SocLib Components General Index

PibusBcu

1) Functional Description

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

The tree basic functionalities ot the BCU 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.

2) Component definition & usage

source:trunk/soclib/soclib/module/network_component/pibus_bcu/caba/metadata/pibus_bcu.sd​

Uses( 'pibus_bcu' )

3) CABA Implementation

CABA sources

• interface : source:trunk/soclib/soclib/module/network_component/pibus_bcu/caba/source/include/pibus_bcu.h​
• implementation : source:trunk/soclib/soclib/module/network_component/pibus_bcu/caba/source/src/pibus_bcu.cpp​

CABA 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)

CABA 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

4) TLM-T Implementation

There is no TLM-T implementation for this component.