[Resolved]Saturn - Channel B Serial Communications

I need to use the Saturn Channel B to communicate with my serial rx/tx modules.

In the Saturn .ucf file we have rxf, txe, rd, wr and siwua.

NET "rxf" LOC = "K18" | IOSTANDARD = LVTTL;
NET "txe" LOC = "K17" | IOSTANDARD = LVTTL;
NET "rd" LOC = "J18" | IOSTANDARD = LVTTL | SLEW = FAST | DRIVE = 8 ;
NET "wr" LOC = "J16" | IOSTANDARD = LVTTL | SLEW = FAST | DRIVE = 8 ;
NET "siwua" LOC = "H18" | IOSTANDARD = LVTTL | SLEW = FAST | DRIVE = 8 ;

What does each of these mean? The diagram and schematics do not explain.

On the MojoV3 FGPA .ucf file we have avr_tx and avr_rx:

NET "avr_tx" LOC = P55 | IOSTANDARD = LVCMOS33;
NET "avr_rx" LOC = P59 | IOSTANDARD = LVCMOS33;

For the MojoV3 I simply pass the avr_tx and avr_rx to the rx and tx verilog modules.

Code:

        serial_rx #(.CLK_PER_BIT(CLK_PER_BIT)) serial_rx (
                .clk(clk),
                .rx(avr_tx),
                .data(rx_data),
                .new_data(new_rx_data)
        );

        serial_tx #(.CLK_PER_BIT(CLK_PER_BIT)) serial_tx (
                .clk(clk),
                .tx(avr_rx),
                .busy(tx_busy),
                .data(tx_data),
                .new_data(new_tx_data)
        );

How do I use the Saturn to communicate to/from the FPGA over Serial/USB (Channel B) in a similar manner?

Thanks

 

This seems to be working in that I receive data in response to my request sent to the device where previously nothing would be received. Since the data is repeating the same byte (15) there is still something wrong however. Do you have any example serial verilog that is known working on this device?

Thank You

 

@connorj:
This code is for the Mimas V2, but the general concept is the same. All you'll really need to do to get it to work with the Saturn is remove all the parts relating to the 7-segment displays and change the pin names in the UCF file to match the ones posted here.

Edit: I wound up wanting some example code for myself, so I made the necessary modifications and posted them here.

 

I have serial communications working ok now. Thanks everybody.