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Uninitialized out port

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tj.diego

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Hi floks,
i'm back again with a new error!!! :)
i wrote the vhdl code of a kogge-stone radix-2 at 8 bit, but i can't run the simulation because i get this error:

Code:
[CODE]# vsim -voptargs=+acc work.ks_tb 
# Loading std.standard
# Loading std.textio(body)
# Loading ieee.std_logic_1164(body)
# Loading ieee.std_logic_arith(body)
# Loading ieee.std_logic_unsigned(body)
# Loading work.ks_tb(tb)
# Loading work.ks(arcks)
# Loading work.redblock(arcred)
# Loading work.yellowblock(arcyellow)
# Loading work.blueblock(arcblue)
# ** Warning: (vsim-WLF-5000) WLF file currently in use: vsim.wlf
#           File in use by:   Hostname:   ProcessID: 1
#           Attempting to use alternate WLF file "./wlftc4my1s".
# ** Warning: (vsim-WLF-5001) Could not open WLF file: vsim.wlf
#           Using alternate file: ./wlftc4my1s
# ** Warning: (vsim-8683) Uninitialized out port /ks_tb/uut/s9(8 downto 0) has no driver.
# This port will contribute value (UUUUUUUUU) to the signal network.
#         Region: /ks_tb
[/CODE]

here are the two file code:
View attachment koggestone.vhd.txtView attachment koggestoneTB.vhd.txt

Thanks a lot in advance

ps here there is the schematic at 16bit that i followed!
kogge.png
 

FvM

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Why don't you check the code yourself before posting? A brief view to the implementation of entity ks clarifies, that output s9 is never written.
 

tj.diego

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what a shame....i'm really sorry, i checked the code, but i didn't saw the error!
btw i thought that this kind of error are reported from the compiler!!! so i was looking for some more important error!!!
thanks again!
 

mrflibble

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btw i thought that this kind of error are reported from the compiler!!!

You mean like this?

# ** Warning: (vsim-8683) Uninitialized out port /ks_tb/uut/s9(8 downto 0) has no driver
 

tj.diego

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You mean like this?

# ** Warning: (vsim-8683) Uninitialized out port /ks_tb/uut/s9(8 downto 0) has no driver

i expected something like "the port s(8 downto 0) doesn't exist"

btw i'm learning how the compiler talk to me! :)
 

mrflibble

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i expected something like "the port s(8 downto 0) doesn't exist"

btw i'm learning how the compiler talk to me! :)

I know how you feel. Sometimes the messages can be reasonably cryptic. But you get used to it. ;) What does help however is for every new warning you don't recognize yet: cut & paste the warning into google. You learn a whole lot that way. :)
 

tj.diego

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i did it, but this time didn't work, btw thanks a lot for your advices!!! :)
 

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