+ wb_delay = Param.Latency('10ns', "delay before desc writeback occurs")
+ fetch_delay = Param.Latency('10ns', "delay before desc fetch occurs")
+ fetch_comp_delay = Param.Latency('10ns', "delay after desc fetch occurs")
+ wb_comp_delay = Param.Latency('10ns', "delay after desc wb occurs")
+ tx_read_delay = Param.Latency('0ns', "delay after tx dma read")
+ rx_write_delay = Param.Latency('0ns', "delay after rx dma read")
+