Re: [oc] uart modem outputs

[Jacob Gorban <jacobg@flextronics.co.il>]

That's correct,

In the document I was referring to the actual output on the RS232 line,
after the transceiver. 
I accept that it might be a bit misleading.

Jacob.

> Ah. Ok.  Then it means that the DTR and RTS the document was referring
> to was the signal after the transceiver... and not the pads...
> 
> Thanks.
> 
> Leo
> 
> -----Original Message-----
> From: John Sheahan [mailto:jrsheahan@optushome.com.au] 
> Sent: Friday, June 06, 2003 1:00 PM
> To: cores@opencores.org
> Subject: Re: [oc] uart modem outputs
> 
> I think the pin name is the issue - DTR and RTS are 
> active low outputs as they are intended to be used 
> with inverting line drivers.
> 
> which would imply the RTL and the docs are correct.
> The top level entity name is wrong.
> john
> 
> 
> 
> On Fri, Jun 06, 2003 at 11:40:22AM +0800, Leo Jarillas wrote:
> >   Hi.  I was looking at the UART16550 core and want to clarify
> > something.  On the pdf document (UART Core Specification), it is
> > indicated on section 4.6 Modem Control Register that the value of RTS
> > and DTR (these are RTS_PAD_O and DTR_PAD_O right?) are the complement
> of
> > what is set on the MCR.  But in uart_regs.v, I found these assignments
> > 
> > assign	rts_pad_o = mcr[`UART_MC_RTS];
> > assign	dtr_pad_o = mcr[`UART_MC_DTR];
> > 
> >   I didn't found anywhere in the code a statement that will assign the
> > complement of the MCR value to RTS/DTR.  Which is correct? The
> document
> > or the code?  Please clarify.  
> > 
> > Thank you very much.
> > 
> > Leo
> > 
> > --

-- 
Jacob Gorban <jacobg@flextronics.co.il>

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