--- /dev/null
+from nmigen import Signal
+
+class LoadStoreUnitInterface:
+ def __init__(self):
+
+ #self.dbus = Record(wishbone_layout)
+
+ self.x_addr = Signal(32) # The address used for loads/stores
+ self.x_mask = Signal(4) # Mask of which bytes to write
+ self.x_load = Signal() # set to do a memory load
+ self.x_store = Signal() # set to do a memory store
+ self.x_store_data = Signal(32) # The data to write when storing
+ self.x_stall = Signal() # input - do nothing until low
+ self.x_valid = Signal()
+ self.m_stall = Signal() # input - do nothing until low
+ self.m_valid = Signal() # when this is high and m_busy is
+ # low, the data for the memory load can be read from m_load_data
+
+ self.x_busy = Signal() # set when the memory is busy
+ self.m_busy = Signal() # set when the memory is busy
+ self.m_load_data = Signal(32) # Data returned from a memory read
+ self.m_load_error = Signal() # Whether there was an error when loading
+ self.m_store_error = Signal() # Whether there was an error when storing
+ self.m_badaddr = Signal(30) # The address of the load/store error