1# Copyright (c) 2012, 2015 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
7# to a hardware implementation of the functionality of the software
8# licensed hereunder. You may use the software subject to the license

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61 #
62 # A request incurs the frontend latency, possibly snoop filter
63 # lookup latency, and forward latency. A response incurs the
64 # response latency. Frontend latency encompasses arbitration and
65 # deciding what to do when a request arrives. the forward latency
66 # is the latency involved once a decision is made to forward the
67 # request. The response latency, is similar to the forward
68 # latency, but for responses rather than requests.
69 frontend_latency = Param.Cycles(3, "Frontend latency")
70 forward_latency = Param.Cycles(4, "Forward latency")
71 response_latency = Param.Cycles(2, "Response latency")
72
73 # Width governing the throughput of the crossbar
74 width = Param.Unsigned(8, "Datapath width per port (bytes)")
75
76 # The default port can be left unconnected, or be used to connect
77 # a default slave port
78 default = MasterPort("Port for connecting an optional default slave")
79
80 # The default port can be used unconditionally, or based on
81 # address range, in which case it may overlap with other
82 # ports. The default range is always checked first, thus creating

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90 cxx_header = "mem/noncoherent_xbar.hh"
91
92class CoherentXBar(BaseXBar):
93 type = 'CoherentXBar'
94 cxx_header = "mem/coherent_xbar.hh"
95
96 # The coherent crossbar additionally has snoop responses that are
97 # forwarded after a specific latency.
98 snoop_response_latency = Param.Cycles(4, "Snoop response latency")
99
100 # An optional snoop filter
101 snoop_filter = Param.SnoopFilter(NULL, "Selected snoop filter")
102
103 system = Param.System(Parent.any, "System that the crossbar belongs to.")
104
105class SnoopFilter(SimObject):
106 type = 'SnoopFilter'
107 cxx_header = "mem/snoop_filter.hh"
108
109 # Lookup latency of the snoop filter, added to requests that pass
110 # through a coherent crossbar.
111 lookup_latency = Param.Cycles(1, "Lookup latency")
112
113 system = Param.System(Parent.any, "System that the crossbar belongs to.")