Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Function of MSEL pins in FPGA

Dear sir, I would like to know, the function of MSEL[2:0] pins on Cyclone-IV. What will they decide ? Will they decide the mode in which the FPGA is getting configured ? Or the ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Dear Carlhermann,

"Thus you either should connect all to GND (being the coding for passive serial) or the combination you intend to use on the board but not to a combination of MSEL and "false" configuration voltage (e.g. 3.3V and 010 for active serial standard for 3V and 2.5V) "

I have not understood the example you given. Does this mean the following....?

Don't connect MSEL pins to '010', if the configuration voltage standard is 3V & 2.5V.

Connect MSEL to 011 if the configuration voltage standard is 3V & 2.5V. Please confirm.

If the above understanding is correct please confirm the following.

I am referring Table 8–5. Configuration Schemes for Cyclone IV E Devices of Cyclone-IV handbook.

The note below the table is copied below.

1) Configuration voltage standard applied to the VCCIO supply of the bank in which the configuration pins reside.

In cyclone-IV E device, all configuration pins(Active serial configuration pins) are in bank 1. I want to configure FPGA in AS mode. I will power bank 1 at 3.3V only.

Will it be alright if I set to MSEL=010 ? Or do I need to consider other configuration pins listed in Table 8–18. Configuration Pin Summary for Cyclone IV E Devices, and their bank voltages to select MSEL values ?

Please help.

Regards,

Thulasi