EXTERNAL PORTS
These are the external ports defined in the MHS file.
Attributes Key
CLK  are clock ports 
INTR  are interrupt ports 
BUF or REG  are ports that instantiate or infer IOB primitives: 
# NAME DIR [LSB:MSB] SIG ATTRIBUTES
0GLB sys_rst_pin I 1 sys_rst_s
1A fpga_0_RS232_DCE_RX_pin I 1 fpga_0_RS232_DCE_RX
2A fpga_0_RS232_DCE_TX_pin O 1 fpga_0_RS232_DCE_TX
3B sys_clk_pin I 1 dcm_clk_s