warning from ISE 9.2
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From: Thorsten Kiefer on 6 May 2008 11:29 Hi, waht does that mean : Loading device for application Rf_Device from file '3s200.nph' in environment /home/thorsten/Xilinx92i. WARNING:Xst:2677 - Node <b_reg_0> of sequential type is unconnected in block <ps2_rx>. WARNING:Xst:2677 - Node <b_reg_1> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_2> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_3> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_4> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_5> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_6> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_7> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_8> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_9> of sequential type is unconnected in block <ps2rx>. WARNING:Xst:2677 - Node <b_reg_10> of sequential type is unconnected in block <ps2rx>. ========================================================================= Advanced HDL Synthesis Report ?? Regards TK
From: Thorsten Kiefer on 6 May 2008 11:59 Thorsten Kiefer wrote: > Hi, > waht does that mean : > > Loading device for application Rf_Device from file '3s200.nph' in > environment /home/thorsten/Xilinx92i. > WARNING:Xst:2677 - Node <b_reg_0> of sequential type is unconnected in > block <ps2_rx>. > WARNING:Xst:2677 - Node <b_reg_1> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_2> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_3> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_4> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_5> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_6> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_7> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_8> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_9> of sequential type is unconnected in > block <ps2rx>. > WARNING:Xst:2677 - Node <b_reg_10> of sequential type is unconnected in > block <ps2rx>. > > ========================================================================= > Advanced HDL Synthesis Report > > ?? > > Regards > TK The warning appears only of I prepend a '1' to b_reg : b_next <= '1' & b_reg(10 downto 1); If I write b_next <= '0' & b_reg(10 downto 1); no warning is generated.
From: Dave on 6 May 2008 12:15
On May 6, 11:59 am, Thorsten Kiefer <webmas...(a)nillakaes.de> wrote: > Thorsten Kiefer wrote: > > Hi, > > waht does that mean : > > > Loading device for application Rf_Device from file '3s200.nph' in > > environment /home/thorsten/Xilinx92i. > > WARNING:Xst:2677 - Node <b_reg_0> of sequential type is unconnected in > > block <ps2_rx>. > > WARNING:Xst:2677 - Node <b_reg_1> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_2> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_3> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_4> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_5> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_6> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_7> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_8> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_9> of sequential type is unconnected in > > block <ps2rx>. > > WARNING:Xst:2677 - Node <b_reg_10> of sequential type is unconnected in > > block <ps2rx>. > > > ========================================================================= > > Advanced HDL Synthesis Report > > > ?? > > > Regards > > TK > > The warning appears only of I prepend a '1' to b_reg : > b_next <= '1' & b_reg(10 downto 1); > > If I write > b_next <= '0' & b_reg(10 downto 1); > no warning is generated. I would suspect that hard-coding that bit to a '1' is causing your code to ignore the value of the entire vector wherever it is used, so it may be getting optimized away. You would really have to look at the rest of your code, and the context of the statement you gave above. Bang your head against the wall for a while and think about it. Pore over your code. Staring at a problem you don't understand and researching it on your own can be great ways to become a better engineer. If you're still stuck after a couple days of that, come back with more code and anything new you've learned. |