On Mon, 1 Feb 2010 23:01:47 -0800 (PST), Alex <[email protected]>
wrote:

|Hello All,
|
|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.
|The Xilinx board's manual (ug257) does not say what particular UART is
|present on the board and just mention some MAXIM chip but where it is
|on board?
|
|The manual (ug257) also specifies connection between particular FPGA
|and RS232 pins on this board:
|for DTE
|
|NET "RS232_DTE_RXD" LOC = "U8" | IOSTANDARD = LVTTL ;
|NET "RS232_DTE_TXD" LOC = "M13" | IOSTANDARD = LVTTL | DRIVE = 8 |
|SLEW = SLOW ;
|
|and for DCE
|
|NET "RS232_DCE_RXD" LOC = "R7" | IOSTANDARD = LVTTL ;
|NET "RS232_DCE_TXD" LOC = "M14" | IOSTANDARD = LVTTL | DRIVE = 8 |
|SLEW = SLOW ;
|
|-----------------

The board is made by Digilent Inc for Xilinx and is sold on Digilent's
web page also.

The Max part is MaX3232 per the schematic.

james