// (C) 2001-2013 Altera Corporation. All rights reserved.
// Your use of Altera Corporation's design tools, logic functions and other
// software and tools, and its AMPP partner logic functions, and any output
// files any of the foregoing (including device programming or simulation
// files), and any associated documentation or information are expressly subject
// to the terms and conditions of the Altera Program License Subscription
// Agreement, Altera MegaCore Function License Agreement, or other applicable
// license agreement, including, without limitation, that your use is for the
// sole purpose of programming logic devices manufactured by Altera and sold by
// Altera or its authorized distributors. Please refer to the applicable
// agreement for further details.
// (C) 2001-2013 Altera Corporation. All rights reserved.
// Your use of Altera Corporation's design tools, logic functions and other
// software and tools, and its AMPP partner logic functions, and any output
// files any of the foregoing (including device programming or simulation
// files), and any associated documentation or information are expressly subject
// to the terms and conditions of the Altera Program License Subscription
// Agreement, Altera MegaCore Function License Agreement, or other applicable
// license agreement, including, without limitation, that your use is for the
// sole purpose of programming logic devices manufactured by Altera and sold by
// Altera or its authorized distributors. Please refer to the applicable
// agreement for further details.
// $Id: //acds/rel/13.0sp1/ip/merlin/altera_merlin_router/altera_merlin_router.sv.terp#1 $
// $Revision: #1 $
// $Date: 2013/03/07 $
// $Author: swbranch $
// -------------------------------------------------------
// Merlin Router
//
// Asserts the appropriate one-hot encoded channel based on
// either (a) the address or (b) the dest id. The DECODER_TYPE
// parameter controls this behaviour. 0 means address decoder,
// 1 means dest id decoder.
//
// In the case of (a), it also sets the destination id.
// -------------------------------------------------------
`timescale 1 ns / 1 ns
module nios_system_addr_router_001_default_decode
#(
parameter DEFAULT_CHANNEL = 1,
DEFAULT_WR_CHANNEL = -1,
DEFAULT_RD_CHANNEL = -1,
DEFAULT_DESTID = 15
)
(output [85 - 81 : 0] default_destination_id,
output [18-1 : 0] default_wr_channel,
output [18-1 : 0] default_rd_channel,
output [18-1 : 0] default_src_channel
);
assign default_destination_id =
DEFAULT_DESTID[85 - 81 : 0];
generate begin : default_decode
if (DEFAULT_CHANNEL == -1) begin
assign default_src_channel = '0;
end
else begin
assign default_src_channel = 18'b1 << DEFAULT_CHANNEL;
end
end
endgenerate
generate begin : default_decode_rw
if (DEFAULT_RD_CHANNEL == -1) begin
assign default_wr_channel = '0;
assign default_rd_channel = '0;
end
else begin
assign default_wr_channel = 18'b1 << DEFAULT_WR_CHANNEL;
assign default_rd_channel = 18'b1 << DEFAULT_RD_CHANNEL;
end
end
endgenerate
endmodule
module nios_system_addr_router_001
(
// -------------------
// Clock & Reset
// -------------------
input clk,
input reset,
// -------------------
// Command Sink (Input)
// -------------------
input sink_valid,
input [96-1 : 0] sink_data,
input sink_startofpacket,
input sink_endofpacket,
output sink_ready,
// -------------------
// Command Source (Output)
// -------------------
output src_valid,
output reg [96-1 : 0] src_data,
output reg [18-1 : 0] src_channel,
output src_startofpacket,
output src_endofpacket,
input src_ready
);
// -------------------------------------------------------
// Local parameters and variables
// -------------------------------------------------------
localparam PKT_ADDR_H = 54;
localparam PKT_ADDR_L = 36;
localparam PKT_DEST_ID_H = 85;
localparam PKT_DEST_ID_L = 81;
localparam PKT_PROTECTION_H = 89;
localparam PKT_PROTECTION_L = 87;
localparam ST_DATA_W = 96;
localparam ST_CHANNEL_W = 18;
localparam DECODER_TYPE = 0;
localparam PKT_TRANS_WRITE = 57;
localparam PKT_TRANS_READ = 58;
localparam PKT_ADDR_W = PKT_ADDR_H-PKT_ADDR_L + 1;
localparam PKT_DEST_ID_W = PKT_DEST_ID_H-PKT_DEST_ID_L + 1;
// -------------------------------------------------------
// Figure out the number of bits to mask off for each slave span
// during address decoding
// -------------------------------------------------------
localparam PAD0 = log2ceil(64'h40000 - 64'h0);
localparam PAD1 = log2ceil(64'h41000 - 64'h40800);
localparam PAD2 = log2ceil(64'h41020 - 64'h41010);
localparam PAD3 = log2ceil(64'h41030 - 64'h41020);
localparam PAD4 = log2ceil(64'h41040 - 64'h41030);
localparam PAD5 = log2ceil(64'h41050 - 64'h41040);
localparam PAD6 = log2ceil(64'h41060 - 64'h41050);
localparam PAD7 = log2ceil(64'h41070 - 64'h41060);
localparam PAD8 = log2ceil(64'h41080 - 64'h41070);
localparam PAD9 = log2ceil(64'h41090 - 64'h41080);
localparam PAD10 = log2ceil(64'h410a0 - 64'h41090);
localparam PAD11 = log2ceil(64'h410b0 - 64'h410a0);
localparam PAD12 = log2ceil(64'h410c0 - 64'h410b0);
localparam PAD13 = log2ceil(64'h410d0 - 64'h410c0);
localparam PAD14 = log2ceil(64'h410e0 - 64'h410d0);
localparam PAD15 = log2ceil(64'h410f0 - 64'h410e0);
localparam PAD16 = log2ceil(64'h41100 - 64'h410f0);
localparam PAD17 = log2ceil(64'h41108 - 64'h41100);
// -------------------------------------------------------
// Work out which address bits are significant based on the
// address range of the slaves. If the required width is too
// large or too small, we use the address field width instead.
// -------------------------------------------------------
localparam ADDR_RANGE = 64'h41108;
localparam RANGE_ADDR_WIDTH = log2ceil(ADDR_RANGE);
localparam OPTIMIZED_ADDR_H = (RANGE_ADDR_WIDTH > PKT_ADDR_W) ||
(RANGE_ADDR_WIDTH == 0) ?
PKT_ADDR_H :
PKT_ADDR_L + RANGE_ADDR_WIDTH - 1;
localparam RG = RANGE_ADDR_WIDTH-1;
wire [PKT_ADDR_W-1 : 0] address = sink_data[OPTIMIZED_ADDR_H : PKT_ADDR_L];
// -------------------------------------------------------
// Pass almost everything through, untouched
// -------------------------------------------------------
assign sink_ready = src_ready;
assign src_valid = sink_valid;
assign src_startofpacket = sink_startofpacket;
assign src_endofpacket = sink_endofpacket;
wire [PKT_DEST_ID_W-1:0] default_destid;
wire [18-1 : 0] default_src_channel;
nios_system_addr_router_001_default_decode the_default_decode(
.default_destination_id (default_destid),
.default_wr_channel (),
.default_rd_channel (),
.default_src_channel (default_src_channel)
);
always @* begin
src_data = sink_data;
src_channel = default_src_channel;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = default_destid;
// --------------------------------------------------
// Address Decoder
// Sets the channel and destination ID based on the address
// --------------------------------------------------
// ( 0x0 .. 0x40000 )
if ( {address[RG:PAD0],{PAD0{1'b0}}} == 19'h0 ) begin
src_channel = 18'b000000000000000010;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 15;
end
// ( 0x40800 .. 0x41000 )
if ( {address[RG:PAD1],{PAD1{1'b0}}} == 19'h40800 ) begin
src_channel = 18'b000000000000000001;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 14;
end
// ( 0x41010 .. 0x41020 )
if ( {address[RG:PAD2],{PAD2{1'b0}}} == 19'h41010 ) begin
src_channel = 18'b010000000000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 13;
end
// ( 0x41020 .. 0x41030 )
if ( {address[RG:PAD3],{PAD3{1'b0}}} == 19'h41020 ) begin
src_channel = 18'b100000000000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 12;
end
// ( 0x41030 .. 0x41040 )
if ( {address[RG:PAD4],{PAD4{1'b0}}} == 19'h41030 ) begin
src_channel = 18'b001000000000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 11;
end
// ( 0x41040 .. 0x41050 )
if ( {address[RG:PAD5],{PAD5{1'b0}}} == 19'h41040 ) begin
src_channel = 18'b000100000000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 9;
end
// ( 0x41050 .. 0x41060 )
if ( {address[RG:PAD6],{PAD6{1'b0}}} == 19'h41050 ) begin
src_channel = 18'b000010000000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 8;
end
// ( 0x41060 .. 0x41070 )
if ( {address[RG:PAD7],{PAD7{1'b0}}} == 19'h41060 ) begin
src_channel = 18'b000001000000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 7;
end
// ( 0x41070 .. 0x41080 )
if ( {address[RG:PAD8],{PAD8{1'b0}}} == 19'h41070 ) begin
src_channel = 18'b000000100000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 6;
end
// ( 0x41080 .. 0x41090 )
if ( {address[RG:PAD9],{PAD9{1'b0}}} == 19'h41080 ) begin
src_channel = 18'b000000010000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 5;
end
// ( 0x41090 .. 0x410a0 )
if ( {address[RG:PAD10],{PAD10{1'b0}}} == 19'h41090 ) begin
src_channel = 18'b000000001000000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 4;
end
// ( 0x410a0 .. 0x410b0 )
if ( {address[RG:PAD11],{PAD11{1'b0}}} == 19'h410a0 ) begin
src_channel = 18'b000000000100000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 3;
end
// ( 0x410b0 .. 0x410c0 )
if ( {address[RG:PAD12],{PAD12{1'b0}}} == 19'h410b0 ) begin
src_channel = 18'b000000000010000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 2;
end
// ( 0x410c0 .. 0x410d0 )
if ( {address[RG:PAD13],{PAD13{1'b0}}} == 19'h410c0 ) begin
src_channel = 18'b000000000001000000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 16;
end
// ( 0x410d0 .. 0x410e0 )
if ( {address[RG:PAD14],{PAD14{1'b0}}} == 19'h410d0 ) begin
src_channel = 18'b000000000000100000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 17;
end
// ( 0x410e0 .. 0x410f0 )
if ( {address[RG:PAD15],{PAD15{1'b0}}} == 19'h410e0 ) begin
src_channel = 18'b000000000000010000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 0;
end
// ( 0x410f0 .. 0x41100 )
if ( {address[RG:PAD16],{PAD16{1'b0}}} == 19'h410f0 ) begin
src_channel = 18'b000000000000000100;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 1;
end
// ( 0x41100 .. 0x41108 )
if ( {address[RG:PAD17],{PAD17{1'b0}}} == 19'h41100 ) begin
src_channel = 18'b000000000000001000;
src_data[PKT_DEST_ID_H:PKT_DEST_ID_L] = 10;
end
end
// --------------------------------------------------
// Ceil(log2()) function
// --------------------------------------------------
function integer log2ceil;
input reg[65:0] val;
reg [65:0] i;
begin
i = 1;
log2ceil = 0;
while (i < val) begin
log2ceil = log2ceil + 1;
i = i << 1;
end
end
endfunction
endmodule
