Changes between Initial Version and Version 1 of Component/Vci Vgmn

Timestamp:

May 5, 2007, 10:07:54 PM (17 years ago)

Author:

alain

Comment:

--

Component/Vci Vgmn

@@ +1 @@
+[wiki:Component SocLib Components General Index] 
+
+= !VciVgmn Functional Description =
+
+This hardware component is a generic micro-network respecting the
+VCI advanced protocol. It behaves as two fully independent packet switched
+network for VCU commands and VCI responses, and supports several
+simultaneous transaction.
+When several initiators try to reach the same target, the arbitration
+policy is round-robin.
+It gives the system designer a generic "communication black-box" with
+a parametrized number of VCI initiator ports (NB_INITIATOR), 
+and a parameterized number of VCI target ports (NB_TARGET). 
+This component can be used to build a "flat" interconnect, where
+all VCI initiators and targets are identified by a single index:
+ * The VCI targets must be indexed from 0 to (NB_TARGET - 1).
+ * The VCI initiators must be indexed from 0 to (NB_INITIATOR - 1).
+
+As any VCI advanced compliant interconnect, this component uses
+the MSB bits of the VCI ADDRESS field to route the command packets
+to the proper target, thanks to a routing table, implemented as a ROM.
+This routing table is build by the constructor from the informations stored in
+the [wiki:MappingTable mapping table].
+It uses the VCI RSRCID field to route the response packet to the initiator.
+
+This component has two "structural" parameters, that can be used to fit
+the behaviour of a specific physical micro-network:
+ * The !MinLatency parameter is a number of cycles that defines the latency of an empty network.
+ * The !FifoDepth parameter can be increased to improve the saturation threshold.
+
+= !VciVgmn CABA  Implementation =
+
+The caba implementation is in 
+ * source:trunk/soclib/systemc/include/caba/interconnect/vci_vgmn.h
+ * source:trunk/soclib/systemc/src/caba/interconnect/vci_vgmn.cc
+
+== Template parameters ==
+{{{
+template<
+     typename vci_param,   //  VCI parameters
+     size_t NB_INITIAT,   // number of VCI initiators
+     size_t NB_TARGET,   // number of VCI targets
+     size_t MIN_LATENCY,   // minimal latency
+     size_t FIFO_DEPTH>   // network storage capacity
+}}}
+
+== Constructor parameters ==
+{{{
+VciVgmn(
+     sc_module_name name,   //  Component Name
+     const soclib::common::MappingTable &mt);   // MappingTable
+}}}
+
+== Ports ==
+
+ * sc_in<bool> '''p_resetn''' : Global system reset
+ * sc_in<bool> '''p_clk''' : Global system clock
+ * soclib::caba::!VciTarget<vci_param> '''p_from_initiator''' : Ports from VCI initiators
+ * soclib::caba::!VciInitiator<vci_param> '''p_to_target''' : Ports to VCI targets