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//
// Copyright 2011 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// wb_bus_writer
//
// WB Bus Master device to send a sequence of single-word transactions
// based on a list in a RAM or ROM (FASM interface)
// ROM data format is {WB_ADDR[15:0],WB_DATA[31:0]}
// continues until it gets an all-1s entry
module wb_bus_writer (input start,
output done,
output reg [15:0] rom_addr,
input [47:0] rom_data,
// WB Master Interface, don't need wb_dat_i
input wb_clk_i,
input wb_rst_i,
output [31:0] wb_dat_o,
input wb_ack_i,
output [15:0] wb_adr_o,
output wb_cyc_o,
output [3:0] wb_sel_o,
output wb_stb_o,
output wb_we_o
);
`define IDLE 0
`define READ 1
reg [3:0] state;
assign done = (state != `IDLE) && (&rom_data); // Done when we see all 1s
always @(posedge wb_clk_i)
if(wb_rst_i)
begin
rom_addr <= #1 0;
state <= #1 0;
end
else if(start)
begin
rom_addr <= #1 0;
state <= #1 `READ;
end
else if((state == `READ) && wb_ack_i)
if(done)
state <= #1 `IDLE;
else
rom_addr <= #1 rom_addr + 1;
assign wb_dat_o = rom_data[31:0];
assign wb_adr_o = rom_data[47:32];
assign wb_sel_o = 4'b1111; // All writes are the full 32 bits
assign wb_cyc_o = !done & (state != `IDLE);
assign wb_stb_o = !done & (state != `IDLE);
assign wb_we_o = !done & (state != `IDLE);
endmodule // wb_bus_writer
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