>On 2 =D1=84=D0=B5=D0=B2, 09:14, glen herrmannsfeld
<g...@ugcs.caltech.edu>=
> wrote:
>> Alex <vict...@gmail.com> wrote:
>> > I have started using Xilinx Spartan3E 1600E Microblaze Development
>> > Board and want to use its RS232 facility in my project. This boar
has
>> > two RS232 connectors but I cannot figure out what UART it uses. I was
>> > searching for UART chip on the board (I was actually searching for a
>> > MAXIM chip) and have seen none.
>>
>> It would be unusual to put a UART on an FPGA development board.
>>
>> You should implement one in the FPGA logic.
>>
>> -- glen
>
>I also had this thought until had noticed that MAXIM UART device is
>mentioned on page 61 of ug257:
>
>The FPGA supplies serial output data using LVTTL or LVCMOS levels to
>the Maxim device,
>which in turn, converts the logic value to the appropriate RS-232
>voltage level. Likewise,
>the Maxim device converts the RS-232 serial input data to LVTTL levels
>for the FPGA. A
>series resistor between the Maxim output pin and the FPGA=E2=80=99s RX
pin
>protects against
>accidental logic conflicts.
>
>I am really puzzled!
>
>

A logic-level <-> RS232 converter is not a UART. It is a PHY.

As other posters have said, you put the UART (roughly equivalent to a MAC
into the FPGA, using a process known as "digital design".

If you only need one line speed, drop the 'U', and design an 'ART'.

HTH!


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