interconnect/packet/PacketFIFO: +1 on param_depth to allow dequeuing …

…current while equeuing next.

litex/soc/interconnect/packet.py

@@ -379,6 +379,7 @@ def __init__(self, layout, payload_depth, param_depth=None, buffered=False):
  # Create the FIFOs.
  payload_description = stream.EndpointDescription(payload_layout=payload_layout)
  param_description = stream.EndpointDescription(param_layout=param_layout)
+ param_depth = param_depth + 1 # +1 to allow dequeuing current while enqueuing next.
  self.submodules.payload_fifo = payload_fifo = stream.SyncFIFO(payload_description, payload_depth, buffered)
  self.submodules.param_fifo = param_fifo = stream.SyncFIFO(param_description, param_depth, buffered)