| /***************************************************************************** |
| * McPAT/CACTI |
| * SOFTWARE LICENSE AGREEMENT |
| * Copyright 2012 Hewlett-Packard Development Company, L.P. |
| * Copyright (c) 2010-2013 Advanced Micro Devices, Inc. |
| * All Rights Reserved |
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| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| ***************************************************************************/ |
| |
| |
| |
| |
| #include <cassert> |
| #include <cmath> |
| #include <iostream> |
| |
| #include "subarray.h" |
| |
| Subarray::Subarray(const DynamicParameter & dp_, bool is_fa_): |
| dp(dp_), num_rows(dp.num_r_subarray), num_cols(dp.num_c_subarray), |
| num_cols_fa_cam(dp.tag_num_c_subarray), num_cols_fa_ram(dp.data_num_c_subarray), |
| cell(dp.cell), cam_cell(dp.cam_cell), is_fa(is_fa_) { |
| //num_cols=7; |
| //cout<<"num_cols ="<< num_cols <<endl; |
| if (!(is_fa || dp.pure_cam)) { |
| // ECC overhead |
| num_cols += (g_ip->add_ecc_b_ ? (int)ceil(num_cols / |
| num_bits_per_ecc_b_) : 0); |
| uint32_t ram_num_cells_wl_stitching = |
| (dp.ram_cell_tech_type == lp_dram) ? dram_num_cells_wl_stitching_ : |
| (dp.ram_cell_tech_type == comm_dram) ? comm_dram_num_cells_wl_stitching_ : sram_num_cells_wl_stitching_; |
| |
| area.h = cell.h * num_rows; |
| |
| area.w = cell.w * num_cols + |
| ceil(num_cols / ram_num_cells_wl_stitching) * g_tp.ram_wl_stitching_overhead_; // stitching overhead |
| } else { //cam fa |
| |
| //should not add dummy row here since the dummy row do not need decoder |
| if (is_fa) { // fully associative cache |
| num_cols_fa_cam += g_ip->add_ecc_b_ ? (int)ceil(num_cols_fa_cam / num_bits_per_ecc_b_) : 0; |
| num_cols_fa_ram += (g_ip->add_ecc_b_ ? (int)ceil(num_cols_fa_ram / num_bits_per_ecc_b_) : 0); |
| num_cols = num_cols_fa_cam + num_cols_fa_ram; |
| } else { |
| num_cols_fa_cam += g_ip->add_ecc_b_ ? (int)ceil(num_cols_fa_cam / num_bits_per_ecc_b_) : 0; |
| num_cols_fa_ram = 0; |
| num_cols = num_cols_fa_cam; |
| } |
| |
| area.h = cam_cell.h * (num_rows + 1);//height of subarray is decided by CAM array. blank space in sram array are filled with dummy cells |
| area.w = cam_cell.w * num_cols_fa_cam + cell.w * num_cols_fa_ram |
| + ceil((num_cols_fa_cam + num_cols_fa_ram) / |
| sram_num_cells_wl_stitching_) * |
| g_tp.ram_wl_stitching_overhead_ |
| //the overhead for the NAND gate to connect the two halves |
| + 16 * g_tp.wire_local.pitch |
| //the overhead for the drivers from matchline to wordline of RAM |
| + 128 * g_tp.wire_local.pitch; |
| } |
| |
| assert(area.h > 0); |
| assert(area.w > 0); |
| compute_C(); |
| } |
| |
| |
| |
| Subarray::~Subarray() { |
| } |
| |
| |
| |
| double Subarray::get_total_cell_area() { |
| // return (is_fa==false? cell.get_area() * num_rows * num_cols |
| // //: cam_cell.h*(num_rows+1)*(num_cols_fa_cam + sram_cell.get_area()*num_cols_fa_ram)); |
| // : cam_cell.get_area()*(num_rows+1)*(num_cols_fa_cam + num_cols_fa_ram)); |
| // //: cam_cell.get_area()*(num_rows+1)*num_cols_fa_cam + sram_cell.get_area()*(num_rows+1)*num_cols_fa_ram);//for FA, this area does not include the dummy cells in SRAM arrays. |
| |
| if (!(is_fa || dp.pure_cam)) |
| return (cell.get_area() * num_rows * num_cols); |
| else if (is_fa) { |
| //for FA, this area includes the dummy cells in SRAM arrays. |
| //return (cam_cell.get_area()*(num_rows+1)*(num_cols_fa_cam + num_cols_fa_ram)); |
| //cout<<"diff" <<cam_cell.get_area()*(num_rows+1)*(num_cols_fa_cam + num_cols_fa_ram)- cam_cell.h*(num_rows+1)*(cam_cell.w*num_cols_fa_cam + cell.w*num_cols_fa_ram)<<endl; |
| return (cam_cell.h * (num_rows + 1) * |
| (cam_cell.w*num_cols_fa_cam + cell.w*num_cols_fa_ram)); |
| } else { |
| return (cam_cell.get_area() * (num_rows + 1) * num_cols_fa_cam ); |
| } |
| |
| |
| } |
| |
| |
| |
| void Subarray::compute_C() { |
| double c_w_metal = cell.w * g_tp.wire_local.C_per_um; |
| double r_w_metal = cell.w * g_tp.wire_local.R_per_um; |
| double C_b_metal = cell.h * g_tp.wire_local.C_per_um; |
| double C_b_row_drain_C; |
| |
| if (dp.is_dram) { |
| C_wl = (gate_C_pass(g_tp.dram.cell_a_w, g_tp.dram.b_w, true, true) + c_w_metal) * num_cols; |
| |
| if (dp.ram_cell_tech_type == comm_dram) { |
| C_bl = num_rows * C_b_metal; |
| } else { |
| C_b_row_drain_C = drain_C_(g_tp.dram.cell_a_w, NCH, 1, 0, cell.w, true, true) / 2.0; // due to shared contact |
| C_bl = num_rows * (C_b_row_drain_C + C_b_metal); |
| } |
| } else { |
| if (!(is_fa || dp.pure_cam)) { |
| C_wl = (gate_C_pass(g_tp.sram.cell_a_w, |
| (g_tp.sram.b_w - 2 * g_tp.sram.cell_a_w) / 2.0, |
| false, true) * 2 + |
| c_w_metal) * num_cols; |
| C_b_row_drain_C = drain_C_(g_tp.sram.cell_a_w, NCH, 1, 0, cell.w, false, true) / 2.0; // due to shared contact |
| C_bl = num_rows * (C_b_row_drain_C + C_b_metal); |
| } else { |
| //Following is wordline not matchline |
| //CAM portion |
| c_w_metal = cam_cell.w * g_tp.wire_local.C_per_um; |
| r_w_metal = cam_cell.w * g_tp.wire_local.R_per_um; |
| C_wl_cam = (gate_C_pass(g_tp.cam.cell_a_w, |
| (g_tp.cam.b_w - 2 * g_tp.cam.cell_a_w) / |
| 2.0, false, true) * 2 + |
| c_w_metal) * num_cols_fa_cam; |
| R_wl_cam = (r_w_metal) * num_cols_fa_cam; |
| |
| if (!dp.pure_cam) { |
| //RAM portion |
| c_w_metal = cell.w * g_tp.wire_local.C_per_um; |
| r_w_metal = cell.w * g_tp.wire_local.R_per_um; |
| C_wl_ram = (gate_C_pass(g_tp.sram.cell_a_w, |
| (g_tp.sram.b_w - 2 * |
| g_tp.sram.cell_a_w) / 2.0, false, |
| true) * 2 + |
| c_w_metal) * num_cols_fa_ram; |
| R_wl_ram = (r_w_metal) * num_cols_fa_ram; |
| } else { |
| C_wl_ram = R_wl_ram = 0; |
| } |
| C_wl = C_wl_cam + C_wl_ram; |
| C_wl += (16 + 128) * g_tp.wire_local.pitch * |
| g_tp.wire_local.C_per_um; |
| |
| R_wl = R_wl_cam + R_wl_ram; |
| R_wl += (16 + 128) * g_tp.wire_local.pitch * |
| g_tp.wire_local.R_per_um; |
| |
| //there are two ways to write to a FA, |
| //1) Write to CAM array then force a match on match line to active the corresponding wordline in RAM; |
| //2) using separate wordline for read/write and search in RAM. |
| //We are using the second approach. |
| |
| //Bitline CAM portion This is bitline not searchline. We assume no sharing between bitline and searchline according to SUN's implementations. |
| C_b_metal = cam_cell.h * g_tp.wire_local.C_per_um; |
| C_b_row_drain_C = drain_C_(g_tp.cam.cell_a_w, NCH, 1, 0, cam_cell.w, false, true) / 2.0; // due to shared contact |
| C_bl_cam = (num_rows + 1) * (C_b_row_drain_C + C_b_metal); |
| //height of subarray is decided by CAM array. blank space in sram array are filled with dummy cells |
| C_b_row_drain_C = drain_C_(g_tp.sram.cell_a_w, NCH, 1, 0, cell.w, false, true) / 2.0; // due to shared contact |
| C_bl = (num_rows + 1) * (C_b_row_drain_C + C_b_metal); |
| |
| } |
| } |
| } |
| |
| |
