Forum Discussion

Anthrol_T's avatar
Anthrol_T
Icon for New Contributor rankNew Contributor
1 year ago

Cyclone V General perpurse IO can't be pull down during configuration

Hi : We are using a cyclone V device 5CEFA7F31C6. We saw some general purpose IO pins(PIN_E30 and PIN_AJ7) can't be pulldown during configuration(ASx4 mode with a Serial flash device).We tho...
Configuration
Anthrol_T's avatar
Anthrol_T
Icon for New Contributor rankNew Contributor
1 year ago

we are using the following settings in the qsf file and applied them one at a time.

set_instance_assignment -name RESERVE_PIN AS_OUTPUT_DRIVING_GROUND -to p6_6v_reset

set_global_assignment -name RESERVE_ALL_UNUSED_PINS_WEAK_PULLUP "AS INPUT TRI-STATED"

set_global_assignment -name RESERVE_ALL_UNUSED_PINS_WEAK_PULLUP "AS OUTPUT DRIVING GROUND"

quartus version: Version 22.1std.1 Build 917 02/

  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    1 year ago
    Hi,
    discussed settings don't affect pin state during configuration, they are only effective in user mode. To override Hi state during configuration caused by weak pull-up connect an external pull-down resistor.