RE: [oc] uart modem outputs

["Leo Jarillas" <leo.jarillas@eazix.com>]

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
> 
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