Re: [oc] UART16550 core

[khchang@haco.co.kr]

----- 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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