Avalon2APB Bridge Core: The bridge core performs the main functionality of translating Avalon transactions into APB transactions.It converts Avalon bus signals into APB signals such as PADDR, PWRITE, PWDATA, PSEL, and PENABLE. The core manages the two-phase APB transfer sequence, which includes the setup phase and enable phase required for APB communication.It contains control logic or a state machine that sequences read and write operations correctly according to APB protocol timing.During read operations, it collects PRDATA from APB peripherals and converts the response back into Avalon format.The bridge may also include buffering and synchronization logic to handle timing differences between the Avalon and APB buses.Thus, the bridge core functions as the protocol translator and transaction controller between the two bus standards.
Avalon Slave Interface: The Avalon Slave Interface is the input side of the bridge that connects to an Avalon-based master such as a processor, DMA controller, or other system component.It receives read and write transactions, address signals, control signals, and write data from the Avalon master.The interface interprets Avalon protocol signals such as address, read/write commands, byte enables, and waitrequest signals.It captures the incoming transaction and forwards the necessary information to the bridge core for processing.Handshake mechanisms ensure that the Avalon master is informed whether the bridge is ready to acceptnew requests.In essence, this interface acts as the communication entry point for Avalon bus transactions that need to access APB peripherals.
APB Master Interface: The APB Master Interface is the output side of the bridge that communicates with APB peripherals.The bridge behaves as an APB master, initiating transactions on the APB bus.It sends address, control, and data signals to APB peripherals such as timers, UARTs, GPIO modules, or watchdog timers.The interface generates PSEL signals to select the appropriate peripheral based on address decoding.During read operations, the APB peripheral returns PRDATA, which is sent back through the bridge core to the Avalon side.This interface allows Avalon-based systems to control and access low-speed peripherals connected through the APB bus.
