SocLib Components General Index

VciSimpleCrossbar Functional Description

This hardware component is a generic VCI crossbar, it contains two independant crossbars for VCI commands and VCI responses.

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).

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 mapping table. It uses the VCI RSRCID field to route the response packet to the initiator.

Component definition

Available in source:trunk/soclib/desc/soclib/vci_simple_crossbar.sd

Usage

VciSimpleCrossbar has no other parameter than VCI ones, it may be used like others, see SoclibCc/VciParameters

Uses( 'vci_simple_crossbar', **vci_parameters )

VciSimpleCrossbar CABA Implementation

The caba implementation is in

• source:trunk/soclib/systemc/include/caba/interconnect/vci_simple_crossbar.h
• source:trunk/soclib/systemc/src/caba/interconnect/vci_simple_crossbar.cc

Template parameters

template<typename vci_param>

Constructor parameters

VciSimpleCrossbar(
     sc_module_name name,
     const soclib::common::MappingTable &mt,
     size_t nb_initiator,
     size_t nb_target );

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