problems with uart on a tri-state bus

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Check the polarity of your control signals. RST, RD and WR are active low, but CS is active high in your SOPC project.

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i read the datasheet of the 16750 uart and i got the conclusion that CS, RD and WR are all active low, but reading the vhdl code of the core (i downloaded the uart from opencores.org) i think RD, WR and CS are active high... now i'm a little bit confused...

here is the .vhdl file for the uart... if you could check it out to confirm me the polarity of the signals it will be really helpful to me! thanks.