#5 Added short queues on beam streams before arbiter

Author: krichardsson

Makefile

@@ -17,7 +17,7 @@ $(PROJ).json: LighthouseTopLevel.v
 	yosys -p 'read_verilog LighthouseTopLevel.v; read_verilog  blackboxes.v; synth_ice40 -top LighthouseTopLevel; write_json $@'
 
 %.asc: %.json $(PIN_DEF)
-	nextpnr-ice40 --seed 15 --up5k --json $< --asc $@ --pcf $(PIN_DEF)
+	nextpnr-ice40 --seed 18 --up5k --json $< --asc $@ --pcf $(PIN_DEF)
 
 %.bin: %.asc
 	icepack $< $@

src/main/scala/lighthouse/Lighthouse.scala

@@ -19,7 +19,7 @@ class LighthouseTopLevel(nSensors: Int = 4,
                          frequency: HertzNumber = 48 MHz,
                          useDdrDecoder: Boolean = true,
                          uartBaudrate: HertzNumber = 230400 Hz,
-                         decodershortDelay: TimeNumber = 124 ns, 
+                         decodershortDelay: TimeNumber = 124 ns,
                          decoderUnsyncDelay: TimeNumber = 235 ns
                         ) extends Component {
   val io = new Bundle {
@@ -83,7 +83,7 @@ class LighthouseTopLevel(nSensors: Int = 4,
   val core = new ClockingArea(clkCtrl.coreClockDomain) {
 
     val beamWords = Vec(Stream(Bits(17 bits)), nSensors)
-    
+
     for (sensor <- 0 until nSensors) {
       // DDR IOs ...
       val ioE = SB_IO.ddrRegistredInout
@@ -178,7 +178,7 @@ class LighthouseTopLevel(nSensors: Int = 4,
         beamWord := 0
       }
 
-      idBeamWords(sensor) << idBeamWord.toStream
+      idBeamWords(sensor) << idBeamWord.toStream.queue(2)
     }
 
     // Create the combined beam stream.
@@ -274,7 +274,7 @@ import spinal.core.sim._
 
 object TopLevelSim {
   def main(args: Array[String]): Unit = {
-    
+
     SimConfig.allOptimisation
             .addSimulatorFlag("-Wno-PINMISSING -I../../sim_rtl")
             .withWave
@@ -382,7 +382,7 @@ object TopLevelSimWithSalaeData {
 
     var d = false
     var e = false
-    
+
 
     SimConfig.allOptimisation
             .addSimulatorFlag("-Wno-PINMISSING -I../../sim_rtl")
@@ -453,4 +453,4 @@ object TopLevelSimWithSalaeData {
       simSuccess()
     }
   }
-}
+}