Hello, all. I have a problem on using Openlane to synthesize and make gds from verilog code of combinational logic As shown below, I configured .json file and ran openlane, but error happend. How can I solve it?

@Junbeom Park It maybe that the default synthesized size is too small. If you don’t want to set an explicit size, maybe a lower utilization will work. (default is 50)

"FP_CORE_UTIL": 10,

@Mitch Bailey Thank you! it works! After generating, I viewd layout as below. but it seems to be large due to distance between pins(left and right) I modifed some variables in config.json but effectless. Can you tell me an advice?

@Junbeom Park using

FP_PIN_ORDER_CFG

causes the pins to be distributed evenly along a side. There are a few things you can do to skip slots, but you’ll have to look through the documentation/code. Another way to handle pins is to define them in a def file. This is what

user_project_wrapper

does so that the pins are always in the expected location. As far as your example above, I think the

DIE_AREA

solved the original problem, not the

FP_CORE_UTIL

like I suggested.

@Mitch Bailey Thank you. I will try!

I think the FP_PDN variables only affect the power nets. To change the input/output pin locations, look into the pin_order.cfg options.

Thank you. I resized core and die area c by configuring variables.

@Junbeom Park Looks like the pins are distributed evenly over each side. From the configuration variable explanation

Points to the pin order configuration file to set the pins in specific directions (S, W, E, N). If not set, then the IO pins will be placed based on one of the other methods depending on the rest of the configurations. 
$<number> i.e. $1 can be used to place a virtual pin where <number> is the count of virtual pins. This can create separation between pins. 
You can also use @min_distance=<number> i.e. @min_distance=0.8 to set preferred min distance between pins in a specific direction. 
See spm configuration file as an example.
(Default: None)

Here’s the example mentioned above. In your case, this would add dummy pins above and below to push the real pins more towards the middlle.

#E
$5
*
$5