SWD (serial wire debug) is a debug interface ARM provided in replacement of the usual JTAG interface. The advantage is obvious: 2 wires needed vs. 4 wires. If you want to instantiate the ARM core in FPGA with SWD interface. Here is how you do it.

1. Declare Pin signals

    inout  SWDIO, 
    input  SWCLK,

2. Config the ARM core to use SWD instead of JTAG.
It is usually through a compile time parameter setting.

3. Connect the signals

    wire   TCK;

    // Optional BUFR for SWCLK, may help in timing
    .O (TCK),
    .I (SWCLK));

    assign swclk = TCK ;
    assign swdi  = SWDIO ;
    bufif1 (SWDIO, swdo, swden) ;


Pretty simple, right? Let us know how it works for you.

How to Instantiate ARM core with SWD in FPGA
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