311 lines
10 KiB
Systemverilog
311 lines
10 KiB
Systemverilog
|
// (C) 2001-2015 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/15.1/ip/merlin/altera_merlin_burst_adapter/new_source/altera_incr_burst_converter.sv#1 $
|
||
|
|
// $Revision: #1 $
|
||
|
|
// $Date: 2015/08/09 $
|
||
|
|
// $Author: swbranch $
|
||
|
|
|
||
|
|
// ----------------------------------------------------------
|
||
|
|
// This component is used for INCR Avalon slave
|
||
|
|
// (slave which only supports INCR) or AXI slave.
|
||
|
|
// It converts burst length of input packet
|
||
|
|
// to match slave burst.
|
||
|
|
// ----------------------------------------------------------
|
||
|
|
|
||
|
|
`timescale 1 ns / 1 ns
|
||
|
|
|
||
|
|
module altera_incr_burst_converter
|
||
|
|
#(
|
||
|
|
parameter
|
||
|
|
// ----------------------------------------
|
||
|
|
// Burst length Parameters
|
||
|
|
// (real burst length value, not bytecount)
|
||
|
|
// ----------------------------------------
|
||
|
|
MAX_IN_LEN = 16,
|
||
|
|
MAX_OUT_LEN = 4,
|
||
|
|
NUM_SYMBOLS = 4,
|
||
|
|
ADDR_WIDTH = 12,
|
||
|
|
BNDRY_WIDTH = 12,
|
||
|
|
BURSTSIZE_WIDTH = 3,
|
||
|
|
IN_NARROW_SIZE = 0,
|
||
|
|
PURELY_INCR_AVL_SYS = 0,
|
||
|
|
// ------------------
|
||
|
|
// Derived Parameters
|
||
|
|
// ------------------
|
||
|
|
LEN_WIDTH = log2ceil(MAX_IN_LEN) + 1,
|
||
|
|
OUT_LEN_WIDTH = log2ceil(MAX_OUT_LEN) + 1,
|
||
|
|
LOG2_NUMSYMBOLS = log2ceil(NUM_SYMBOLS)
|
||
|
|
)
|
||
|
|
(
|
||
|
|
input clk,
|
||
|
|
input reset,
|
||
|
|
input enable,
|
||
|
|
|
||
|
|
input is_write,
|
||
|
|
input [LEN_WIDTH - 1 : 0] in_len,
|
||
|
|
input in_sop,
|
||
|
|
|
||
|
|
input [ADDR_WIDTH - 1 : 0] in_addr,
|
||
|
|
input [ADDR_WIDTH - 1 : 0] in_addr_reg,
|
||
|
|
input [BNDRY_WIDTH - 1 : 0] in_burstwrap_reg,
|
||
|
|
input [BURSTSIZE_WIDTH - 1 : 0] in_size_t,
|
||
|
|
input [BURSTSIZE_WIDTH - 1 : 0] in_size_reg,
|
||
|
|
|
||
|
|
// converted output length
|
||
|
|
// out_len : compressed burst, read
|
||
|
|
// uncompressed_len: uncompressed, write
|
||
|
|
output reg [LEN_WIDTH - 1 : 0] out_len,
|
||
|
|
output reg [LEN_WIDTH - 1 : 0] uncompr_out_len,
|
||
|
|
// Compressed address output
|
||
|
|
output reg [ADDR_WIDTH - 1 : 0] out_addr,
|
||
|
|
output reg new_burst_export
|
||
|
|
);
|
||
|
|
|
||
|
|
// ----------------------------------------
|
||
|
|
// Signals for wrapping support
|
||
|
|
// ----------------------------------------
|
||
|
|
reg [LEN_WIDTH - 1 : 0] remaining_len;
|
||
|
|
reg [LEN_WIDTH - 1 : 0] next_out_len;
|
||
|
|
reg [LEN_WIDTH - 1 : 0] next_rem_len;
|
||
|
|
reg [LEN_WIDTH - 1 : 0] uncompr_remaining_len;
|
||
|
|
reg [LEN_WIDTH - 1 : 0] next_uncompr_remaining_len;
|
||
|
|
reg [LEN_WIDTH - 1 : 0] next_uncompr_rem_len;
|
||
|
|
reg new_burst;
|
||
|
|
reg uncompr_sub_burst;
|
||
|
|
|
||
|
|
// Avoid QIS warning
|
||
|
|
wire [OUT_LEN_WIDTH - 1 : 0] max_out_length;
|
||
|
|
assign max_out_length = MAX_OUT_LEN[OUT_LEN_WIDTH - 1 : 0];
|
||
|
|
|
||
|
|
always_comb begin
|
||
|
|
new_burst_export = new_burst;
|
||
|
|
end
|
||
|
|
|
||
|
|
// -------------------------------------------
|
||
|
|
// length remaining calculation
|
||
|
|
// -------------------------------------------
|
||
|
|
|
||
|
|
always_comb begin : proc_uncompressed_remaining_len
|
||
|
|
if ((in_len <= max_out_length) && is_write) begin
|
||
|
|
uncompr_remaining_len = in_len;
|
||
|
|
end else begin
|
||
|
|
uncompr_remaining_len = max_out_length;
|
||
|
|
end
|
||
|
|
|
||
|
|
if (uncompr_sub_burst)
|
||
|
|
uncompr_remaining_len = next_uncompr_rem_len;
|
||
|
|
end
|
||
|
|
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
next_uncompr_rem_len <= 0;
|
||
|
|
end
|
||
|
|
else if (enable) begin
|
||
|
|
next_uncompr_rem_len <= uncompr_remaining_len - 1'b1; // in term of length, it just reduces 1
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
always_comb begin : proc_compressed_remaining_len
|
||
|
|
remaining_len = in_len;
|
||
|
|
if (!new_burst)
|
||
|
|
remaining_len = next_rem_len;
|
||
|
|
end
|
||
|
|
|
||
|
|
always_ff@(posedge clk or posedge reset) begin : proc_next_uncompressed_remaining_len
|
||
|
|
if(reset) begin
|
||
|
|
next_uncompr_remaining_len <= '0;
|
||
|
|
end
|
||
|
|
else if (enable) begin
|
||
|
|
if (in_sop) begin
|
||
|
|
next_uncompr_remaining_len <= in_len - max_out_length;
|
||
|
|
end
|
||
|
|
else if (!uncompr_sub_burst)
|
||
|
|
next_uncompr_remaining_len <= next_uncompr_remaining_len - max_out_length;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
always_comb begin
|
||
|
|
next_out_len = max_out_length;
|
||
|
|
if (remaining_len < max_out_length) begin
|
||
|
|
next_out_len = remaining_len;
|
||
|
|
end
|
||
|
|
end // always_comb
|
||
|
|
|
||
|
|
// --------------------------------------------------
|
||
|
|
// Length remaining calculation : compressed
|
||
|
|
// --------------------------------------------------
|
||
|
|
// length remaining for compressed transaction
|
||
|
|
// for wrap, need special handling for first out length
|
||
|
|
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset)
|
||
|
|
next_rem_len <= 0;
|
||
|
|
else if (enable) begin
|
||
|
|
if (new_burst)
|
||
|
|
next_rem_len <= in_len - max_out_length;
|
||
|
|
else
|
||
|
|
next_rem_len <= next_rem_len - max_out_length;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
uncompr_sub_burst <= 0;
|
||
|
|
end
|
||
|
|
else if (enable && is_write) begin
|
||
|
|
uncompr_sub_burst <= (uncompr_remaining_len > 1'b1);
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
// --------------------------------------------------
|
||
|
|
// Control signals
|
||
|
|
// --------------------------------------------------
|
||
|
|
wire end_compressed_sub_burst;
|
||
|
|
assign end_compressed_sub_burst = (remaining_len == next_out_len);
|
||
|
|
|
||
|
|
// new_burst:
|
||
|
|
// the converter takes in_len for new calculation
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset)
|
||
|
|
new_burst <= 1;
|
||
|
|
else if (enable)
|
||
|
|
new_burst <= end_compressed_sub_burst;
|
||
|
|
end
|
||
|
|
|
||
|
|
// --------------------------------------------------
|
||
|
|
// Output length
|
||
|
|
// --------------------------------------------------
|
||
|
|
// register out_len for compressed trans
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
out_len <= 0;
|
||
|
|
end
|
||
|
|
else if (enable) begin
|
||
|
|
out_len <= next_out_len;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
// register uncompr_out_len for uncompressed trans
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
uncompr_out_len <= '0;
|
||
|
|
end
|
||
|
|
else if (enable) begin
|
||
|
|
uncompr_out_len <= uncompr_remaining_len;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
// --------------------------------------------------
|
||
|
|
// Address Calculation
|
||
|
|
// --------------------------------------------------
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] addr_incr_sel;
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] addr_incr_sel_reg;
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] addr_incr_full_size;
|
||
|
|
|
||
|
|
localparam [ADDR_WIDTH - 1 : 0] ADDR_INCR = MAX_OUT_LEN << LOG2_NUMSYMBOLS;
|
||
|
|
|
||
|
|
generate
|
||
|
|
if (IN_NARROW_SIZE) begin : narrow_addr_incr
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] addr_incr_variable_size;
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] addr_incr_variable_size_reg;
|
||
|
|
|
||
|
|
assign addr_incr_variable_size = MAX_OUT_LEN << in_size_t;
|
||
|
|
assign addr_incr_variable_size_reg = MAX_OUT_LEN << in_size_reg;
|
||
|
|
|
||
|
|
assign addr_incr_sel = addr_incr_variable_size;
|
||
|
|
assign addr_incr_sel_reg = addr_incr_variable_size_reg;
|
||
|
|
end
|
||
|
|
else begin : full_addr_incr
|
||
|
|
assign addr_incr_full_size = ADDR_INCR[ADDR_WIDTH - 1 : 0];
|
||
|
|
assign addr_incr_sel = addr_incr_full_size;
|
||
|
|
assign addr_incr_sel_reg = addr_incr_full_size;
|
||
|
|
end
|
||
|
|
endgenerate
|
||
|
|
|
||
|
|
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] next_out_addr;
|
||
|
|
reg [ADDR_WIDTH - 1 : 0] incremented_addr;
|
||
|
|
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
out_addr <= '0;
|
||
|
|
end else begin
|
||
|
|
if (enable) begin
|
||
|
|
out_addr <= (next_out_addr);
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
generate
|
||
|
|
if (!PURELY_INCR_AVL_SYS) begin : incremented_addr_normal
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
incremented_addr <= '0;
|
||
|
|
end
|
||
|
|
else if (enable) begin
|
||
|
|
incremented_addr <= (next_out_addr + addr_incr_sel_reg);
|
||
|
|
if (new_burst) begin
|
||
|
|
incremented_addr <= (next_out_addr + addr_incr_sel);
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end // always_ff @
|
||
|
|
|
||
|
|
always_comb begin
|
||
|
|
next_out_addr = in_addr;
|
||
|
|
if (!new_burst) begin
|
||
|
|
next_out_addr = incremented_addr;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
else begin : incremented_addr_pure_av
|
||
|
|
always_ff @(posedge clk, posedge reset) begin
|
||
|
|
if (reset) begin
|
||
|
|
incremented_addr <= '0;
|
||
|
|
end
|
||
|
|
else if (enable) begin
|
||
|
|
incremented_addr <= (next_out_addr + addr_incr_sel_reg);
|
||
|
|
end
|
||
|
|
end // always_ff @
|
||
|
|
|
||
|
|
always_comb begin
|
||
|
|
next_out_addr = in_addr;
|
||
|
|
if (!new_burst) begin
|
||
|
|
next_out_addr = (incremented_addr);
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
end
|
||
|
|
endgenerate
|
||
|
|
|
||
|
|
// --------------------------------------------------
|
||
|
|
// Calculates the log2ceil of the input value
|
||
|
|
// --------------------------------------------------
|
||
|
|
function integer log2ceil;
|
||
|
|
input integer val;
|
||
|
|
reg[31:0] i;
|
||
|
|
|
||
|
|
begin
|
||
|
|
i = 1;
|
||
|
|
log2ceil = 0;
|
||
|
|
|
||
|
|
while (i < val) begin
|
||
|
|
log2ceil = log2ceil + 1;
|
||
|
|
i = i[30:0] << 1;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
endfunction
|
||
|
|
|
||
|
|
endmodule
|