How to perform custom pin-placement during Floorplanning? about openlane

[ax3ghazy]

Hi @njose939,

This is currently not very possible. The only options you have for pin placement currently are random equidistant distribution of pins, or a placement that optimizes the HPWL (see the FP_IO_MODE configuration parameter). What you describe is a feature we wanted to implement for a while, so I will leave this open until it's available.

Thanks.

[agorararmard]

@nickson-jose: You can set set ::env(FP_PIN_ORDER_CFG) $::env(DESIGN_DIR)/pin_order.cfgand add a pin_order.cfg under your design directory like this one: https://github.com/efabless/openlane/blob/master/designs/spm/pin_order.cfg

[Haseeb-Baloch]

The example pin_order.cfg sets all 32 pins of the 'x' input to the north, is there anyway to divide these pins to 2 sides?

[agorararmard]

@Haseeb-Baloch: this will serve as a better example for you: https://github.com/efabless/caravel/blob/master/openlane/user_project_wrapper/pin_order.cfg

[Haseeb-Baloch]

Thank you @agorararmard this was exactly what I was looking for

[hanm2019]

Hi, I have a question about pin_order.cfg file. It seem that It can custom the pins in which sides.

If the pin_order.cfg is :

#N
x
y
z

Does it means that there are three pin in the north and the relative position of the three pins is decided, such as x y z? or the z x y is also possible?