Livt.Net

src/drivers/ethernetlite/EthernetLiteBus.lvt

namespace Livt.Net.Drivers.EthernetLite

/**
 * Adapts the board's AXI signal interface to the shared word transaction core.
 * Signal publication is combinational; scheduled Read/Write calls delegate to
 * the same core exercised by the pin-level Livt device fixture.
 */
component EthernetLiteBus : IEthernetLiteRegisterAccess
{
	// Private live signal bridge; no protocol or frame storage lives here.
	axi: IAxi4LiteEthernetLiteMaster
	transactions: EthernetLiteTransactions

	/**
	 * Binds the external bus and creates the single-owner transaction sequencer.
	 */
	new(axi: IAxi4LiteEthernetLiteMaster)
	{
		this.axi = axi
		this.transactions = new EthernetLiteTransactions()
	}

	/**
	 * Reads one device word, returning false for non-OKAY responses.
	 */
	override fn Read(address: logic[13], value: out logic[32]) bool
	{
		var word: logic[32] = 0x00000000
		var success = this.transactions.Read(address, word)
		value = word
		return success
	}

	/**
	 * Writes one device word, completing only after its B response.
	 */
	override fn Write(address: logic[13], value: logic[32]) bool
	{
		return this.transactions.Write(address, value)
	}

	/**
	 * Bridges interface pins without scheduled accessors.
	 */
	process AxiPorts[]()
	{
		this.transactions.awready = this.axi.m_axi_awready
		this.axi.m_axi_awaddr = this.transactions.awaddr
		this.axi.m_axi_awvalid = this.transactions.awvalid
		this.transactions.wready = this.axi.m_axi_wready
		this.axi.m_axi_wdata = this.transactions.wdata
		this.axi.m_axi_wstrb = this.transactions.wstrb
		this.axi.m_axi_wvalid = this.transactions.wvalid
		this.transactions.bresp = this.axi.m_axi_bresp
		this.transactions.bvalid = this.axi.m_axi_bvalid
		this.axi.m_axi_bready = this.transactions.bready
		this.transactions.arready = this.axi.m_axi_arready
		this.axi.m_axi_araddr = this.transactions.araddr
		this.axi.m_axi_arvalid = this.transactions.arvalid
		this.transactions.rdata = this.axi.m_axi_rdata
		this.transactions.rresp = this.axi.m_axi_rresp
		this.transactions.rvalid = this.axi.m_axi_rvalid
		this.axi.m_axi_rready = this.transactions.rready
	}
}