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Message
From: khchang@h...
Date: Thu, 24 Apr 2003 06:31:44 -0100
Subject: Re: [oc] UART16550 core
----- Original Message -----
From: ddresdner@p...
To: carl@o... , cores@o...
Date: Mon, 30 Sep 2002 23:33:16 -0100
Subject: Re: [oc] UART16550 core
>
>
> Igor,
>
> I would very much like to get a copy of your VHDL version of the
> 16550
> Uart. We would like to use it in a project that we are working on.
> Would
> it be possible to get the source for that. I would appreciated it.
>
> Thank you,
> Danny Dresdner
>
> ddresdner@p...
>
> ----- Original Message -----
> From: "Carl van Schaik" <carl@o... >
> To: <cores@o... >
> Date: Tue, 7 Aug 2001 08:04:19 +0200
> Subject: Re: [oc] UART16550 core
>
> >
> >
> > Hi Igor,
> >
> > > so if I understand correctly, there are two versions, one
> in
> > Verilog that
> > > was downloaded
> > > from the opencores and one in VHDL that you wrote
> (perhaps
> > opencores files
> > > translated to
> > > VHDL and than changed).
> > This is correct except that the Verilog was not simply
> converted to
> > VHDL.
> > I have written UART's before and used the Verilog code mainly
> as an
> > example
> > for my own code for the 16550.
> >
> > > I don't know which ones to take for testing. I'm a
> verilog
> > guy, not VHDL,
> > > although I would
> > > take the VHDL files if they contain less bugs than the
> ones in
> > verilog.
> >
> > Well, from what I saw, the Verilog version has a few bugs. The
> main
> > ones I
> > noticed are:
> >
> > FIFO - not cleared when data is popped out(empty). - Error
> bits
> > could remain
> > Break detection looked a bit weird (but I'm not a Verilog
> person)
> > Stop_bits signal in LCR(Line control register) is not used.
> > Only 16550 mode is supported, not 16540.
> > Break error is not passed through the FIFO!
> > Reciever will continue to recieve (0's) after a break is
> detected.
> >
> > > Can you tell me if I'm correct about the differences.
> > >
> > > In the meantime I'll start with the Verilog files.
> > >
> > > Regards,
> > > Igor
> >
> > regards
> > Carl
> >
>
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