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I have a RTL which after synthesis looks as in the snippet mentioned below..
wire [2:0] seed_inp; wire [2:0] seed_outp;
wire scan_5_q, scan_9_q, scan_10_n_0, scan_10_q, scan_11_n_0, scan_11_q, scan_12_n_0, scan_12_q; wire scan_fix0_6_n_0, scan_fix0_6_n_1, scan_fix0_6_q, scan_fix0_8_n_6, scan_fix0_8_n_8, scan_fix0_8_n_14, scan_fix1_2_n_0, scan_fix1_2_q; df1qpdw scan_10_q_reg(.CP (clk), .D (scan_10_n_0), .Q (scan_10_q)); mx21x2pdw scan_10_g22(.D0 (seed_inp), .D1 (scan_10_q), .S0 (scan), .Z (scan_10_n_0));
I wanted RTL compiler to take the above sinppet as
df1qpd scan_8_q_reg(.CP (clk), .D (seed_outp), .Q (scan_8_q));
mx21x2pd scan_8_g20(.D0 (seed_inp), .D1 (scan_8_q), .S0 (scan), .Z (seed_outp));
Functionality wise both are same but I am getting unnconnected in the netlist because of this issue..
wire [2:0] seed_inp; wire [2:0] seed_outp;
Is as written in the RTL and scan_9* scan_10* etc are as written out by RTL compiler after synthesis.
Is there a way I can force the RTL compiler not to use its own wire names but to retain the wire names as written in RTL ?
I believe you are looking for this
attribute name: write_vlog_preserve_net_name category: write (controls write output) object type: root access type: read-write data type: boolean default value: false help: Determines whether to preserve net names present in user input or not.
Note that dangling wires resulting in incorrectly implemented functionality would be a bug in the tool. Did you run LEC ? I suspect if the wire became unconnected it probably could be optimized out but obviously I have no knowledge of RTL or functionality
In reply to grasshopper:
I could not find that command in the manual. But some how that also did not help. May be I will try different version of RTL compiler and check.
The signal was getting optimized out. I have one generic question to you. How does these unconnected or optimised nets gets handled
during PNR. I mean if the gate levels has few ports as "unconnected" how does this gets sorted out during further stages, will it be tied off?