// ================================================================
// NVDLA Open Source Project
//
// Copyright(c) 2016 - 2017 NVIDIA Corporation. Licensed under the
// NVDLA Open Hardware License; Check "LICENSE" which comes with
// this distribution for more information.
// ================================================================
// File Name: NV_NVDLA_cfgrom.v
`include "simulate_x_tick.vh"
module NV_NVDLA_cfgrom (
   nvdla_core_clk
  ,nvdla_core_rstn
  ,csb2cfgrom_req_pd
  ,csb2cfgrom_req_pvld
  ,csb2cfgrom_req_prdy
  ,cfgrom2csb_resp_pd
  ,cfgrom2csb_resp_valid
  );
input nvdla_core_clk;
input nvdla_core_rstn;
input [62:0] csb2cfgrom_req_pd;
input csb2cfgrom_req_pvld;
output csb2cfgrom_req_prdy;
output [33:0] cfgrom2csb_resp_pd;
output cfgrom2csb_resp_valid;
/////////////////////////////////////////////
wire csb_rresp_error;
wire [33:0] csb_rresp_pd_w;
wire [31:0] csb_rresp_rdat;
wire csb_wresp_error;
wire [33:0] csb_wresp_pd_w;
wire [31:0] csb_wresp_rdat;
wire [23:0] reg_offset;
wire [31:0] reg_rd_data;
wire reg_rd_en;
wire [31:0] reg_wr_data;
wire reg_wr_en;
wire [21:0] req_addr;
wire [1:0] req_level;
wire req_nposted;
wire req_srcpriv;
wire [31:0] req_wdat;
wire [3:0] req_wrbe;
wire req_write;
reg [33:0] cfgrom2csb_resp_pd;
reg cfgrom2csb_resp_valid;
reg [62:0] req_pd;
reg req_pvld;
////////////////////////////////////////////////////////////////////////
NV_NVDLA_CFGROM_rom u_NV_NVDLA_CFGROM_rom (
   .reg_rd_data (reg_rd_data[31:0])
  ,.reg_offset (reg_offset[11:0])
  ,.reg_wr_data (reg_wr_data[31:0])
  ,.reg_wr_en (reg_wr_en)
  ,.nvdla_core_clk (nvdla_core_clk)
  ,.nvdla_core_rstn (nvdla_core_rstn)
  );
////////////////////////////////////////////////////////////////////////
// //
// GENERATE CSB TO REGISTER CONNECTION LOGIC //
// //
////////////////////////////////////////////////////////////////////////
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    req_pvld <= 1'b0;
  end else begin
  req_pvld <= csb2cfgrom_req_pvld;
  end
end
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    req_pd <= {63{1'b0}};
  end else begin
  if ((csb2cfgrom_req_pvld) == 1'b1) begin
    req_pd <= csb2cfgrom_req_pd;
  end
  end
end
// PKT_UNPACK_WIRE( csb2xx_16m_be_lvl , req_ , req_pd )
assign req_addr[21:0] = req_pd[21:0];
assign req_wdat[31:0] = req_pd[53:22];
assign req_write = req_pd[54];
assign req_nposted = req_pd[55];
assign req_srcpriv = req_pd[56];
assign req_wrbe[3:0] = req_pd[60:57];
assign req_level[1:0] = req_pd[62:61];
assign csb2cfgrom_req_prdy = 1'b1;
//Address in CSB master is word aligned while address in regfile is byte aligned.
assign reg_offset = {req_addr, 2'b0};
assign reg_wr_data = req_wdat;
assign reg_wr_en = req_pvld & req_write;
assign reg_rd_en = req_pvld & ~req_write;
assign csb_rresp_pd_w[31:0] = csb_rresp_rdat[31:0];
assign csb_rresp_pd_w[32] = csb_rresp_error ;
assign csb_rresp_pd_w[33:33] = 1'd0 /* PKT_nvdla_xx2csb_resp_dla_xx2csb_rd_erpt_ID  */ ;
assign csb_wresp_pd_w[31:0] = csb_wresp_rdat[31:0];
assign csb_wresp_pd_w[32] = csb_wresp_error ;
assign csb_wresp_pd_w[33:33] = 1'd1 /* PKT_nvdla_xx2csb_resp_dla_xx2csb_wr_erpt_ID  */ ;
assign csb_rresp_rdat = reg_rd_data;
assign csb_rresp_error = 1'b0;
assign csb_wresp_rdat = {32{1'b0}};
assign csb_wresp_error = 1'b0;
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    cfgrom2csb_resp_pd <= {34{1'b0}};
  end else begin
    if(reg_rd_en)
    begin
        cfgrom2csb_resp_pd <= csb_rresp_pd_w;
    end
    else if(reg_wr_en & req_nposted)
    begin
        cfgrom2csb_resp_pd <= csb_wresp_pd_w;
    end
  end
end
always @(posedge nvdla_core_clk or negedge nvdla_core_rstn) begin
  if (!nvdla_core_rstn) begin
    cfgrom2csb_resp_valid <= 1'b0;
  end else begin
    cfgrom2csb_resp_valid <= (reg_wr_en & req_nposted) | reg_rd_en;
  end
end
endmodule