auto reset / rs 232

Hi everyone,

I have 2 unrelated questions:

1) I have a Xilinx ML505 board and I am looking for a way to make my
SRAM power cycle automatically. Ideally I would like the SRAM to power
off, then power on again after 30 seconds or more. Is there any way to
have either the SRAM individually, or the board as a whole, do this?

2) The ML505 schematics say the RS 232 port is DTE, while the User
Guide says it is DCE. Can anyone confirm which is correct? Do I need a
null-modem cable or a straight-through cable to connect to a PC?

Thank you,

Robyn Colopy

On Feb 2, 2:22=A0pm, fbob <fantasma...@gmail.com> wrote:
> Hi everyone,
>
> I have 2 unrelated questions:
>
> 1) I have a Xilinx ML505 board and I am looking for a way to make my
> SRAM power cycle automatically. Ideally I would like the SRAM to power
> off, then power on again after 30 seconds or more. Is there any way to
> have either the SRAM individually, or the board as a whole, do this?
>
> 2) The ML505 schematics say the RS 232 port is DTE, while the User
> Guide says it is DCE. Can anyone confirm which is correct? Do I need a
> null-modem cable or a straight-through cable to connect to a PC?

If you have the schematics, you can find out if the driver is on pin 2
or pin 3 of the DB-9 connector telling you how to wire the cable.

I'm not familiar with this board.  Does it have jumpers to allow pin 2
and 3 to be swapped?

Rick

On Mon, 2 Feb 2009 12:25:34 -0800 (PST), rickman <gnuarm@gmail.com>
wrote:

>On Feb 2, 2:22&#4294967295;pm, fbob <fantasma...@gmail.com> wrote:
>> Hi everyone,
>>
>> I have 2 unrelated questions:

>> 2) The ML505 schematics say the RS 232 port is DTE, while the User
>> Guide says it is DCE. Can anyone confirm which is correct? Do I need a
>> null-modem cable or a straight-through cable to connect to a PC?
>
>If you have the schematics, you can find out if the driver is on pin 2
>or pin 3 of the DB-9 connector telling you how to wire the cable.
>
>I'm not familiar with this board.  Does it have jumpers to allow pin 2
>and 3 to be swapped?

I don't believe it does, and DTE vs DCE is one of those naming
conventions that is pretty much lost in the mists of time, asong with
25-pin RS232 connectors.

But you do need a null-modem cable to connect to a PC's serial port.

- Brian