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///////////////////////////////////////////////////////////////////// //// //// //// WISHBONE Memory Controller Main Timing Block //// //// //// //// //// //// Author: Rudolf Usselmann //// //// rudi@asics.ws //// //// //// //// //// //// Downloaded from: http://www.opencores.org/cores/mem_ctrl/ //// //// //// ///////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2000 Rudolf Usselmann //// //// rudi@asics.ws //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer.//// //// //// //// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY //// //// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED //// //// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS //// //// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR //// //// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, //// //// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES //// //// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE //// //// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR //// //// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF //// //// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT //// //// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT //// //// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE //// //// POSSIBILITY OF SUCH DAMAGE. //// //// //// ///////////////////////////////////////////////////////////////////// // CVS Log // // $Id: mc_timing.v,v 1.7 2001-12-21 05:09:30 rudi Exp $ // // $Date: 2001-12-21 05:09:30 $ // $Revision: 1.7 $ // $Author: rudi $ // $Locker: $ // $State: Exp $ // // Change History: // $Log: not supported by cvs2svn $ // Revision 1.6 2001/12/11 02:47:19 rudi // // - Made some changes not to expect clock during reset ... // // Revision 1.5 2001/11/29 02:16:28 rudi // // // - More Synthesis cleanup, mostly for speed // - Several bug fixes // - Changed code to avoid auto-precharge and // burst-terminate combinations (apparently illegal ?) // Now we will do a manual precharge ... // // Revision 1.4 2001/09/24 00:38:21 rudi // // Changed Reset to be active high and async. // // Revision 1.3 2001/09/02 02:28:28 rudi // // Many fixes for minor bugs that showed up in gate level simulations. // // Revision 1.2 2001/08/10 08:16:21 rudi // // - Changed IO names to be more clear. // - Uniquifyed define names to be core specific. // - Removed "Refresh Early" configuration // // Revision 1.1 2001/07/29 07:34:41 rudi // // // 1) Changed Directory Structure // 2) Fixed several minor bugs // // Revision 1.4 2001/06/14 01:57:37 rudi // // // Fixed a potential bug in a corner case situation where the TMS register // does not propegate properly during initialisation. // // Revision 1.3 2001/06/12 15:19:49 rudi // // // Minor changes after running lint, and a small bug fix reading csr and ba_mask registers. // // Revision 1.2 2001/06/03 11:37:17 rudi // // // 1) Fixed Chip Select Mask Register // - Power On Value is now all ones // - Comparison Logic is now correct // // 2) All resets are now asynchronous // // 3) Converted Power On Delay to an configurable item // // 4) Added reset to Chip Select Output Registers // // 5) Forcing all outputs to Hi-Z state during reset // // Revision 1.1.1.1 2001/05/13 09:39:44 rudi // Created Directory Structure // // // // `include "mc_defines.v" module mc_timing(clk, rst, // Wishbone Interface wb_cyc_i, wb_stb_i, wb_we_i, wb_read_go, wb_write_go, wb_first, wb_wait, mem_ack, err, // Suspend/Resume Interface susp_req, resume_req, suspended, susp_sel, // Memory Interface mc_clk, data_oe, oe_, we_, cas_, ras_, cke_, cs_en, wb_cycle, wr_cycle, mc_br, mc_bg, mc_adsc, mc_adv, mc_c_oe, mc_ack, // Register File Interface csc, tms, cs, lmr_req, lmr_ack, cs_le_d, cs_le, // Address Select Signals cmd_a10, row_sel, next_adr, page_size, // OBCT Signals bank_set, bank_clr, bank_clr_all, bank_open, any_bank_open, row_same, // Data path Controller Signals dv, pack_le0, pack_le1, pack_le2, par_err, // Refresh Counter Signals rfr_req, rfr_ack, // Initialize Request & Ack init_req, init_ack ); input clk; input rst; // Wishbone Interface input wb_cyc_i, wb_stb_i, wb_we_i; input wb_read_go; input wb_write_go; input wb_first; input wb_wait; output mem_ack; output err; // Suspend/Resume Interface input susp_req; input resume_req; output suspended; output susp_sel; // Memory Interface input mc_clk; output data_oe; output oe_; output we_; output cas_; output ras_; output cke_; output cs_en; output wb_cycle; output wr_cycle; input mc_br; output mc_bg; output mc_adsc; output mc_adv; output mc_c_oe; input mc_ack; // Register File Interface input [31:0] csc; input [31:0] tms; input [7:0] cs; input lmr_req; output lmr_ack; output cs_le; output cs_le_d; // Address Select Signals input [10:0] page_size; output cmd_a10; output row_sel; output next_adr; // OBCT Signals output bank_set; output bank_clr; output bank_clr_all; input bank_open; input any_bank_open; input row_same; // Data path Controller Signals output dv; output pack_le0, pack_le1, pack_le2; // Pack Latch Enable input par_err; // Refresh Counter Signals input rfr_req; output rfr_ack; // Initialize Request & Ack input init_req; output init_ack; //////////////////////////////////////////////////////////////////// // // Defines & Parameters // // Number of states: 66 parameter [65:0] // synopsys enum state // 6666666555555555544444444443333333333222222222211111111110000000000 // 6543210987654321098765432109876543210987654321098765432109876543210 POR = 66'b000000000000000000000000000000000000000000000000000000000000000001, IDLE = 66'b000000000000000000000000000000000000000000000000000000000000000010, IDLE_T = 66'b000000000000000000000000000000000000000000000000000000000000000100, IDLE_T2 = 66'b000000000000000000000000000000000000000000000000000000000000001000, PRECHARGE = 66'b000000000000000000000000000000000000000000000000000000000000010000, PRECHARGE_W = 66'b000000000000000000000000000000000000000000000000000000000000100000, ACTIVATE = 66'b000000000000000000000000000000000000000000000000000000000001000000, ACTIVATE_W = 66'b000000000000000000000000000000000000000000000000000000000010000000, SD_RD_WR = 66'b000000000000000000000000000000000000000000000000000000000100000000, SD_RD = 66'b000000000000000000000000000000000000000000000000000000001000000000, SD_RD_W = 66'b000000000000000000000000000000000000000000000000000000010000000000, SD_RD_LOOP = 66'b000000000000000000000000000000000000000000000000000000100000000000, SD_RD_W2 = 66'b000000000000000000000000000000000000000000000000000001000000000000, SD_WR = 66'b000000000000000000000000000000000000000000000000000010000000000000, SD_WR_W = 66'b000000000000000000000000000000000000000000000000000100000000000000, BT = 66'b000000000000000000000000000000000000000000000000001000000000000000, BT_W = 66'b000000000000000000000000000000000000000000000000010000000000000000, REFR = 66'b000000000000000000000000000000000000000000000000100000000000000000, LMR0 = 66'b000000000000000000000000000000000000000000000001000000000000000000, LMR1 = 66'b000000000000000000000000000000000000000000000010000000000000000000, LMR2 = 66'b000000000000000000000000000000000000000000000100000000000000000000, // 6666666555555555544444444443333333333222222222211111111110000000000 // 6543210987654321098765432109876543210987654321098765432109876543210 INIT0 = 66'b000000000000000000000000000000000000000000001000000000000000000000, INIT = 66'b000000000000000000000000000000000000000000010000000000000000000000, INIT_W = 66'b000000000000000000000000000000000000000000100000000000000000000000, INIT_REFR1 = 66'b000000000000000000000000000000000000000001000000000000000000000000, INIT_REFR1_W = 66'b000000000000000000000000000000000000000010000000000000000000000000, // 6666666555555555544444444443333333333222222222211111111110000000000 // 6543210987654321098765432109876543210987654321098765432109876543210 INIT_LMR = 66'b000000000000000000000000000000000000000100000000000000000000000000, SUSP1 = 66'b000000000000000000000000000000000000001000000000000000000000000000, SUSP2 = 66'b000000000000000000000000000000000000010000000000000000000000000000, SUSP3 = 66'b000000000000000000000000000000000000100000000000000000000000000000, SUSP4 = 66'b000000000000000000000000000000000001000000000000000000000000000000, RESUME1 = 66'b000000000000000000000000000000000010000000000000000000000000000000, RESUME2 = 66'b000000000000000000000000000000000100000000000000000000000000000000, BG0 = 66'b000000000000000000000000000000001000000000000000000000000000000000, BG1 = 66'b000000000000000000000000000000010000000000000000000000000000000000, BG2 = 66'b000000000000000000000000000000100000000000000000000000000000000000, ACS_RD = 66'b000000000000000000000000000001000000000000000000000000000000000000, ACS_RD1 = 66'b000000000000000000000000000010000000000000000000000000000000000000, ACS_RD2A = 66'b000000000000000000000000000100000000000000000000000000000000000000, ACS_RD2 = 66'b000000000000000000000000001000000000000000000000000000000000000000, ACS_RD3 = 66'b000000000000000000000000010000000000000000000000000000000000000000, ACS_RD_8_1 = 66'b000000000000000000000000100000000000000000000000000000000000000000, ACS_RD_8_2 = 66'b000000000000000000000001000000000000000000000000000000000000000000, ACS_RD_8_3 = 66'b000000000000000000000010000000000000000000000000000000000000000000, ACS_RD_8_4 = 66'b000000000000000000000100000000000000000000000000000000000000000000, ACS_RD_8_5 = 66'b000000000000000000001000000000000000000000000000000000000000000000, ACS_RD_8_6 = 66'b000000000000000000010000000000000000000000000000000000000000000000, ACS_WR = 66'b000000000000000000100000000000000000000000000000000000000000000000, ACS_WR1 = 66'b000000000000000001000000000000000000000000000000000000000000000000, ACS_WR2 = 66'b000000000000000010000000000000000000000000000000000000000000000000, ACS_WR3 = 66'b000000000000000100000000000000000000000000000000000000000000000000, ACS_WR4 = 66'b000000000000001000000000000000000000000000000000000000000000000000, SRAM_RD = 66'b000000000000010000000000000000000000000000000000000000000000000000, SRAM_RD0 = 66'b000000000000100000000000000000000000000000000000000000000000000000, SRAM_RD1 = 66'b000000000001000000000000000000000000000000000000000000000000000000, SRAM_RD2 = 66'b000000000010000000000000000000000000000000000000000000000000000000, SRAM_RD3 = 66'b000000000100000000000000000000000000000000000000000000000000000000, SRAM_RD4 = 66'b000000001000000000000000000000000000000000000000000000000000000000, SRAM_WR = 66'b000000010000000000000000000000000000000000000000000000000000000000, SRAM_WR0 = 66'b000000100000000000000000000000000000000000000000000000000000000000, SCS_RD = 66'b000001000000000000000000000000000000000000000000000000000000000000, SCS_RD1 = 66'b000010000000000000000000000000000000000000000000000000000000000000, SCS_RD2 = 66'b000100000000000000000000000000000000000000000000000000000000000000, SCS_WR = 66'b001000000000000000000000000000000000000000000000000000000000000000, SCS_WR1 = 66'b010000000000000000000000000000000000000000000000000000000000000000, SCS_ERR = 66'b100000000000000000000000000000000000000000000000000000000000000000; //////////////////////////////////////////////////////////////////// // // Local Registers & Wires // reg [65:0] /* synopsys enum state */ state, next_state; // synopsys state_vector state reg mc_bg; wire [2:0] mem_type; wire [1:0] bus_width; wire kro; wire cs_a; reg [3:0] cmd; wire mem_ack; wire mem_ack_s; reg mem_ack_d; reg err_d; wire err; reg cmd_a10; reg lmr_ack; reg lmr_ack_d; reg row_sel; reg oe_; reg oe_d; reg data_oe; reg data_oe_d; reg cke_d; reg cke_; reg init_ack; reg dv; reg rfr_ack_d; reg mc_adsc; reg mc_adv; reg bank_set; reg bank_clr; reg bank_clr_all; reg wr_set, wr_clr; reg wr_cycle; reg cmd_asserted; reg cmd_asserted2; reg [10:0] burst_val; reg [10:0] burst_cnt; wire burst_act; reg burst_act_rd; wire single_write; reg cs_le_d; reg cs_le; reg cs_le_r; reg susp_req_r; reg resume_req_r; reg suspended; reg suspended_d; reg susp_sel_set, susp_sel_clr, susp_sel_r; reg [3:0] cmd_del; reg [3:0] cmd_r; reg data_oe_r; reg data_oe_r2; reg cke_r; reg cke_rd; reg cke_o_del; reg cke_o_r1; reg cke_o_r2; reg wb_cycle_set, wb_cycle; reg [3:0] ack_cnt; wire ack_cnt_is_0; reg cnt, cnt_next; reg [7:0] timer; reg tmr_ld_trp, tmr_ld_trcd, tmr_ld_tcl, tmr_ld_trfc; reg tmr_ld_twr, tmr_ld_txsr; reg tmr2_ld_tscsto; reg tmr_ld_trdv; reg tmr_ld_trdz; reg tmr_ld_twr2; wire timer_is_zero; reg tmr_done; reg tmr2_ld_trdv, tmr2_ld_trdz; reg tmr2_ld_twpw, tmr2_ld_twd, tmr2_ld_twwd; reg tmr2_ld_tsrdv; reg [8:0] timer2; reg tmr2_done; wire timer2_is_zero; reg [3:0] ir_cnt; reg ir_cnt_ld; reg ir_cnt_dec; reg ir_cnt_done; reg rfr_ack_r; reg burst_cnt_ld; reg burst_fp; reg wb_wait_r, wb_wait_r2; reg lookup_ready1, lookup_ready2; reg burst_cnt_ld_4; reg dv_r; reg mc_adv_r1, mc_adv_r; reg next_adr; reg pack_le0, pack_le1, pack_le2; reg pack_le0_d, pack_le1_d, pack_le2_d; wire bw8, bw16; reg mc_c_oe_d; reg mc_c_oe; reg mc_le; reg mem_ack_r; reg rsts, rsts1; reg no_wb_cycle; wire bc_dec; reg ap_en; // Auto Precharge Enable reg cmd_a10_r; reg wb_stb_first; reg tmr_ld_tavav; //////////////////////////////////////////////////////////////////// // // Aliases // assign mem_type = csc[3:1]; assign bus_width = csc[5:4]; assign kro = csc[10]; assign single_write = tms[9] | (tms[2:0] == 3'h0); //////////////////////////////////////////////////////////////////// // // Misc Logic // reg cs_le_r1; always @(posedge clk) lmr_ack <= #1 lmr_ack_d; assign rfr_ack = rfr_ack_r; always @(posedge clk) cs_le_r <= #1 cs_le_r1; always @(posedge clk) cs_le_r1 <= #1 cs_le; always @(posedge clk) cs_le <= #1 cs_le_d; always @(posedge mc_clk or posedge rst) if(rst) rsts1 <= #1 1'b1; else rsts1 <= #1 1'b0; always @(posedge clk or posedge rst) if(rst) rsts <= #1 1'b1; else rsts <= #1 rsts1; // Control Signals Output Enable always @(posedge clk or posedge rst) if(rst) mc_c_oe <= #1 1'b0; else mc_c_oe <= #1 mc_c_oe_d; always @(posedge clk or posedge rsts) if(rsts) mc_le <= #1 1'b0; else mc_le <= #1 ~mc_le; always @(posedge clk) pack_le0 <= #1 pack_le0_d; always @(posedge clk) pack_le1 <= #1 pack_le1_d; always @(posedge clk) pack_le2 <= #1 pack_le2_d; always @(posedge clk or posedge rst) if(rst) mc_adv_r1 <= #1 1'b0; else if(!mc_le) mc_adv_r1 <= #1 mc_adv; always @(posedge clk or posedge rst) if(rst) mc_adv_r <= #1 1'b0; else if(!mc_le) mc_adv_r <= #1 mc_adv_r1; // Bus Width decoder assign bw8 = (bus_width == `MC_BW_8); assign bw16 = (bus_width == `MC_BW_16); // Any Chip Select assign cs_a = |cs; // Memory to Wishbone Ack assign mem_ack = (mem_ack_d | mem_ack_s) & (wb_read_go | wb_write_go); always @(posedge clk or posedge rst) if(rst) mem_ack_r <= #1 1'b0; else mem_ack_r <= #1 mem_ack; assign err = err_d; // SDRAM Command, either delayed (for writes) or straight through always @(posedge clk or posedge rst) if(rst) cmd_r <= #1 `MC_CMD_NOP; else cmd_r <= #1 cmd; always @(posedge clk or posedge rst) if(rst) cmd_del <= #1 `MC_CMD_NOP; else cmd_del <= #1 cmd_r; assign {cs_en, ras_, cas_, we_} = wr_cycle ? cmd_del : cmd; // Track Timing of Asserting a command always @(posedge clk or posedge rst) if(rst) cmd_asserted <= #1 1'b0; else if(!mc_le) cmd_asserted <= #1 cmd[3]; always @(posedge clk or posedge rst) if(rst) cmd_asserted2 <= #1 1'b0; else if(!mc_le) cmd_asserted2 <= #1 cmd_asserted; // Output Enable always @(posedge clk or posedge rst) if(rst) oe_ <= #1 1'b1; else oe_ <= #1 ~oe_d; // Memory Bus Data lines Output Enable always @(posedge clk or posedge rst) if(rst) data_oe_r <= #1 1'b0; else data_oe_r <= #1 data_oe_d; always @(posedge clk or posedge rst) if(rst) data_oe_r2 <= #1 1'b0; else data_oe_r2 <= #1 data_oe_r; always @(posedge clk or posedge rst) if(rst) data_oe <= #1 1'b0; else data_oe <= #1 wr_cycle ? data_oe_r2 : data_oe_d; // Clock Enable always @(posedge clk) cke_r <= #1 cke_d; always @(posedge clk) cke_ <= #1 cke_r & cke_rd; // CKE output delay line to time DV for reads always @(posedge clk) cke_o_r1 <= #1 cke_; always @(posedge clk) cke_o_r2 <= #1 cke_o_r1; always @(posedge clk) cke_o_del <= #1 cke_o_r2; // Delayed version of the wb_wait input always @(posedge clk) wb_wait_r2 <= #1 wb_wait; always @(posedge clk) wb_wait_r <= #1 wb_wait_r2; // Indicates when the row_same and bank_open lookups are done reg lookup_ready1a; always @(posedge clk or posedge rst) if(rst) lookup_ready1 <= #1 1'b0; else lookup_ready1 <= #1 cs_le & wb_stb_i; always @(posedge clk or posedge rst) if(rst) lookup_ready2 <= #1 1'b0; else lookup_ready2 <= #1 lookup_ready1 & wb_stb_i; // Keep Track if it is a SDRAM write cycle always @(posedge clk or posedge rst) if(rst) wr_cycle <= #1 1'b0; else if(wr_set) wr_cycle <= #1 1'b1; else if(wr_clr) wr_cycle <= #1 1'b0; // Track when a cycle is *still* active always @(posedge clk or posedge rst) if(rst) wb_cycle <= #1 1'b0; else if(wb_cycle_set) wb_cycle <= #1 1'b1; else if(!wb_cyc_i) wb_cycle <= #1 1'b0; // Thses two signals are used to signal that no wishbone cycle is in // progress. Need to register them to avoid a very long combinatorial // path .... always @(posedge clk or posedge rst) if(rst) no_wb_cycle <= #1 1'b0; else no_wb_cycle <= #1 !wb_read_go & !wb_write_go; // Track ack's for read cycles always @(posedge clk or posedge rst) if(rst) ack_cnt <= #1 4'h0; else if(no_wb_cycle) ack_cnt <= #1 4'h0; else if(dv & !mem_ack_s) ack_cnt <= #1 ack_cnt + 4'h1; else if(!dv & mem_ack_s) ack_cnt <= #1 ack_cnt - 4'h1; assign ack_cnt_is_0 = (ack_cnt==4'h0); assign mem_ack_s = (ack_cnt != 4'h0) & !wb_wait & !mem_ack_r & wb_read_go & !(wb_we_i & wb_stb_i); // Internal Cycle Tracker always @(posedge clk) cnt <= #1 cnt_next; // Suspend/resume Logic always @(posedge clk or posedge rst) if(rst) susp_req_r <= #1 1'b0; else susp_req_r <= #1 susp_req; always @(posedge clk or posedge rst) if(rst) resume_req_r <= #1 1'b0; else resume_req_r <= #1 resume_req; always @(posedge clk or posedge rst) if(rst) suspended <= #1 1'b0; else suspended <= #1 suspended_d; always @(posedge clk or posedge rst) if(rst) rfr_ack_r <= #1 1'b0; else rfr_ack_r <= #1 rfr_ack_d; // Suspend Select Logic //assign susp_sel = susp_sel_r | susp_sel_set; assign susp_sel = susp_sel_r; always @(posedge clk or posedge rst) if(rst) susp_sel_r <= #1 1'b0; else if(susp_sel_set) susp_sel_r <= #1 1'b1; else if(susp_sel_clr) susp_sel_r <= #1 1'b0; //////////////////////////////////////////////////////////////////// // // Timing Logic // wire [3:0] twrp; wire twd_is_zero; wire [31:0] tms_x; // FIX_ME // Hard wire worst case or make it programmable ??? assign tms_x = (rfr_ack_d | rfr_ack_r | susp_sel | !mc_c_oe) ? 32'hffff_ffff : tms; always @(posedge clk) if(tmr2_ld_tscsto) timer2 <= #1 tms_x[24:16]; else if(tmr2_ld_tsrdv) timer2 <= #1 9'd4; // SSRAM RD->1st DATA VALID else if(tmr2_ld_twpw) timer2 <= #1 { 5'h0, tms_x[15:12]}; else if(tmr2_ld_twd) timer2 <= #1 { 4'h0, tms_x[19:16],1'b0}; else if(tmr2_ld_twwd) timer2 <= #1 { 3'h0, tms_x[25:20]}; else if(tmr2_ld_trdz) timer2 <= #1 { 4'h0, tms_x[11:8], 1'b1}; else if(tmr2_ld_trdv) timer2 <= #1 { tms_x[7:0], 1'b1}; else if(!timer2_is_zero) timer2 <= #1 timer2 - 9'b1; assign twd_is_zero = (tms_x[19:16] == 4'h0); assign timer2_is_zero = (timer2 == 9'h0); always @(posedge clk or posedge rst) if(rst) tmr2_done <= #1 1'b0; else tmr2_done <= #1 timer2_is_zero & !tmr2_ld_trdv & !tmr2_ld_trdz & !tmr2_ld_twpw & !tmr2_ld_twd & !tmr2_ld_twwd & !tmr2_ld_tscsto; assign twrp = {2'h0,tms_x[16:15]} + tms_x[23:20]; // SDRAM Memories timing tracker always @(posedge clk or posedge rst) `ifdef MC_POR_DELAY if(rst) timer <= #1 `MC_POR_DELAY_VAL ; else `endif if(tmr_ld_twr2) timer <= #1 { 4'h0, tms_x[15:12] }; else if(tmr_ld_trdz) timer <= #1 { 4'h0, tms_x[11:8] }; else if(tmr_ld_trdv) timer <= #1 tms_x[7:0]; else if(tmr_ld_twr) timer <= #1 { 4'h0, twrp}; else if(tmr_ld_trp) timer <= #1 { 4'h0, tms_x[23:20]}; else if(tmr_ld_trcd) timer <= #1 { 5'h0, tms_x[19:17]}; else if(tmr_ld_tcl) timer <= #1 { 6'h0, tms_x[05:04]}; else if(tmr_ld_trfc) timer <= #1 { 4'h0, tms_x[27:24]}; else if(tmr_ld_tavav) timer <= #1 8'h3; else if(tmr_ld_txsr) timer <= #1 8'h7; else if(!timer_is_zero & !mc_le) timer <= #1 timer - 8'b1; assign timer_is_zero = (timer == 8'h0); always @(posedge clk or posedge rst) if(rst) tmr_done <= #1 1'b0; else tmr_done <= #1 timer_is_zero; // Init Refresh Cycles Counter always @(posedge clk) if(ir_cnt_ld) ir_cnt <= #1 `MC_INIT_RFRC_CNT; else if(ir_cnt_dec) ir_cnt <= #1 ir_cnt - 4'b1; always @(posedge clk) ir_cnt_done <= #1 (ir_cnt == 4'h0); // Burst Counter always @(tms_x or page_size) case(tms_x[2:0]) // synopsys full_case parallel_case 3'h0: burst_val = 11'h1; 3'h1: burst_val = 11'h2; 3'h2: burst_val = 11'h4; 3'h3: burst_val = 11'h8; 3'h7: burst_val = page_size; endcase assign bc_dec = wr_cycle ? mem_ack_d : dv; always @(posedge clk) if(burst_cnt_ld_4) burst_cnt <= #1 11'h4; // for SSRAM only else if(burst_cnt_ld) burst_cnt <= #1 burst_val; else if(bc_dec) burst_cnt <= #1 burst_cnt - 11'h1; always @(posedge clk or posedge rst) if(rst) burst_fp <= #1 1'b0; else if(burst_cnt_ld) burst_fp <= #1 (tms_x[2:0] == 3'h7); // Auto Precharge Enable always @(posedge clk or posedge rst) if(rst) ap_en <= #1 1'b0; else if(burst_cnt_ld) ap_en <= #1 (tms_x[2:0] == 3'h0) & !kro; assign burst_act = |burst_cnt & ( |tms_x[2:0] ); always @(posedge clk) burst_act_rd <= #1 |burst_cnt; always @(posedge clk or posedge rst) if(rst) dv_r <= #1 1'b0; else dv_r <= #1 dv; always @(posedge clk) // Auto Precharge Holding Register cmd_a10_r <= #1 cmd_a10; //////////////////////////////////////////////////////////////////// // // Main State Machine // reg wb_write_go_r; always @(posedge clk) wb_write_go_r <= #1 wb_write_go; always @(posedge clk or posedge rst) if(rst) wb_stb_first <= #1 1'b0; else if(mem_ack) wb_stb_first <= #1 1'b0; else if(wb_first & wb_stb_i) wb_stb_first <= #1 1'b1; always @(posedge clk or posedge rst) `ifdef MC_POR_DELAY if(rst) state <= #1 POR; `else if(rst) state <= #1 IDLE; `endif else state <= #1 next_state; always @(state or cs_a or cs_le or cs_le_r or twd_is_zero or wb_stb_i or wb_write_go_r or wb_first or wb_read_go or wb_write_go or wb_wait or mem_ack_r or wb_we_i or ack_cnt_is_0 or wb_wait_r or cnt or wb_cycle or wr_cycle or mem_type or kro or lookup_ready2 or row_same or cmd_a10_r or bank_open or single_write or cmd_asserted or tmr_done or tmr2_done or ir_cnt_done or cmd_asserted2 or burst_act or burst_act_rd or burst_fp or cke_ or cke_r or cke_o_del or rfr_req or lmr_req or init_req or rfr_ack_r or susp_req_r or resume_req_r or mc_br or bw8 or bw16 or dv_r or mc_adv_r or mc_ack or wb_stb_first or ap_en ) begin next_state = state; // Default keep current state cnt_next = 1'b0; cmd = `MC_CMD_NOP; cmd_a10 = ap_en; oe_d = 1'b0; data_oe_d = 1'b0; cke_d = 1'b1; cke_rd = 1'b1; mc_adsc = 1'b0; mc_adv = 1'b0; bank_set = 1'b0; bank_clr = 1'b0; bank_clr_all = 1'b0; burst_cnt_ld = 1'b0; burst_cnt_ld_4 = 1'b0; tmr_ld_trp = 1'b0; tmr_ld_trcd = 1'b0; tmr_ld_tcl = 1'b0; tmr_ld_trfc = 1'b0; tmr_ld_twr = 1'b0; tmr_ld_txsr = 1'b0; tmr_ld_trdv = 1'b0; tmr_ld_trdz = 1'b0; tmr_ld_twr2 = 1'b0; tmr_ld_tavav = 1'b0; tmr2_ld_trdv = 1'b0; tmr2_ld_trdz = 1'b0; tmr2_ld_twpw = 1'b0; tmr2_ld_twd = 1'b0; tmr2_ld_twwd = 1'b0; tmr2_ld_tsrdv = 1'b0; tmr2_ld_tscsto = 1'b0; mem_ack_d = 1'b0; err_d = 1'b0; rfr_ack_d = 1'b0; lmr_ack_d = 1'b0; init_ack = 1'b0; ir_cnt_dec = 1'b0; ir_cnt_ld = 1'b0; row_sel = 1'b0; cs_le_d = 1'b0; wr_clr = 1'b0; wr_set = 1'b0; wb_cycle_set = 1'b0; dv = 1'b0; suspended_d = 1'b0; susp_sel_set = 1'b0; susp_sel_clr = 1'b0; mc_bg = 1'b0; next_adr = 1'b0; pack_le0_d = 1'b0; pack_le1_d = 1'b0; pack_le2_d = 1'b0; mc_c_oe_d = 1'b1; case(state) // synopsys full_case parallel_case `ifdef MC_POR_DELAY POR: begin if(tmr_done) next_state = IDLE; end `endif IDLE: begin cs_le_d = wb_stb_first | lmr_req; burst_cnt_ld = 1'b1; wr_clr = 1'b1; if(mem_type == `MC_MEM_TYPE_SCS) tmr2_ld_tscsto = 1'b1; if(mem_type == `MC_MEM_TYPE_SRAM) tmr2_ld_tsrdv = 1'b1; if(rfr_req) begin rfr_ack_d = 1'b1; next_state = PRECHARGE; end else if(init_req) begin cs_le_d = 1'b1; next_state = INIT0; end else if(lmr_req & lookup_ready2) begin lmr_ack_d = 1'b1; cs_le_d = 1'b1; next_state = LMR0; end else if(susp_req_r & !wb_cycle) begin cs_le_d = 1'b1; susp_sel_set = 1'b1; next_state = SUSP1; end else if(cs_a & (wb_read_go | wb_write_go) & lookup_ready2) begin wb_cycle_set = 1'b1; case(mem_type) // synopsys full_case parallel_case `MC_MEM_TYPE_SDRAM: // SDRAM if((lookup_ready2) & !wb_wait) begin if(wb_write_go | (wb_we_i & wb_stb_i)) wr_set = 1'b1; if(kro & bank_open & row_same) next_state = SD_RD_WR; else if(kro & bank_open) next_state = PRECHARGE; else next_state = ACTIVATE; end `MC_MEM_TYPE_ACS: begin // Async Chip Select if(!wb_wait) begin cs_le_d = 1'b1; if(wb_write_go) begin data_oe_d = 1'b1; next_state = ACS_WR; end else next_state = ACS_RD; end end `MC_MEM_TYPE_SCS: begin // Sync Chip Select if(!wb_wait) begin cs_le_d = 1'b1; if(wb_write_go) begin cmd = `MC_CMD_XWR; data_oe_d = 1'b1; tmr_ld_twr2 = 1'b1; next_state = SCS_WR; end else begin cmd = `MC_CMD_XRD; oe_d = 1'b1; tmr_ld_trdv = 1'b1; next_state = SCS_RD; end end end `MC_MEM_TYPE_SRAM: begin // SRAM if(!wb_wait) begin cs_le_d = 1'b1; if(wb_write_go) begin data_oe_d = 1'b1; mem_ack_d = 1'b1; next_state = SRAM_WR; end else begin cmd = `MC_CMD_XRD; oe_d = 1'b1; mc_adsc = 1'b1; next_state = SRAM_RD; end end end endcase end else if(mc_br) begin if(!cmd_asserted2) begin next_state = BG0; mc_c_oe_d = 1'b0; end end end IDLE_T: begin cmd_a10 = cmd_a10_r; // Hold Auto Precharge 'til cycle finishes if(tmr_done & wb_cycle & !wb_wait) cs_le_d = 1'b1; if(tmr_done) next_state = IDLE; end IDLE_T2: begin if(tmr2_done & (!wb_wait | !wb_cycle) ) begin //cs_le_d = 1'b1; //if(cs_le_r) next_state = IDLE; cs_le_d = wb_stb_i; if(cs_le_r | !wb_stb_i) next_state = IDLE; end end ///////////////////////////////////////// // SCS STATES .... ///////////////////////////////////////// SCS_RD: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; tmr_ld_trdv = 1'b1; if(mc_ack) next_state = SCS_RD1; else if(tmr2_done) next_state = SCS_ERR; end SCS_RD1: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; if(tmr_done) begin mem_ack_d = 1'b1; tmr_ld_trdz = 1'b1; next_state = SCS_RD2; end end SCS_RD2: begin tmr_ld_trdz = 1'b1; next_state = IDLE_T; end SCS_WR: begin tmr_ld_twr2 = 1'b1; cmd = `MC_CMD_XWR; data_oe_d = 1'b1; if(mc_ack) next_state = SCS_WR1; else if(tmr2_done) next_state = SCS_ERR; end SCS_WR1: begin data_oe_d = 1'b1; if(tmr_done) begin mem_ack_d = 1'b1; next_state = IDLE_T; end else cmd = `MC_CMD_XWR; end SCS_ERR: begin mem_ack_d = 1'b1; err_d = 1'b1; next_state = IDLE_T2; end ///////////////////////////////////////// // SSRAM STATES .... ///////////////////////////////////////// SRAM_RD: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; mc_adsc = 1'b1; tmr2_ld_tsrdv = 1'b1; burst_cnt_ld_4 = 1'b1; if(cmd_asserted) next_state = SRAM_RD0; end SRAM_RD0: begin mc_adv = 1'b1; oe_d = 1'b1; if(tmr2_done) begin mc_adv = !wb_wait; next_state = SRAM_RD1; end end SRAM_RD1: begin if(mc_adv_r) dv = ~dv_r; mc_adv = !wb_wait; if(!burst_act | !wb_read_go) next_state = SRAM_RD2; else oe_d = 1'b1; end SRAM_RD2: begin if(ack_cnt_is_0 & wb_read_go) next_state = SRAM_RD3; else if(!wb_read_go) begin mc_adsc = 1'b1; next_state = SRAM_RD4; end end SRAM_RD3: begin if(!wb_read_go) begin mc_adsc = 1'b1; next_state = SRAM_RD4; end else if(!wb_wait) begin cs_le_d = 1'b1; next_state = SRAM_RD; end end SRAM_RD4: // DESELECT begin mc_adsc = 1'b1; next_state = IDLE; end SRAM_WR: begin cmd = `MC_CMD_XWR; mc_adsc = 1'b1; data_oe_d = 1'b1; if(cmd_asserted) begin if(wb_wait) next_state = SRAM_WR0; else if(!wb_write_go) begin mc_adsc = 1'b1; next_state = SRAM_RD4; end else begin data_oe_d = 1'b1; mem_ack_d = ~mem_ack_r; end end end SRAM_WR0: begin if(wb_wait) next_state = SRAM_WR0; else if(!wb_write_go) begin mc_adsc = 1'b1; next_state = SRAM_RD4; end else begin data_oe_d = 1'b1; next_state = SRAM_WR; end end ///////////////////////////////////////// // Async Devices STATES .... ///////////////////////////////////////// ACS_RD: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; tmr2_ld_trdv = 1'b1; next_state = ACS_RD1; end ACS_RD1: begin // 32 bit, 8 bit - first; 16 bit - first cmd = `MC_CMD_XRD; oe_d = 1'b1; if(tmr2_done) begin if(bw8 | bw16) next_adr = 1'b1; if(bw8) next_state = ACS_RD_8_1; else if(bw16) next_state = ACS_RD_8_5; else next_state = ACS_RD2A; end end ACS_RD_8_1: begin // 8 bit 2nd byte pack_le0_d = 1'b1; cmd = `MC_CMD_XRD; oe_d = 1'b1; tmr2_ld_trdv = 1'b1; next_state = ACS_RD_8_2; end ACS_RD_8_2: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; if(tmr2_done) begin next_adr = 1'b1; next_state = ACS_RD_8_3; end end ACS_RD_8_3: begin // 8 bit 3rd byte pack_le1_d = 1'b1; cmd = `MC_CMD_XRD; oe_d = 1'b1; tmr2_ld_trdv = 1'b1; next_state = ACS_RD_8_4; end ACS_RD_8_4: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; if(tmr2_done) begin next_adr = 1'b1; next_state = ACS_RD_8_5; end end ACS_RD_8_5: begin // 8 bit 4th byte; 16 bit 2nd word if(bw8) pack_le2_d = 1'b1; if(bw16) pack_le0_d = 1'b1; cmd = `MC_CMD_XRD; oe_d = 1'b1; tmr2_ld_trdv = 1'b1; next_state = ACS_RD_8_6; end ACS_RD_8_6: begin cmd = `MC_CMD_XRD; oe_d = 1'b1; if(tmr2_done) begin next_state = ACS_RD2; end end ACS_RD2A: begin oe_d = 1'b1; cmd = `MC_CMD_XRD; next_state = ACS_RD2; end ACS_RD2: begin cmd = `MC_CMD_XRD; next_state = ACS_RD3; end ACS_RD3: begin mem_ack_d = 1'b1; tmr2_ld_trdz = 1'b1; next_state = IDLE_T2; end ACS_WR: begin tmr2_ld_twpw = 1'b1; cmd = `MC_CMD_XWR; data_oe_d = 1'b1; next_state = ACS_WR1; end ACS_WR1: begin if(!cmd_asserted) tmr2_ld_twpw = 1'b1; cmd = `MC_CMD_XWR; data_oe_d = 1'b1; if(tmr2_done) begin tmr2_ld_twd = 1'b1; next_state = ACS_WR2; end end ACS_WR2: begin if(twd_is_zero) next_state = ACS_WR3; else begin cmd = `MC_CMD_XRD; data_oe_d = 1'b1; next_state = ACS_WR3; end end ACS_WR3: begin if(tmr2_done) next_state = ACS_WR4; else cmd = `MC_CMD_XRD; end ACS_WR4: begin tmr2_ld_twwd = 1'b1; mem_ack_d = 1'b1; next_state = IDLE_T2; end ///////////////////////////////////////// // SDRAM STATES .... ///////////////////////////////////////// PRECHARGE: begin cmd = `MC_CMD_PC; if(rfr_ack_r) begin rfr_ack_d = 1'b1; cmd_a10 = `MC_ALL_BANKS; bank_clr_all = 1'b1; end else begin bank_clr = 1'b1; cmd_a10 = `MC_SINGLE_BANK; end tmr_ld_trp = 1'b1; if(cmd_asserted) next_state = PRECHARGE_W; end PRECHARGE_W: begin rfr_ack_d = rfr_ack_r; if(tmr_done) begin if(rfr_ack_r) next_state = REFR; else next_state = ACTIVATE; end end ACTIVATE: begin if(!wb_wait_r) begin row_sel = 1'b1; tmr_ld_trcd = 1'b1; cmd = `MC_CMD_ACT; end if(cmd_asserted) next_state = ACTIVATE_W; end ACTIVATE_W: begin row_sel = 1'b1; if(wb_write_go | (wb_we_i & wb_stb_i)) wr_set = 1'b1; if(kro) bank_set = 1'b1; if(tmr_done) begin if(wb_write_go) begin mem_ack_d = ~mem_ack_r; cmd_a10 = ap_en | (single_write & !kro); next_state = SD_WR; end else if(!wb_wait_r) next_state = SD_RD; end end SD_RD_WR: begin if(wb_write_go | (wb_we_i & wb_stb_i)) wr_set = 1'b1; if(wb_write_go & !wb_wait) begin // Write data_oe_d = 1'b1; mem_ack_d = ~mem_ack_r; cmd_a10 = ap_en | (single_write & !kro); next_state = SD_WR; end else if(!wb_wait) begin // Read if(kro) begin if(!wb_wait_r) next_state = SD_RD; end else next_state = SD_RD; end end SD_WR: // Write Command begin // Does the first single write data_oe_d = 1'b1; tmr_ld_twr = 1'b1; cnt_next = ~cnt; cmd = `MC_CMD_WR; cmd_a10 = ap_en | (single_write & !kro); if(!cnt & wb_cycle & burst_act) cke_d = ~wb_wait; else cke_d = cke_r; if(cmd_asserted) begin mem_ack_d = !mem_ack_r & wb_write_go & !wb_wait & wb_cycle & burst_act; if(wb_cycle & !burst_act) next_state = IDLE_T; else if(wb_write_go) next_state = SD_WR_W; else if(burst_act & !single_write) next_state = BT; else if(!ap_en) next_state = BT_W; else next_state = IDLE_T; end end SD_WR_W: begin // Does additional Writes or Times them tmr_ld_twr = 1'b1; cnt_next = ~cnt; if(single_write & wb_cycle) begin cmd = `MC_CMD_WR; end cmd_a10 = ap_en | (single_write & !kro); data_oe_d = 1'b1; mem_ack_d = !mem_ack_r & wb_write_go & !wb_wait & wr_cycle & burst_act; if(!cnt) cke_d = ~wb_wait; else cke_d = cke_r; if( (single_write & cke_r) | (!single_write & !cnt & !wb_wait) | (!single_write & cnt & cke_r) ) begin if(single_write & !wb_cycle) next_state = IDLE_T; else if(burst_act & !single_write & !wb_write_go_r) begin cmd = `MC_CMD_BT; next_state = BT; end else if(!burst_act & !ap_en) next_state = BT_W; else if(!burst_act) next_state = IDLE_T; else if(!wb_write_go_r & wb_read_go) next_state = IDLE_T; // Added for WMR end end SD_RD: // Read Command begin cmd = `MC_CMD_RD; cmd_a10 = ap_en; tmr_ld_tcl = 1'b1; if(cmd_asserted) next_state = SD_RD_W; end SD_RD_W: begin if(tmr_done) next_state = SD_RD_LOOP; end SD_RD_LOOP: begin cnt_next = ~cnt; if(cnt & !(burst_act & !wb_cycle) & burst_act ) cke_rd = !wb_wait; else cke_rd = cke_; if(wb_cycle & !cnt & burst_act_rd & cke_o_del) dv = 1'b1; if(wb_cycle & wb_write_go) next_state = BT; else if(burst_act & !wb_cycle) next_state = BT; else if(!burst_act) next_state = SD_RD_W2; end SD_RD_W2: begin if(wb_write_go | ack_cnt_is_0) begin if(!ap_en & !kro) next_state = BT_W; else if(!wb_wait & !mem_ack_r) next_state = IDLE_T; end end BT: begin cmd = `MC_CMD_BT; tmr_ld_trp = 1'b1; if(cmd_asserted) next_state = BT_W; end BT_W: begin cmd_a10 = cmd_a10_r; // Hold Auto Precharge 'til cycle finishes if(kro & tmr_done) begin if(kro & !wb_wait & (wb_read_go | wb_write_go) ) cs_le_d = 1'b1; next_state = IDLE; end else if(!kro & tmr_done) // Must do a PRECHARGE after Burst Terminate begin bank_clr = 1'b1; cmd = `MC_CMD_PC; cmd_a10 = `MC_SINGLE_BANK; tmr_ld_trp = 1'b1; if(cmd_asserted) next_state = IDLE_T; end end REFR: // Refresh Cycle begin cs_le_d = 1'b1; cmd = `MC_CMD_ARFR; tmr_ld_trfc = 1'b1; rfr_ack_d = 1'b1; if(cmd_asserted) begin susp_sel_clr = 1'b1; next_state = IDLE_T; end end LMR0: begin lmr_ack_d = 1'b1; cmd = `MC_CMD_PC; cmd_a10 = `MC_ALL_BANKS; bank_clr_all = 1'b1; tmr_ld_trp = 1'b1; if(cmd_asserted) next_state = LMR1; end LMR1: begin lmr_ack_d = 1'b1; if(tmr_done) next_state = LMR2; end LMR2: begin bank_clr_all = 1'b1; cmd = `MC_CMD_LMR; tmr_ld_trfc = 1'b1; lmr_ack_d = 1'b1; if(cmd_asserted) next_state = IDLE_T; end INIT0: begin cs_le_d = 1'b1; next_state = INIT; end INIT: // Initialize SDRAMS begin // PRECHARGE init_ack = 1'b1; cmd = `MC_CMD_PC; cmd_a10 = `MC_ALL_BANKS; bank_clr_all = 1'b1; tmr_ld_trp = 1'b1; ir_cnt_ld = 1'b1; if(cmd_asserted) next_state = INIT_W; end INIT_W: begin init_ack = 1'b1; if(tmr_done) next_state = INIT_REFR1; end INIT_REFR1: // Init Refresh Cycle 1 begin init_ack = 1'b1; cmd = `MC_CMD_ARFR; tmr_ld_trfc = 1'b1; if(cmd_asserted) begin ir_cnt_dec = 1'b1; next_state = INIT_REFR1_W; end end INIT_REFR1_W: begin init_ack = 1'b1; if(tmr_done) begin if(ir_cnt_done) next_state = INIT_LMR; else next_state = INIT_REFR1; end end INIT_LMR: begin init_ack = 1'b1; cmd = `MC_CMD_LMR; bank_clr_all = 1'b1; tmr_ld_trfc = 1'b1; if(cmd_asserted) next_state = IDLE_T; end ///////////////////////////////////////// // Bus Arbitration STATES .... ///////////////////////////////////////// BG0: begin // Bus Grant mc_bg = 1'b1; mc_c_oe_d = 1'b0; next_state = BG1; end BG1: begin // Bus Grant mc_bg = 1'b1; cs_le_d = 1'b1; mc_c_oe_d = 1'b0; next_state = BG2; end BG2: begin // Bus Grant cs_le_d = 1'b1; mc_bg = !wb_read_go & !wb_write_go & !rfr_req & !init_req & !lmr_req & !susp_req_r; tmr_ld_tavav = 1'b1; mc_c_oe_d = mc_br; if(!mc_br) next_state = IDLE_T; end ///////////////////////////////////////// // SUSPEND/RESUME STATES .... ///////////////////////////////////////// SUSP1: begin // Precharge All cmd = `MC_CMD_PC; cmd_a10 = `MC_ALL_BANKS; bank_clr_all = 1'b1; tmr_ld_trp = 1'b1; if(cmd_asserted) next_state = SUSP2; end SUSP2: begin if(tmr_done) next_state = SUSP3; end SUSP3: begin // Enter Self refresh Mode cke_d = 1'b0; cmd = `MC_CMD_ARFR; rfr_ack_d = 1'b1; if(cmd_asserted) begin next_state = SUSP4; end end SUSP4: begin // Now we are suspended cke_rd = 1'b0; suspended_d = 1'b1; tmr_ld_txsr = 1'b1; if(resume_req_r) next_state = RESUME1; end RESUME1: begin suspended_d = 1'b1; tmr_ld_txsr = 1'b1; next_state = RESUME2; end RESUME2: begin suspended_d = 1'b1; if(tmr_done) next_state = REFR; end // synopsys translate_off default: $display("MC_TIMING SM: Entered non existing state ... (%t)",$time); // synopsys translate_on endcase end endmodule
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