Alex <[email protected]> wrote:
> On 2 ???, 09:14, glen herrmannsfeldt <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 board 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.

> I also had this thought until had noticed that MAXIM UART device is
> mentioned on page 61 of ug257:

It is just a level converter. The MAXIM MAX3232 device is popular
as it needs only +3.3V power, not the +/-12V used by most RS232
level converters. The MAX232 I used to know uses +5V, it
seems that there is now a 3.3V version. The capacitors are
used to generate the required voltages.

-- glen