pbus.v

xilinx ISE 实例代码。可用ISE直接打开

module pbus(
  iOUT_PORT,
  iREAD_STROBE,
  iWRITE_STROBE,
  iPORT_ID,
  oIN_PORT,
  
  iDATARD_0,
  iDATARD_1,
  iDATARD_2,
  
  oADDR,
  oRD,
  oWR,
  oDATAWR
);

input [ 7: 0]  iOUT_PORT    ;  // The data output of PicoBlaze 8 bits
input          iREAD_STROBE ;  // The Read operation signal of PicoBlaze
input          iWRITE_STROBE;  // The Write operation siganl of PicoBalze
input [ 7: 0]  iPORT_ID     ;  // The Port ID number. Sth like address of Bus
output[ 7: 0]  oIN_PORT     ;  // The data input of PicoBlaze 8 bits
  
input [ 7: 0]  iDATARD_0;      // The data input from  device 0     
input [ 7: 0]  iDATARD_1;      // The data input from  device 1     
input [ 7: 0]  iDATARD_2;      // The data input from  device 2     
  
output[ 7: 0]  oADDR  ;        // The address of device       
output         oRD    ;        // The read signal of PBus       
output         oWR    ;        // The write signal of PBus       
output[ 7: 0]  oDATAWR;        // The data output of PBus       

wire  [ 7: 0]  s_in_port;

assign oDATAWR = iOUT_PORT;
assign oRD     = iREAD_STROBE;
assign oWR     = iWRITE_STROBE;
assign oADDR   = iPORT_ID;

assign s_in_port = iDATARD_0 | iDATARD_1 ;

assign oIN_PORT = s_in_port | iDATARD_2 ;


endmodule