[wiki:Component SocLib Components General Index] 

= !PibusBcu Functional Description =

This hardware component is a PIBUS controller. It can be used in conjunction with the '''!VciPiInitiatorWrapper''' and the '''!VciPiTargetWrapper''' to build a system using a PIBus interconnect.

The tree basic functionalities are :
 * arbitration between simultaneous initiator requests.
 * selection of the adressed target, by decoding the MSB address bits.
 * time-out, when the selected target does not complete the transaction.
The  main features are the following :
 * The default master mechanism is not supported.
 * The supported PIBUS response codes are  PI_ACK_RDY, PI_ACK_WAT, and PI_ACK_ERR.
 * The arbitration policy between initiators is round-robin.
 * This component uses the [wiki:Component/MappingTable mapping table] to build the ROM that decodes the address MSB bits and give  the target index used to activate the proper p_sel[i] signal.
 * The COUNT_REQ[i] register counts the total number of transactions for initiator i.
 * The COUNT_WAIT[i] register counts the total number of wait cycles for initiator i. 
 
= Component definition =

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

== Usage ==

!PibusBcu has no parameters
{{{
Uses( 'pibus_bcu' )
}}}

= !PibusBcu CABA  Implementation =

The caba implementation is in 
 * source:trunk/soclib/systemc/include/caba/interconnect/pibus_bcu.h
 * source:trunk/soclib/systemc/src/caba/interconnect/pibus_bcu.cc

== Template parameters ==

'''None''' 

== Constructor parameters ==
{{{
PiBcu( 
     sc_module_name name,   //  Instance Name
     const soclib::common::MappingTable &mp,   // Mapping Table
     size_t nb_master,   // Number of initiators
     size_t nb-slave,   // Number of targets
     uint32_t time_out);   // Time-out (number of cycles)
}}}

== Ports ==

 * sc_in<bool> '''p_resetn''' : Global system reset
 * sc_in<bool> '''p_clk''' : Global system clock
 * sc_out<bool> '''*p_gnt''' : Pointer to the grant ports array 
 * sc_in<bool> '''*p_req''' : Pointer to the request ports array
 * sc_out<bool> '''*p_sel''' : Pointer to the select ports array
 * sc_in<sc_uint<32> > '''p_a''' : Pibus address
 * sc_in<bool> '''lock''' : Pibus lock (used for bursts)
 * sc_in<sc_uint<2> > '''p_ack''' : Pibus response code
 * sc_out<bool> '''p_tout''' : Pibus Time-out