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sroute blockring connectivity

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neo_anderson

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Hi,

After addstripes, I run the sroute.
I have a lot of memory blocks in my design around the corners.

As i perform sroute, I see that my vdd! nets (the followpins) is not connected to the blockring but it managed to place via for the gnd! followpins.
Similarly at the IO pads, the gnd! nets of the followpins is not connected but vdd! gets connected.

Any help would be appreciated.

Thanks a lot,
 

With vdd! gnd! you mean these are inherited power terminals ?
 

pamm2020 said:
With vdd! gnd! you mean these are inherited power terminals ?
Click to expand...

Hi yes they are, net name gnd! and pin gnd!, same for the vdd!
globalNetConnect performed.

In addtion, I also get the following warning message with sroute: (sroute performed before placement)

Begin power routing ...
**WARN: (ENCSR-1253): Net vdd! does not have standard cells to be routed. Please check net list.
**WARN: (ENCSR-1253): Net gnd! does not have standard cells to be routed. Please check net list.
**WARN: (ENCSR-468): No core cells defined in COMPONENTS section
and/or No core cells defined in SPECIALNETS vdd!
**WARN: (ENCSR-468): No core cells defined in COMPONENTS section
and/or No core cells defined in SPECIALNETS vdd!
**WARN: (ENCSR-468): No core cells defined in COMPONENTS section
and/or No core cells defined in SPECIALNETS gnd!

Thanks
 

To add more to the previous question,
Is there an option to make the Sroute to connect block pins/nets outward to a stripe or ring.

The encounter is not able to place the vdd! net via because it might short the gnd!, so Is it possible extend the ring outside and connect to the respective followpins.

Thanks again.
 

neo_anderson said:
Hi yes they are, net name gnd! and pin gnd!, same for the vdd!
globalNetConnect performed.

In addtion, I also get the following warning message with sroute: (sroute performed before placement)

Begin power routing ...
**WARN: (ENCSR-1253): Net vdd! does not have standard cells to be routed. Please check net list.
**WARN: (ENCSR-1253): Net gnd! does not have standard cells to be routed. Please check net list.
**WARN: (ENCSR-468): No core cells defined in COMPONENTS section
and/or No core cells defined in SPECIALNETS vdd!
**WARN: (ENCSR-468): No core cells defined in COMPONENTS section
and/or No core cells defined in SPECIALNETS vdd!
**WARN: (ENCSR-468): No core cells defined in COMPONENTS section
and/or No core cells defined in SPECIALNETS gnd!

Thanks
Click to expand...

Did you check the name of power/ground in the lef files? Is it really vdd! and gnd! as you have used?

Thanks.
 

hairo said:
Did you check the name of power/ground in the lef files? Is it really vdd! and gnd! as you have used?

Thanks.
Click to expand...

Thanks for your message.
Yes the LEF file contains the pins vdd! and gnd!
But I am not sure, whether it should also contain the "CLASS CORE" under PIN too. (which actually present under Macro definition)

Here is a part of the LEF file of a macro
PIN vdd!
DIRECTION INOUT ;
USE POWER ;
SHAPE ABUTMENT ;
PORT
LAYER ;

*********
Thanks again
 

I suggest you to check your netlist. Also put LEF for one complete cell for further analysis. Hope you are using LEF files for Encounter P&R. (not the other option - using tech.db in case of OA database)
 

Thanks again for your remarks. I will try to put soon the LEF file.
The thing that i cannot understand is, it works well for one of the POWER nets.
Is there an option is sroute that I could allow the ring to extend outwards to connect to the followpins ?? The situation is now it trys or connects inside the ring. But it is true it is not possible to connect both POWER to ring without outward extension as it would short the other, so sroute leaves it open.

Thanks again.
 

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