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 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