使用外部分频器，面积没有变化

src/main/scala/backBoard/BackBoardSlv.scala

@@ -12,6 +12,7 @@ class BackBoardSlvIO extends Bundle{
   val oser_fclk = Input(Bool())
   val ides_pclk = Input(Bool())
   val ides_fclk = Input(Bool())
+  val clk8us = Input(Bool())
 
   val lvds_down_din  = Input(Bool())
   val lvds_down_dout = Output(Bool())