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Altera_Forum's avatar
Altera_Forum
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17 years ago

Universal PCB

Hi!

I'm going to do an universal PCB which is going to work with EP3C10, EPC16 and EP3C25 devices in E144 package. I have a question about first pins. In EP3C10 pins 1, 2 and 3 are IO while in EP3C16 and EP3C25 they are VCCD_PLL3, GNDA3 and VCCA3.

How should I connect those pins and how I should set "Reserve all unused pins" property in "Device and pins options"?

thanks for your help

Mateusz

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    The said pins must be connected to the respective supply voltages.

    I would expect, that Quartus said the migration pins to input independent of unused pin settings. But input with weak pullup or input with hold (Cyclone III default) is the best setting anyway to my opinion. It's best compatible also with ground or supply connected pins.
  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    Did you list the three devices in the "Migration Devices" dialog box reached from the "Device" page of the "Settings" dialog box? When you tell Quartus to take care of the pin-by-pin differences between devices, the .pin and .fit.rpt files will tell you how to connect the pins in a way compatible with all devices you have selected for migration.

    For pins 1, 2, and 3 being asked about here, Quartus tells you to connect them as FvM said: "The said pins must be connected to the respective supply voltages." From the .pin file in my test case: 

    Quartus II Version 8.0 Build 215 05/29/2008 SJ Full Version
CHIP  "generic_test_case"  ASSIGNED TO AN: EP3C10E144C7
Device Migration List: "EP3C16E144C7, EP3C25E144C7"
Pin Name/Usage               : Location  : Dir.   : I/O Standard      : Voltage : I/O Bank  : User Assignment
-------------------------------------------------------------------------------------------------------------
VCCD_PLL3                    : 1         : power  :                   : 1.2V    :           :                
GNDA                         : 2         : gnd    :                   :         :           :                
VCCA3                        : 3         : power  :                   : 2.5V    : 1         :