support Kintex XC7K420T

doc/FPGAs.yml

@@ -187,6 +187,7 @@ Xilinx:
       - xc7k160t
       - xc7k325t
       - xc7k410t
+      - xc7k420t
     URL: https://www.xilinx.com/products/silicon-devices/fpga/kintex-7.html#productTable
     Memory: OK
     Flash: OK

src/part.hpp

@@ -30,6 +30,7 @@ static std::map <int, fpga_model> fpga_list = {
 	{0x0364c093, {"xilinx", "kintex7", "xc7k160t", 6}},
 	{0x03651093, {"xilinx", "kintex7", "xc7k325t", 6}},
 	{0x03656093, {"xilinx", "kintex7", "xc7k410t", 6}},
+	{0x23752093, {"xilinx", "kintex7", "xc7k420t", 6}},
 
 	{0x13822093, {"xilinx", "kintexus", "xcku040", 6}},