV GX at AS (x1 and x4) Standard configuration.I've read at CycloneV Handbook ,that MSEL(4:0) pins shall be connected to VCCPGM or GND directly.  The Voltage value of VCCGM is 3.0/3.3V.But at the scheme of Cyclone V SoC FPGA Development Kit Board, you can see MSEL(4:0) connected to VCCPGM=2.5V via resistors and switch. Is it correct to connect MSEL pins to 2.5V?N.B. I've attached print-screen  from the scheme.

jonway_altera · Answer

Hi @HBhat2-GRL​ You are correct. VCCPGM for 2.5V and below is not supported for AS mode. I stand corrected for my previous answer.I found a kdb that explains it:https://www.intel.com/content/altera-www/global/en_us/index/support/support-resources/knowledge-base/solutions/rd04262013_77.htmlHope this clears all the doubts.

hbhat2 · Answer

As per all the Intel recommendation documents, VCCPGM must be 3V/3.3V for AS x1, ASx4 configuration.

I am not sure why it is 2.5V in Cyclone V SoC kit. But, in Cyclone V GX Dev kit, VCCPGM is 2.5V, but no support for ASx1 and ASx4 mode.

Regards,

HPB

jonway_altera · Answer

Hi @AGofs​ If you refer to https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/dp/cyclone-v/pcg-01014.pdfIt states that: Connect these pins to either a 1.8V, 2.5V, 3.0V, or 3.3V power supplyThus, it is ok for VCCPGM to connect to 2.5V.

hbhat2 · Answer

Hi @JwChin​ ,The above document mentions the possible values for VCCPGM, but it does not talk about in conjunction with ASx1, ASx4 configuration mode.https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/cyclone-v/cv_5v2.pdf, page 244, Table 7-2:  says that either 3.3V or 3.0V must be connected if Cyclone V platform supports ASx1, ASx4 mode of configuration.This table in the handbook  is the real cause for the confusion.With Regards,HPB

hbhat2 · Answer

Hi @JwChin​ ,Thank you for sharing the kdb. This clears my confusion and it helps me to conclude that for Cyclone V devices, VCCPGM must be connected to either 3.3V or 3.0V for ASx1, ASx4 mode.WithRegards,HPB

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CycloneV :MSEL(4:0) and VCCPGM voltage

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