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I'm having some trouble with getting RTL compiler to recognise more complex standard cells. I am trying to synthesize a simple binary counter with a T flip flop. For some reason the tool is unable to recognise the function of the T flip flop, which was characterized using Encounter Library Characterizer and a .lib file was written without any problems.
The flip flop also posesses a second output with a combinational timing arc, which is used to enable subsequent T flip flops in a counter. RTL compiler gives some warning about multi-function cells and then fails to identify the function of the cell.
Is there any way to make RTL Compiler recognise these types of cells or will simpler cells have to be used? The more complex cells are required for area optimization.
RC does indeed support MOGs (multi-output gates) such as compressor cells, etc. However your versions is 2-3 years old and officially unsupported. I suggest you move to RC10.1.302 from http://downloads.cadence.com
In reply to grasshopper:
Are these typs of cells not supported by the older versions?
At the moment I only really need a simple T flip flop for synthesis but it seems that this will not be possible. I dont understand why this flip flop should have this much difficulty when D flip flops work so easily. Could it be due to the unknown initial state of the T flip flop that RTL Compiler refuses to use it?
In reply to eklikeroomys:
MOGs were not always supported - not sure at what point the support was added. What is preventing migration to 10.1 ? Seems like getting support for MOGs and all the other fixes and enhancements would be more than enough of a reason.
As I'm not in charge of the software management part of things here its not that easy, but will look into it, thanks gh.