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Diffstat (limited to 'ext/mcpat/cacti/subarray.cc')
| -rwxr-xr-x | ext/mcpat/cacti/subarray.cc | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/ext/mcpat/cacti/subarray.cc b/ext/mcpat/cacti/subarray.cc new file mode 100755 index 000000000..7cbf7d990 --- /dev/null +++ b/ext/mcpat/cacti/subarray.cc @@ -0,0 +1,196 @@ +/***************************************************************************** + * McPAT/CACTI + * SOFTWARE LICENSE AGREEMENT + * Copyright 2012 Hewlett-Packard Development Company, L.P. + * All Rights Reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER 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.” + * + ***************************************************************************/ + + + + +#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)) + { + num_cols +=(g_ip->add_ecc_b_ ? (int)ceil(num_cols / num_bits_per_ecc_b_) : 0); // ECC overhead + 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_ + + 16*g_tp.wire_local.pitch //the overhead for the NAND gate to connect the two halves + + 128*g_tp.wire_local.pitch;//the overhead for the drivers from matchline to wordline of RAM + } + + 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); + + } + } +} + + |