Add Murax 0.55 DMIPS/Mhz

README.md

@@ -222,16 +222,18 @@ There is some measurements of Briey SoC timings and area :
 ## Murax SoC
 
 Murax is a very light SoC (fit in ICE40 FPGA) which could work without any external component.
-
+- VexRiscv RV32I[M]
-- ICE40-hx8k + icestorm =>  53 Mhz, 2142 LC
-- 0.37 DMIPS/Mhz
-- 8 kB of on-chip ram
 - JTAG debugger (eclipse/GDB/openocd ready)
+- 8 kB of on-chip ram
 - Interrupt support
 - APB bus for peripherals
 - 32 GPIO pin
 - one 16 bits prescaler, two 16 bits timers
 
+Depending the CPU configuration, on the ICE40-hx8k FPGA with icestorm for synthesis, the full SoC will get following area/performance :
+- RV32I interlocked stages => 53 Mhz, 2142 LC 0.37 DMIPS/Mhz
+- RV32I bypassed stages    => 53 Mhz, 2463 LC 0.55 DMIPS/Mhz
+
 You can find its implementation there : src/main/scala/vexriscv/demo/Murax.scala
 
 
@@ -253,7 +255,7 @@ To connect OpenOCD (https://github.com/SpinalHDL/openocd_riscv) to the simulatio
 src/openocd -f tcl/interface/jtag_tcp.cfg -c "set MURAX_CPU0_YAML /home/spinalvm/Spinal/VexRiscv/cpu0.yaml" -f tcl/target/murax.cfg
 ```
 
-There is some measurements of Murax SoC timings and area : 
+There is some measurements of Murax SoC timings and area for the 0.37 DMIPS/Mhz SoC version :
 
 ```
 Murax ->

src/main/scala/vexriscv/demo/Murax.scala

@@ -29,6 +29,10 @@ import vexriscv.{plugin, VexRiscvConfig, VexRiscv}
 
 case class MuraxConfig(coreFrequency : HertzNumber,
                        onChipRamSize : BigInt,
+                       bypassExecute : Boolean,
+                       bypassMemory: Boolean,
+                       bypassWriteBack: Boolean,
+                       bypassWriteBackBuffer : Boolean,
                        pipelineDBus : Boolean,
                        pipelineMainBus : Boolean,
                        pipelineApbBridge : Boolean){
@@ -39,6 +43,10 @@ object MuraxConfig{
   def default =  MuraxConfig(
       coreFrequency         = 12 MHz,
       onChipRamSize         = 8 kB,
+      bypassExecute         = false,
+      bypassMemory          = false,
+      bypassWriteBack       = false,
+      bypassWriteBackBuffer = false,
       pipelineDBus          = true,
       pipelineMainBus       = false,
       pipelineApbBridge     = true
@@ -158,10 +166,10 @@ case class Murax(config : MuraxConfig) extends Component{
           new LightShifterPlugin,
           new DebugPlugin(debugClockDomain),
           new HazardSimplePlugin(
-            bypassExecute = false,
+            bypassExecute = bypassExecute,
-            bypassMemory = false,
+            bypassMemory = bypassMemory,
-            bypassWriteBack = false,
+            bypassWriteBack = bypassWriteBack,
-            bypassWriteBackBuffer = false,
+            bypassWriteBackBuffer = bypassWriteBackBuffer,
             pessimisticUseSrc = false,
             pessimisticWriteRegFile = false,
             pessimisticAddressMatch = false