/*********************************************************************
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/*********************************************************************
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SDRAM Controller buswidth converter
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SDRAM Controller buswidth converter
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This file is part of the sdram controller project
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This file is part of the sdram controller project
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http://www.opencores.org/cores/sdr_ctrl/
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http://www.opencores.org/cores/sdr_ctrl/
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Description: SDRAM Controller Buswidth converter
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Description: SDRAM Controller Buswidth converter
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This module does write/read data transalation between
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This module does write/read data transalation between
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application data to SDRAM bus width
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application data to SDRAM bus width
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To Do:
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To Do:
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nothing
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nothing
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Author(s):
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Author(s):
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- Dinesh Annayya, dinesha@opencores.org
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- Dinesh Annayya, dinesha@opencores.org
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Version : 1.0 - 8th Jan 2012
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Version : 1.0 - 8th Jan 2012
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Copyright (C) 2000 Authors and OPENCORES.ORG
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Copyright (C) 2000 Authors and OPENCORES.ORG
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This source file may be used and distributed without
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This source file may be used and distributed without
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restriction provided that this copyright statement is not
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restriction provided that this copyright statement is not
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removed from the file and that any derivative work contains
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removed from the file and that any derivative work contains
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the original copyright notice and the associated disclaimer.
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the original copyright notice and the associated disclaimer.
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This source file is free software; you can redistribute it
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This source file is free software; you can redistribute it
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and/or modify it under the terms of the GNU Lesser General
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and/or modify it under the terms of the GNU Lesser General
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Public License as published by the Free Software Foundation;
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Public License as published by the Free Software Foundation;
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either version 2.1 of the License, or (at your option) any
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either version 2.1 of the License, or (at your option) any
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later version.
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later version.
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This source is distributed in the hope that it will be
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This source is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Lesser General Public License for more
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PURPOSE. See the GNU Lesser General Public License for more
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details.
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details.
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You should have received a copy of the GNU Lesser General
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You should have received a copy of the GNU Lesser General
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Public License along with this source; if not, download it
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Public License along with this source; if not, download it
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from http://www.opencores.org/lgpl.shtml
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from http://www.opencores.org/lgpl.shtml
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*******************************************************************/
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*******************************************************************/
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`include "sdrc.def"
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`include "sdrc.def"
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module sdrc_bs_convert (
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module sdrc_bs_convert (
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clk,
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clk,
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reset_n,
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reset_n,
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sdr_width,
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sdr_width,
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app_req_addr,
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app_req_addr,
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app_req_addr_int,
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app_req_addr_int,
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app_req_len,
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app_req_len,
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app_req_len_int,
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app_req_len_int,
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app_sdr_req,
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app_sdr_req,
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app_sdr_req_int,
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app_sdr_req_int,
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app_req_dma_last,
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app_req_dma_last,
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app_req_dma_last_int,
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app_req_dma_last_int,
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app_req_wr_n,
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app_req_wr_n,
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app_req_ack,
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app_req_ack,
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app_req_ack_int,
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app_req_ack_int,
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app_wr_data,
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app_wr_data,
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app_wr_data_int,
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app_wr_data_int,
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app_wr_en_n,
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app_wr_en_n,
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app_wr_en_n_int,
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app_wr_en_n_int,
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app_wr_next_int,
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app_wr_next_int,
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app_wr_next,
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app_wr_next,
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app_rd_data_int,
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app_rd_data_int,
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app_rd_data,
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app_rd_data,
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app_rd_valid_int,
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app_rd_valid_int,
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app_rd_valid
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app_rd_valid
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);
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);
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parameter APP_AW = 30; // Application Address Width
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parameter APP_AW = 30; // Application Address Width
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parameter APP_DW = 32; // Application Data Width
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parameter APP_DW = 32; // Application Data Width
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parameter APP_BW = 4; // Application Byte Width
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parameter APP_BW = 4; // Application Byte Width
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parameter APP_RW = 9; // Application Request Width
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parameter APP_RW = 9; // Application Request Width
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parameter SDR_DW = 16; // SDR Data Width
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parameter SDR_DW = 16; // SDR Data Width
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parameter SDR_BW = 2; // SDR Byte Width
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parameter SDR_BW = 2; // SDR Byte Width
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input clk;
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input clk;
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input reset_n ;
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input reset_n ;
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input [1:0] sdr_width ; // 2'b00 - 32 Bit SDR, 2'b01 - 16 Bit SDR, 2'b1x - 8 Bit
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input [1:0] sdr_width ; // 2'b00 - 32 Bit SDR, 2'b01 - 16 Bit SDR, 2'b1x - 8 Bit
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input [APP_AW-1:0] app_req_addr;
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input [APP_AW-1:0] app_req_addr;
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output [APP_AW:0] app_req_addr_int;
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output [APP_AW:0] app_req_addr_int;
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input [APP_RW-1:0] app_req_len ;
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input [APP_RW-1:0] app_req_len ;
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output [APP_RW-1:0] app_req_len_int;
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output [APP_RW-1:0] app_req_len_int;
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input app_req_wr_n;
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input app_req_wr_n;
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input app_sdr_req;
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input app_sdr_req;
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output app_sdr_req_int;
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output app_sdr_req_int;
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input app_req_dma_last;
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input app_req_dma_last;
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output app_req_dma_last_int;
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output app_req_dma_last_int;
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input app_req_ack_int;
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input app_req_ack_int;
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output app_req_ack;
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output app_req_ack;
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input [APP_DW-1:0] app_wr_data;
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input [APP_DW-1:0] app_wr_data;
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output [SDR_DW-1:0] app_wr_data_int;
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output [SDR_DW-1:0] app_wr_data_int;
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input [APP_BW-1:0] app_wr_en_n;
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input [APP_BW-1:0] app_wr_en_n;
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output [SDR_BW-1:0] app_wr_en_n_int;
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output [SDR_BW-1:0] app_wr_en_n_int;
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input app_wr_next_int;
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input app_wr_next_int;
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output app_wr_next;
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output app_wr_next;
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input [SDR_DW-1:0] app_rd_data_int;
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input [SDR_DW-1:0] app_rd_data_int;
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output [APP_DW-1:0] app_rd_data;
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output [APP_DW-1:0] app_rd_data;
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input app_rd_valid_int;
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input app_rd_valid_int;
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output app_rd_valid;
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output app_rd_valid;
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reg [APP_AW:0] app_req_addr_int;
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reg [APP_AW:0] app_req_addr_int;
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reg [APP_RW-1:0] app_req_len_int;
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reg [APP_RW-1:0] app_req_len_int;
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reg app_req_dma_last_int;
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reg app_req_dma_last_int;
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reg app_sdr_req_int;
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reg app_sdr_req_int;
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reg app_req_ack;
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reg app_req_ack;
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reg [APP_DW-1:0] app_rd_data;
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reg [APP_DW-1:0] app_rd_data;
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reg app_rd_valid;
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reg app_rd_valid;
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reg [SDR_DW-1:0] app_wr_data_int;
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reg [SDR_DW-1:0] app_wr_data_int;
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reg [SDR_BW-1:0] app_wr_en_n_int;
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reg [SDR_BW-1:0] app_wr_en_n_int;
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reg app_wr_next;
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reg app_wr_next;
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reg [23:0] saved_rd_data;
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reg [23:0] saved_rd_data;
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reg [7:0] rd_xfr_count;
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reg [7:0] rd_xfr_count;
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reg [7:0] wr_xfr_count;
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reg [7:0] wr_xfr_count;
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wire ok_to_req;
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wire ok_to_req;
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assign ok_to_req = ((wr_xfr_count == 0) && (rd_xfr_count == 0));
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assign ok_to_req = ((wr_xfr_count == 0) && (rd_xfr_count == 0));
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always @(*) begin
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always @(*) begin
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if(sdr_width == 2'b00) // 32 Bit SDR Mode
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if(sdr_width == 2'b00) // 32 Bit SDR Mode
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begin
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begin
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app_req_addr_int = {1'b0,app_req_addr};
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app_req_addr_int = {1'b0,app_req_addr};
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app_req_len_int = app_req_len;
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app_req_len_int = app_req_len;
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app_wr_data_int = app_wr_data;
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app_wr_data_int = app_wr_data;
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app_wr_en_n_int = app_wr_en_n;
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app_wr_en_n_int = app_wr_en_n;
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app_req_dma_last_int = app_req_dma_last;
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app_req_dma_last_int = app_req_dma_last;
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app_sdr_req_int = app_sdr_req;
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app_sdr_req_int = app_sdr_req;
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app_wr_next = app_wr_next_int;
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app_wr_next = app_wr_next_int;
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app_rd_data = app_rd_data_int;
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app_rd_data = app_rd_data_int;
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app_rd_valid = app_rd_valid_int;
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app_rd_valid = app_rd_valid_int;
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app_req_ack = app_req_ack_int;
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app_req_ack = app_req_ack_int;
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end
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end
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else if(sdr_width == 2'b01) // 16 Bit SDR Mode
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else if(sdr_width == 2'b01) // 16 Bit SDR Mode
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begin
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begin
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// Changed the address and length to match the 16 bit SDR Mode
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// Changed the address and length to match the 16 bit SDR Mode
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app_req_addr_int = {app_req_addr,1'b0};
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app_req_addr_int = {app_req_addr,1'b0};
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app_req_len_int = {app_req_len,1'b0};
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app_req_len_int = {app_req_len,1'b0};
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app_req_dma_last_int = app_req_dma_last;
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app_req_dma_last_int = app_req_dma_last;
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app_sdr_req_int = app_sdr_req && ok_to_req;
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app_sdr_req_int = app_sdr_req && ok_to_req;
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app_req_ack = app_req_ack_int;
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app_req_ack = app_req_ack_int;
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app_wr_next = (app_wr_next_int & wr_xfr_count[0]);
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app_wr_next = (app_wr_next_int & wr_xfr_count[0]);
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app_rd_valid = (rd_xfr_count & rd_xfr_count[0]);
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app_rd_valid = (rd_xfr_count & rd_xfr_count[0]);
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if(wr_xfr_count[0] == 1'b1)
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if(wr_xfr_count[0] == 1'b1)
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begin
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begin
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app_wr_en_n_int = app_wr_en_n[3:2];
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app_wr_en_n_int = app_wr_en_n[3:2];
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app_wr_data_int = app_wr_data[31:16];
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app_wr_data_int = app_wr_data[31:16];
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end
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end
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else
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else
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begin
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begin
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app_wr_en_n_int = app_wr_en_n[1:0];
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app_wr_en_n_int = app_wr_en_n[1:0];
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app_wr_data_int = app_wr_data[15:0];
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app_wr_data_int = app_wr_data[15:0];
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end
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end
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app_rd_data = {app_rd_data_int,saved_rd_data[15:0]};
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app_rd_data = {app_rd_data_int,saved_rd_data[15:0]};
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end else // 8 Bit SDR Mode
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end else // 8 Bit SDR Mode
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begin
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begin
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// Changed the address and length to match the 16 bit SDR Mode
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// Changed the address and length to match the 16 bit SDR Mode
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app_req_addr_int = {app_req_addr,2'b0};
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app_req_addr_int = {app_req_addr,2'b0};
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app_req_len_int = {app_req_len,2'b0};
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app_req_len_int = {app_req_len,2'b0};
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app_req_dma_last_int = app_req_dma_last;
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app_req_dma_last_int = app_req_dma_last;
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app_sdr_req_int = app_sdr_req && ok_to_req;
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app_sdr_req_int = app_sdr_req && ok_to_req;
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app_req_ack = app_req_ack_int;
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app_req_ack = app_req_ack_int;
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app_wr_next = (app_wr_next_int & (wr_xfr_count[1:0]== 2'b01));
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app_wr_next = (app_wr_next_int & (wr_xfr_count[1:0]== 2'b01));
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app_rd_valid = (rd_xfr_count & (rd_xfr_count[1:0]== 2'b01));
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app_rd_valid = (rd_xfr_count & (rd_xfr_count[1:0]== 2'b01));
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// Note: counter is down counter from 00 -> 11 -> 10 -> 01 --> 00
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// Note: counter is down counter from 00 -> 11 -> 10 -> 01 --> 00
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if(wr_xfr_count[1:0] == 2'b01)
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if(wr_xfr_count[1:0] == 2'b01)
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begin
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begin
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app_wr_en_n_int = app_wr_en_n[3];
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app_wr_en_n_int = app_wr_en_n[3];
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app_wr_data_int = app_wr_data[31:24];
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app_wr_data_int = app_wr_data[31:24];
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end
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end
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else if(wr_xfr_count[1:0] == 2'b10)
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else if(wr_xfr_count[1:0] == 2'b10)
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begin
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begin
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app_wr_en_n_int = app_wr_en_n[2];
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app_wr_en_n_int = app_wr_en_n[2];
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app_wr_data_int = app_wr_data[23:16];
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app_wr_data_int = app_wr_data[23:16];
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end
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end
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else if(wr_xfr_count[1:0] == 2'b11)
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else if(wr_xfr_count[1:0] == 2'b11)
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begin
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begin
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app_wr_en_n_int = app_wr_en_n[1];
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app_wr_en_n_int = app_wr_en_n[1];
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app_wr_data_int = app_wr_data[15:8];
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app_wr_data_int = app_wr_data[15:8];
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end
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end
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else begin
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else begin
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app_wr_en_n_int = app_wr_en_n[0];
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app_wr_en_n_int = app_wr_en_n[0];
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app_wr_data_int = app_wr_data[7:0];
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app_wr_data_int = app_wr_data[7:0];
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end
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end
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app_rd_data = {app_rd_data_int,saved_rd_data[23:0]};
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app_rd_data = {app_rd_data_int,saved_rd_data[23:0]};
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end
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end
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end
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end
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reg lcl_mc_req_wr_n;
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reg lcl_mc_req_wr_n;
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always @(posedge clk)
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always @(posedge clk)
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begin
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begin
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if(!reset_n)
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if(!reset_n)
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begin
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begin
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rd_xfr_count <= 8'b0;
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rd_xfr_count <= 8'b0;
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wr_xfr_count <= 8'b0;
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wr_xfr_count <= 8'b0;
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lcl_mc_req_wr_n <= 1'b1;
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lcl_mc_req_wr_n <= 1'b1;
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saved_rd_data <= 24'h0;
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saved_rd_data <= 24'h0;
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end
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end
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else begin
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else begin
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if(app_req_ack)
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lcl_mc_req_wr_n <= app_req_wr_n;
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lcl_mc_req_wr_n <= app_req_wr_n;
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// During Write Phase
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// During Write Phase
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if(app_req_ack && (app_req_wr_n == 0)) begin
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if(app_req_ack && (app_req_wr_n == 0)) begin
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wr_xfr_count <= app_req_len_int;
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wr_xfr_count <= app_req_len_int;
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end
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end
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else if(app_wr_next_int & !lcl_mc_req_wr_n) begin
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else if(app_wr_next_int & !lcl_mc_req_wr_n) begin
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wr_xfr_count <= wr_xfr_count - 1'b1;
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wr_xfr_count <= wr_xfr_count - 1'b1;
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end
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end
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// During Read Phase
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// During Read Phase
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if(app_req_ack && app_req_wr_n) begin
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if(app_req_ack && app_req_wr_n) begin
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rd_xfr_count <= app_req_len_int;
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rd_xfr_count <= app_req_len_int;
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end
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end
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else if(app_rd_valid_int & lcl_mc_req_wr_n) begin
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else if(app_rd_valid_int & lcl_mc_req_wr_n) begin
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rd_xfr_count <= rd_xfr_count - 1'b1;
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rd_xfr_count <= rd_xfr_count - 1'b1;
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if(sdr_width == 2'b01) // 16 Bit SDR Mode
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if(sdr_width == 2'b01) // 16 Bit SDR Mode
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saved_rd_data[15:0] <= app_rd_data_int;
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saved_rd_data[15:0] <= app_rd_data_int;
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else begin// 8 bit SDR Mode -
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else begin// 8 bit SDR Mode -
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// Note: counter is down counter from 00 -> 11 -> 10 -> 01 --> 00
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// Note: counter is down counter from 00 -> 11 -> 10 -> 01 --> 00
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if(rd_xfr_count[1:0] == 2'b00) saved_rd_data[7:0] <= app_rd_data_int[7:0];
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if(rd_xfr_count[1:0] == 2'b00) saved_rd_data[7:0] <= app_rd_data_int[7:0];
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else if(rd_xfr_count[1:0] == 2'b11) saved_rd_data[15:8] <= app_rd_data_int[7:0];
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else if(rd_xfr_count[1:0] == 2'b11) saved_rd_data[15:8] <= app_rd_data_int[7:0];
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else if(rd_xfr_count[1:0] == 2'b10) saved_rd_data[23:16] <= app_rd_data_int[7:0];
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else if(rd_xfr_count[1:0] == 2'b10) saved_rd_data[23:16] <= app_rd_data_int[7:0];
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end
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end
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end
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end
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end
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end
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end
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end
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endmodule // sdr_bs_convert
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endmodule // sdr_bs_convert
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