An n-way arbiter that connects multiple AXI manager ports to a single AXI subordinate port. More...

#include <AxiArbiter.h>

Inheritance diagram for AxiArbiter< axiCfg, numManagers, maxOutstandingRequests >:

Public Types
typedef axi::axi4< axiCfg >	axi_

typedef axi_::read::template subordinate ::ARPort	axi_rd_subordinate_ar

typedef axi_::read::template subordinate ::RPort	axi_rd_subordinate_r

typedef axi_::write::template subordinate ::AWPort	axi_wr_subordinate_aw

typedef axi_::write::template subordinate ::WPort	axi_wr_subordinate_w

typedef axi_::write::template subordinate ::BPort	axi_wr_subordinate_b

Public Member Functions
typedef	NVUINTW (numManagers_width) inFlight_t

	SC_HAS_PROCESS (AxiArbiter)

	AxiArbiter (sc_module_name name)

void	run_ar ()

void	run_r ()

void	run_aw ()

void	run_w ()

void	run_b ()

Public Attributes
sc_in< bool >	clk

sc_in< bool >	reset_bar

nvhls::nv_array< axi_rd_subordinate_ar, numManagers >	axi_rd_m_ar

nvhls::nv_array< axi_rd_subordinate_r, numManagers >	axi_rd_m_r

nvhls::nv_array< axi_wr_subordinate_aw, numManagers >	axi_wr_m_aw

nvhls::nv_array< axi_wr_subordinate_w, numManagers >	axi_wr_m_w

nvhls::nv_array< axi_wr_subordinate_b, numManagers >	axi_wr_m_b

axi_::read::template manager	axi_rd_s

axi_::write::template manager	axi_wr_s

FIFO< inFlight_t, maxOutstandingRequests >	readQ

Connections::Combinational< inFlight_t >	read_in_flight

FIFO< inFlight_t, maxOutstandingRequests >	writeQ

Connections::Combinational< inFlight_t >	write_in_flight

Connections::Combinational< inFlight_t >	active_write_manager

Connections::Combinational< NVUINT1 >	w_last

Static Public Attributes
static const int	kDebugLevel = 5

static const int	numManagers_width = nvhls::log2_ceil<numManagers>::val

Detailed Description

template<typename axiCfg, int numManagers, int maxOutstandingRequests>
class AxiArbiter< axiCfg, numManagers, maxOutstandingRequests >

An n-way arbiter that connects multiple AXI manager ports to a single AXI subordinate port.

Template Parameters

axiCfg	A valid AXI config.
numManagers	The number of managers to arbitrate between.
maxOutstandingRequests	The number of oustanding read or write requests that can be tracked with internal state.

Overview

AxiArbiter connects one or more AXI managers to a single AXI subordinate. In the case of contention, a round-robin Arbiter selects the next request to pass through.

The arbiter assumes that responses are returned in the order that requests are sent. Downstream request reordering is currently not supported.
The AXI configs of all ports must be the same.

Usage Guidelines

This module sets the stall mode to flush by default to mitigate possible RTL bugs that can occur in the default stall mode. If you are confident that this class of bugs will not occur in your use case, you can change the stall mode via TCL directive:

directive set /path/to/AxiArbiter/run_ar/while -PIPELINE_STALL_MODE stall

AxiArbiter

An n-way arbiter that connects multiple AXI manager ports to a single AXI subordinate port.

Definition AxiArbiter.h:58

This may reduce area/power.

Definition at line 58 of file AxiArbiter.h.