|
Message
From: Jacob Gorban <jacobg@f...>
Date: Fri, 06 Jun 2003 13:27:06 +0200
Subject: Re: [oc] uart modem outputs
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@o...]
> Sent: Friday, June 06, 2003 1:00 PM
> To: cores@o...
> 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@f...>
|
 |
Browse
