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axi_xbar.sv
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axi_xbar.sv
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// Copyright (c) 2019 ETH Zurich and University of Bologna.
// Copyright and related rights are licensed under the Solderpad Hardware
// License, Version 0.51 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://solderpad.org/licenses/SHL-0.51. Unless required by applicable law
// or agreed to in writing, software, hardware and materials distributed under
// this License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
//
// Authors:
// - Wolfgang Roenninger <wroennin@iis.ee.ethz.ch>
// - Andreas Kurth <akurth@iis.ee.ethz.ch>
// - Florian Zaruba <zarubaf@iis.ee.ethz.ch>
// axi_xbar: Fully-connected AXI4+ATOP crossbar with an arbitrary number of slave and master ports.
// See `doc/axi_xbar.md` for the documentation, including the definition of parameters and ports.
module axi_xbar
import cf_math_pkg::idx_width;
#(
parameter axi_pkg::xbar_cfg_t Cfg = '0,
parameter bit ATOPs = 1'b1,
parameter bit [Cfg.NoSlvPorts-1:0][Cfg.NoMstPorts-1:0] Connectivity = '1,
parameter type slv_aw_chan_t = logic,
parameter type mst_aw_chan_t = logic,
parameter type w_chan_t = logic,
parameter type slv_b_chan_t = logic,
parameter type mst_b_chan_t = logic,
parameter type slv_ar_chan_t = logic,
parameter type mst_ar_chan_t = logic,
parameter type slv_r_chan_t = logic,
parameter type mst_r_chan_t = logic,
parameter type slv_req_t = logic,
parameter type slv_resp_t = logic,
parameter type mst_req_t = logic,
parameter type mst_resp_t = logic,
parameter type rule_t = axi_pkg::xbar_rule_64_t
`ifdef VCS
, localparam int unsigned MstPortsIdxWidth =
(Cfg.NoMstPorts == 32'd1) ? 32'd1 : unsigned'($clog2(Cfg.NoMstPorts))
`endif
) (
input logic clk_i,
input logic rst_ni,
input logic test_i,
input slv_req_t [Cfg.NoSlvPorts-1:0] slv_ports_req_i,
output slv_resp_t [Cfg.NoSlvPorts-1:0] slv_ports_resp_o,
output mst_req_t [Cfg.NoMstPorts-1:0] mst_ports_req_o,
input mst_resp_t [Cfg.NoMstPorts-1:0] mst_ports_resp_i,
input rule_t [Cfg.NoAddrRules-1:0] addr_map_i,
input logic [Cfg.NoSlvPorts-1:0] en_default_mst_port_i,
`ifdef VCS
input logic [Cfg.NoSlvPorts-1:0][MstPortsIdxWidth-1:0] default_mst_port_i
`else
input logic [Cfg.NoSlvPorts-1:0][idx_width(Cfg.NoMstPorts)-1:0] default_mst_port_i
`endif
);
typedef logic [Cfg.AxiAddrWidth-1:0] addr_t;
// to account for the decoding error slave
`ifdef VCS
localparam int unsigned MstPortsIdxWidthOne =
(Cfg.NoMstPorts == 32'd1) ? 32'd1 : unsigned'($clog2(Cfg.NoMstPorts + 1));
typedef logic [MstPortsIdxWidthOne-1:0] mst_port_idx_t;
`else
typedef logic [idx_width(Cfg.NoMstPorts + 1)-1:0] mst_port_idx_t;
`endif
// signals from the axi_demuxes, one index more for decode error
slv_req_t [Cfg.NoSlvPorts-1:0][Cfg.NoMstPorts:0] slv_reqs;
slv_resp_t [Cfg.NoSlvPorts-1:0][Cfg.NoMstPorts:0] slv_resps;
// workaround for issue #133 (problem with vsim 10.6c)
localparam int unsigned cfg_NoMstPorts = Cfg.NoMstPorts;
// signals into the axi_muxes, are of type slave as the multiplexer extends the ID
slv_req_t [Cfg.NoMstPorts-1:0][Cfg.NoSlvPorts-1:0] mst_reqs;
slv_resp_t [Cfg.NoMstPorts-1:0][Cfg.NoSlvPorts-1:0] mst_resps;
for (genvar i = 0; i < Cfg.NoSlvPorts; i++) begin : gen_slv_port_demux
`ifdef VCS
logic [MstPortsIdxWidth-1:0] dec_aw, dec_ar;
`else
logic [idx_width(Cfg.NoMstPorts)-1:0] dec_aw, dec_ar;
`endif
mst_port_idx_t slv_aw_select, slv_ar_select;
logic dec_aw_valid, dec_aw_error;
logic dec_ar_valid, dec_ar_error;
addr_decode #(
.NoIndices ( Cfg.NoMstPorts ),
.NoRules ( Cfg.NoAddrRules ),
.addr_t ( addr_t ),
.rule_t ( rule_t )
) i_axi_aw_decode (
.addr_i ( slv_ports_req_i[i].aw.addr ),
.addr_map_i ( addr_map_i ),
.idx_o ( dec_aw ),
.dec_valid_o ( dec_aw_valid ),
.dec_error_o ( dec_aw_error ),
.en_default_idx_i ( en_default_mst_port_i[i] ),
.default_idx_i ( default_mst_port_i[i] )
);
addr_decode #(
.NoIndices ( Cfg.NoMstPorts ),
.addr_t ( addr_t ),
.NoRules ( Cfg.NoAddrRules ),
.rule_t ( rule_t )
) i_axi_ar_decode (
.addr_i ( slv_ports_req_i[i].ar.addr ),
.addr_map_i ( addr_map_i ),
.idx_o ( dec_ar ),
.dec_valid_o ( dec_ar_valid ),
.dec_error_o ( dec_ar_error ),
.en_default_idx_i ( en_default_mst_port_i[i] ),
.default_idx_i ( default_mst_port_i[i] )
);
assign slv_aw_select = (dec_aw_error) ?
mst_port_idx_t'(Cfg.NoMstPorts) : mst_port_idx_t'(dec_aw);
assign slv_ar_select = (dec_ar_error) ?
mst_port_idx_t'(Cfg.NoMstPorts) : mst_port_idx_t'(dec_ar);
// make sure that the default slave does not get changed, if there is an unserved Ax
// pragma translate_off
`ifndef VERILATOR
`ifndef XSIM
default disable iff (~rst_ni);
default_aw_mst_port_en: assert property(
@(posedge clk_i) (slv_ports_req_i[i].aw_valid && !slv_ports_resp_o[i].aw_ready)
|=> $stable(en_default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the default mst port\
enable, when there is an unserved Aw beat. Slave Port: %0d", i));
default_aw_mst_port: assert property(
@(posedge clk_i) (slv_ports_req_i[i].aw_valid && !slv_ports_resp_o[i].aw_ready)
|=> $stable(default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the default mst port\
when there is an unserved Aw beat. Slave Port: %0d", i));
default_ar_mst_port_en: assert property(
@(posedge clk_i) (slv_ports_req_i[i].ar_valid && !slv_ports_resp_o[i].ar_ready)
|=> $stable(en_default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the enable, when\
there is an unserved Ar beat. Slave Port: %0d", i));
default_ar_mst_port: assert property(
@(posedge clk_i) (slv_ports_req_i[i].ar_valid && !slv_ports_resp_o[i].ar_ready)
|=> $stable(default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the default mst port\
when there is an unserved Ar beat. Slave Port: %0d", i));
`endif
`endif
// pragma translate_on
axi_demux #(
.AxiIdWidth ( Cfg.AxiIdWidthSlvPorts ), // ID Width
.AtopSupport ( ATOPs ),
.aw_chan_t ( slv_aw_chan_t ), // AW Channel Type
.w_chan_t ( w_chan_t ), // W Channel Type
.b_chan_t ( slv_b_chan_t ), // B Channel Type
.ar_chan_t ( slv_ar_chan_t ), // AR Channel Type
.r_chan_t ( slv_r_chan_t ), // R Channel Type
.axi_req_t ( slv_req_t ),
.axi_resp_t ( slv_resp_t ),
.NoMstPorts ( Cfg.NoMstPorts + 1 ),
.MaxTrans ( Cfg.MaxMstTrans ),
.AxiLookBits ( Cfg.AxiIdUsedSlvPorts ),
.UniqueIds ( Cfg.UniqueIds ),
.FallThrough ( Cfg.FallThrough ),
.SpillAw ( Cfg.LatencyMode[9] ),
.SpillW ( Cfg.LatencyMode[8] ),
.SpillB ( Cfg.LatencyMode[7] ),
.SpillAr ( Cfg.LatencyMode[6] ),
.SpillR ( Cfg.LatencyMode[5] )
) i_axi_demux (
.clk_i, // Clock
.rst_ni, // Asynchronous reset active low
.test_i, // Testmode enable
.slv_req_i ( slv_ports_req_i[i] ),
.slv_aw_select_i ( slv_aw_select ),
.slv_ar_select_i ( slv_ar_select ),
.slv_resp_o ( slv_ports_resp_o[i] ),
.mst_reqs_o ( slv_reqs[i] ),
.mst_resps_i ( slv_resps[i] )
);
axi_err_slv #(
.AxiIdWidth ( Cfg.AxiIdWidthSlvPorts ),
.axi_req_t ( slv_req_t ),
.axi_resp_t ( slv_resp_t ),
.Resp ( axi_pkg::RESP_DECERR ),
.ATOPs ( ATOPs ),
.MaxTrans ( 4 ) // Transactions terminate at this slave, so minimize
// resource consumption by accepting only a few
// transactions at a time.
) i_axi_err_slv (
.clk_i, // Clock
.rst_ni, // Asynchronous reset active low
.test_i, // Testmode enable
// slave port
.slv_req_i ( slv_reqs[i][Cfg.NoMstPorts] ),
.slv_resp_o ( slv_resps[i][cfg_NoMstPorts] )
);
end
// cross all channels
for (genvar i = 0; i < Cfg.NoSlvPorts; i++) begin : gen_xbar_slv_cross
for (genvar j = 0; j < Cfg.NoMstPorts; j++) begin : gen_xbar_mst_cross
if (Connectivity[i][j]) begin : gen_connection
assign mst_reqs[j][i] = slv_reqs[i][j];
assign slv_resps[i][j] = mst_resps[j][i];
end else begin : gen_no_connection
assign mst_reqs[j][i] = '0;
axi_err_slv #(
.AxiIdWidth ( Cfg.AxiIdWidthSlvPorts ),
.axi_req_t ( slv_req_t ),
.axi_resp_t ( slv_resp_t ),
.Resp ( axi_pkg::RESP_DECERR ),
.ATOPs ( ATOPs ),
.MaxTrans ( 1 )
) i_axi_err_slv (
.clk_i,
.rst_ni,
.test_i,
.slv_req_i ( slv_reqs[i][j] ),
.slv_resp_o ( slv_resps[i][j] )
);
end
end
end
for (genvar i = 0; i < Cfg.NoMstPorts; i++) begin : gen_mst_port_mux
axi_mux #(
.SlvAxiIDWidth ( Cfg.AxiIdWidthSlvPorts ), // ID width of the slave ports
.slv_aw_chan_t ( slv_aw_chan_t ), // AW Channel Type, slave ports
.mst_aw_chan_t ( mst_aw_chan_t ), // AW Channel Type, master port
.w_chan_t ( w_chan_t ), // W Channel Type, all ports
.slv_b_chan_t ( slv_b_chan_t ), // B Channel Type, slave ports
.mst_b_chan_t ( mst_b_chan_t ), // B Channel Type, master port
.slv_ar_chan_t ( slv_ar_chan_t ), // AR Channel Type, slave ports
.mst_ar_chan_t ( mst_ar_chan_t ), // AR Channel Type, master port
.slv_r_chan_t ( slv_r_chan_t ), // R Channel Type, slave ports
.mst_r_chan_t ( mst_r_chan_t ), // R Channel Type, master port
.slv_req_t ( slv_req_t ),
.slv_resp_t ( slv_resp_t ),
.mst_req_t ( mst_req_t ),
.mst_resp_t ( mst_resp_t ),
.NoSlvPorts ( Cfg.NoSlvPorts ), // Number of Masters for the module
.MaxWTrans ( Cfg.MaxSlvTrans ),
.FallThrough ( Cfg.FallThrough ),
.SpillAw ( Cfg.LatencyMode[4] ),
.SpillW ( Cfg.LatencyMode[3] ),
.SpillB ( Cfg.LatencyMode[2] ),
.SpillAr ( Cfg.LatencyMode[1] ),
.SpillR ( Cfg.LatencyMode[0] )
) i_axi_mux (
.clk_i, // Clock
.rst_ni, // Asynchronous reset active low
.test_i, // Test Mode enable
.slv_reqs_i ( mst_reqs[i] ),
.slv_resps_o ( mst_resps[i] ),
.mst_req_o ( mst_ports_req_o[i] ),
.mst_resp_i ( mst_ports_resp_i[i] )
);
end
// pragma translate_off
`ifndef VERILATOR
`ifndef XSIM
initial begin : check_params
id_slv_req_ports: assert ($bits(slv_ports_req_i[0].aw.id ) == Cfg.AxiIdWidthSlvPorts) else
$fatal(1, $sformatf("Slv_req and aw_chan id width not equal."));
id_slv_resp_ports: assert ($bits(slv_ports_resp_o[0].r.id) == Cfg.AxiIdWidthSlvPorts) else
$fatal(1, $sformatf("Slv_req and aw_chan id width not equal."));
end
`endif
`endif
// pragma translate_on
endmodule
`include "axi/assign.svh"
`include "axi/typedef.svh"
module axi_xbar_intf
import cf_math_pkg::idx_width;
#(
parameter int unsigned AXI_USER_WIDTH = 0,
parameter axi_pkg::xbar_cfg_t Cfg = '0,
parameter bit ATOPS = 1'b1,
parameter bit [Cfg.NoSlvPorts-1:0][Cfg.NoMstPorts-1:0] CONNECTIVITY = '1,
parameter type rule_t = axi_pkg::xbar_rule_64_t
`ifdef VCS
, localparam int unsigned MstPortsIdxWidth =
(Cfg.NoMstPorts == 32'd1) ? 32'd1 : unsigned'($clog2(Cfg.NoMstPorts))
`endif
) (
input logic clk_i,
input logic rst_ni,
input logic test_i,
AXI_BUS.Slave slv_ports [Cfg.NoSlvPorts-1:0],
AXI_BUS.Master mst_ports [Cfg.NoMstPorts-1:0],
input rule_t [Cfg.NoAddrRules-1:0] addr_map_i,
input logic [Cfg.NoSlvPorts-1:0] en_default_mst_port_i,
`ifdef VCS
input logic [Cfg.NoSlvPorts-1:0][MstPortsIdxWidth-1:0] default_mst_port_i
`else
input logic [Cfg.NoSlvPorts-1:0][idx_width(Cfg.NoMstPorts)-1:0] default_mst_port_i
`endif
);
localparam int unsigned AxiIdWidthMstPorts = Cfg.AxiIdWidthSlvPorts + $clog2(Cfg.NoSlvPorts);
typedef logic [AxiIdWidthMstPorts -1:0] id_mst_t;
typedef logic [Cfg.AxiIdWidthSlvPorts -1:0] id_slv_t;
typedef logic [Cfg.AxiAddrWidth -1:0] addr_t;
typedef logic [Cfg.AxiDataWidth -1:0] data_t;
typedef logic [Cfg.AxiDataWidth/8 -1:0] strb_t;
typedef logic [AXI_USER_WIDTH -1:0] user_t;
`AXI_TYPEDEF_AW_CHAN_T(mst_aw_chan_t, addr_t, id_mst_t, user_t)
`AXI_TYPEDEF_AW_CHAN_T(slv_aw_chan_t, addr_t, id_slv_t, user_t)
`AXI_TYPEDEF_W_CHAN_T(w_chan_t, data_t, strb_t, user_t)
`AXI_TYPEDEF_B_CHAN_T(mst_b_chan_t, id_mst_t, user_t)
`AXI_TYPEDEF_B_CHAN_T(slv_b_chan_t, id_slv_t, user_t)
`AXI_TYPEDEF_AR_CHAN_T(mst_ar_chan_t, addr_t, id_mst_t, user_t)
`AXI_TYPEDEF_AR_CHAN_T(slv_ar_chan_t, addr_t, id_slv_t, user_t)
`AXI_TYPEDEF_R_CHAN_T(mst_r_chan_t, data_t, id_mst_t, user_t)
`AXI_TYPEDEF_R_CHAN_T(slv_r_chan_t, data_t, id_slv_t, user_t)
`AXI_TYPEDEF_REQ_T(mst_req_t, mst_aw_chan_t, w_chan_t, mst_ar_chan_t)
`AXI_TYPEDEF_REQ_T(slv_req_t, slv_aw_chan_t, w_chan_t, slv_ar_chan_t)
`AXI_TYPEDEF_RESP_T(mst_resp_t, mst_b_chan_t, mst_r_chan_t)
`AXI_TYPEDEF_RESP_T(slv_resp_t, slv_b_chan_t, slv_r_chan_t)
mst_req_t [Cfg.NoMstPorts-1:0] mst_reqs;
mst_resp_t [Cfg.NoMstPorts-1:0] mst_resps;
slv_req_t [Cfg.NoSlvPorts-1:0] slv_reqs;
slv_resp_t [Cfg.NoSlvPorts-1:0] slv_resps;
for (genvar i = 0; i < Cfg.NoMstPorts; i++) begin : gen_assign_mst
`AXI_ASSIGN_FROM_REQ(mst_ports[i], mst_reqs[i])
`AXI_ASSIGN_TO_RESP(mst_resps[i], mst_ports[i])
end
for (genvar i = 0; i < Cfg.NoSlvPorts; i++) begin : gen_assign_slv
`AXI_ASSIGN_TO_REQ(slv_reqs[i], slv_ports[i])
`AXI_ASSIGN_FROM_RESP(slv_ports[i], slv_resps[i])
end
axi_xbar #(
.Cfg (Cfg),
.ATOPs ( ATOPS ),
.Connectivity ( CONNECTIVITY ),
.slv_aw_chan_t ( slv_aw_chan_t ),
.mst_aw_chan_t ( mst_aw_chan_t ),
.w_chan_t ( w_chan_t ),
.slv_b_chan_t ( slv_b_chan_t ),
.mst_b_chan_t ( mst_b_chan_t ),
.slv_ar_chan_t ( slv_ar_chan_t ),
.mst_ar_chan_t ( mst_ar_chan_t ),
.slv_r_chan_t ( slv_r_chan_t ),
.mst_r_chan_t ( mst_r_chan_t ),
.slv_req_t ( slv_req_t ),
.slv_resp_t ( slv_resp_t ),
.mst_req_t ( mst_req_t ),
.mst_resp_t ( mst_resp_t ),
.rule_t ( rule_t )
) i_xbar (
.clk_i,
.rst_ni,
.test_i,
.slv_ports_req_i (slv_reqs ),
.slv_ports_resp_o (slv_resps),
.mst_ports_req_o (mst_reqs ),
.mst_ports_resp_i (mst_resps),
.addr_map_i,
.en_default_mst_port_i,
.default_mst_port_i
);
endmodule