updated READMe

README.md

@@ -10,3 +10,19 @@ source init_aoc_esa.sh
 
 **ofdock_taskpar_alt**: task-parallel version
 
+# Update to a new branch
+The FPGA program is made of 8 kernels: 
+
+         `IC`                   `IE`
+`GA` ->  `GG` -> `Conform` ->        -> `Store`
+         `LS`                   `IA`
+
+
+The access to off-chip memory in order to update population and energy values is made in `GA`, `IC`, `GG`, `LS`, and `Store`.
+The memory access seems to not be synchronized even though `mem_fence(CLK_GLOBAL_MEM_FENCE | CLK_CHANNEL_MEM_FENCE)` was used.
+
+According to [this forum post](https://www.alteraforum.com/forum/showthread.php?t=56402), it is better to make sure that memory accesses are performed within one kernel. 
+A new branch called `fusion` is create where `GA`, `IC`, `GG`, `LS`, and `Store` are merged into a single kernel `GA`.
+That way the design doesn't rely anymore on `mem_fence`s.
+
+