NCELAB sdf-annotate warning W*,SDFNMX

Hi Everybody,

I have a problem with a sdf-annotated netlist during elaboration before simulating it with ncsim.

I get the following output for severall cells during elaboration:

input C,D,SN;
      |
ncelab: *W,SDFNMX (/home/xxxxx/CORELIB_sdf3.0.v,1981|6): SDF annotation on  segment 'tb_registerbank.registerbank_i.dataout_control_i.\rd_cnt_reg[1] .C'  will be ignored.

Here is the corresponding part in the Verilog-Simulation-File:

module Flip-Flop (C,D,Q,QN,SN);

output Q,QN;
input C,D,SN; //line 1981

`ifdef functional
U_FD_P_SB_NO (buf_Q,D,C,SN,1'b1);
`else
reg notifier;
U_FD_P_SB_NO (buf_Q,D,C,SN,notifier);
`endif

buf (Q,buf_Q);
not (QN,buf_Q);

`ifdef functional
`else
 specify
 (posedge C => (Q:D)) = (1,1);
 (posedge C => (QN:D)) = (1,1);
 (SN => Q) = (1,1);
 (SN => QN) = (1,1);
 $setup(posedge D, posedge C, 0, notifier);
 $setup(negedge D, posedge C, 0, notifier);
 $recovery(posedge SN, posedge C, 0, notifier);
 $hold(posedge C, negedge D, 0, notifier);
 $hold(posedge C, posedge D, 0, notifier);
 $removal(posedge SN, posedge C, 0, notifier);
// $hold(posedge C, posedge SN, 0, notifier);
 $width(posedge C, 1, 0, notifier);
 $width(negedge C, 1, 0, notifier);
 $width(negedge SN, 1, 0, notifier);
endspecify
`endif

endmodule
`endcelldefine

I have changed this cell (and the other ones, that throw that warning), to make it sdf3.0-compliant. Ncelab finds all timing-arcs within the cell (at least it prints no errors, that it doesn't find one). I have to admit, I am not quite sure which timing-arc ncelab is ignoring.

Could anyone please tell me, where the error lies in the Verilog-Simulation-File (if any) or where to find an explanation for the ncelab error codes (see title)?

Another Problem with ncelab, that I am having, is that it is also ignoring INTERCONNECT timing arcs, which are 'interfacing' with a macrocell, that was going to be simulated as a transistor-netlist (no verilog-simulation-file does exist).

I'd appreciate any help, thank you.

Bye, PNR

Originally posted in cdnusers.org by PNR