320 lines
8.7 KiB
C
320 lines
8.7 KiB
C
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/*********************************************************************
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* The following code is part of the power modelling feature of VTR.
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*
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* For support:
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* http://code.google.com/p/vtr-verilog-to-routing/wiki/Power
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*
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* or email:
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* vtr.power.estimation@gmail.com
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*
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* If you are using power estimation for your researach please cite:
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*
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* Jeffrey Goeders and Steven Wilton. VersaPower: Power Estimation
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* for Diverse FPGA Architectures. In International Conference on
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* Field Programmable Technology, 2012.
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*
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********************************************************************/
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/**
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* This is the top-level file for power estimation in VTR
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*/
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#ifndef __POWER_H__
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#define __POWER_H__
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/************************* INCLUDES *********************************/
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#include <list>
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#include "vpr_types.h"
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#include "PowerSpicedComponent.h"
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/************************* DEFINES ***********************************/
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/* Maximum size of logs */
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#define MAX_LOGS 10000
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/* Default clock behaviour */
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#define CLOCK_PROB 0.5
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#define CLOCK_DENS 2
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/************************* ENUMS ************************************/
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/* Return code used by power functions */
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typedef enum {
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POWER_RET_CODE_SUCCESS = 0, POWER_RET_CODE_ERRORS, POWER_RET_CODE_WARNINGS
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} e_power_ret_code;
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/* Power log types */
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typedef enum {
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POWER_LOG_ERROR, POWER_LOG_WARNING, POWER_LOG_NUM_TYPES
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} e_power_log_type;
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/* Multiplexer select encoding types */
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#if 0
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typedef enum {
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ENCODING_ONE_HOT, /* One SRAM bit per mux input */
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ENCODING_DECODER /* Log2(mux_inputs) SRAM bits */
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}e_encoding_type;
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#endif
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/************************* STRUCTS **********************************/
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typedef struct s_power_output t_power_output;
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typedef struct s_log t_log;
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typedef struct s_power_commonly_used t_power_commonly_used;
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typedef struct s_power_mux_volt_inf t_power_mux_volt_inf;
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typedef struct s_power_mux_volt_pair t_power_mux_volt_pair;
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typedef struct s_power_nmos_leakages t_power_nmos_leakages;
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typedef struct s_power_nmos_leakage_pair t_power_nmos_leakage_pair;
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typedef struct s_power_buffer_sc_levr_inf t_power_buffer_sc_levr_inf;
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typedef struct s_power_tech t_power_tech;
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typedef struct s_transistor_inf t_transistor_inf;
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typedef struct s_transistor_size_inf t_transistor_size_inf;
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typedef struct s_rr_node_power t_rr_node_power;
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typedef struct s_power_buffer_size_inf t_power_buffer_size_inf;
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typedef struct s_power_buffer_strength_inf t_power_buffer_strength_inf;
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typedef struct s_mux_node t_mux_node;
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typedef struct s_mux_arch t_mux_arch;
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typedef struct s_solution_inf t_solution_inf;
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typedef struct s_power_nmos_mux_inf t_power_nmos_mux_inf;
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typedef struct s_power_nmos_leakage_inf t_power_nmos_leakage_inf;
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typedef struct s_power_mux_info t_power_mux_info;
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/* Information on the solution obtained by VPR */
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struct s_solution_inf {
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float T_crit;
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int channel_width;
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};
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/* two types of transisters */
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typedef enum {
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NMOS, PMOS
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} e_tx_type;
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/* Information for a given transistor size */
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struct s_transistor_size_inf {
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float size;
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/* Subthreshold leakage, for Vds = Vdd */
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float leakage_subthreshold;
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/* Gate leakage for Vgd/Vgs = Vdd */
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float leakage_gate;
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/* Gate, Source, Drain capacitance */
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float C_g;
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float C_s;
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float C_d;
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};
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/**
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* Transistor information
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*/
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struct s_transistor_inf {
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int num_size_entries;
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t_transistor_size_inf * size_inf; /* Array of transistor sizes */
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t_transistor_size_inf * long_trans_inf; /* Long transistor (W=1,L=2) */
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};
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struct s_power_nmos_mux_inf {
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float nmos_size;
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int max_mux_sl_size;
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t_power_mux_volt_inf * mux_voltage_inf;
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};
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struct s_power_nmos_leakage_inf {
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float nmos_size;
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int num_leakage_pairs;
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t_power_nmos_leakage_pair * leakage_pairs;
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};
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/* CMOS technology properties, populated from data in xml file */
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struct s_power_tech {
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float PN_ratio; /* Ratio of PMOS to NMOS in inverter */
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float Vdd;
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float tech_size; /* Tech size in nm, for example 90e-9 for 90nm */
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float temperature; /* Temp in C */
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t_transistor_inf NMOS_inf;
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t_transistor_inf PMOS_inf;
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/* Pass Multiplexor Voltage Information */
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int num_nmos_mux_info;
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t_power_nmos_mux_inf * nmos_mux_info;
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/* NMOS Leakage by Vds */
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int num_nmos_leakage_info;
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t_power_nmos_leakage_inf * nmos_leakage_info;
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/* Buffer Info */
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int max_buffer_size;
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t_power_buffer_size_inf * buffer_size_inf;
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};
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/* Buffer information for a given size (# of stages) */
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struct s_power_buffer_size_inf {
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int num_strengths;
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t_power_buffer_strength_inf * strength_inf;
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};
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/* Set of I/O Voltages for a single-level multiplexer */
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struct s_power_mux_volt_inf {
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int num_voltage_pairs;
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t_power_mux_volt_pair * mux_voltage_pairs;
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};
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/* Single I/O voltage for a single-level multiplexer */
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struct s_power_mux_volt_pair {
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float v_in;
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float v_out_min;
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float v_out_max;
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};
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/* Buffer information for a given buffer stength */
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struct s_power_buffer_strength_inf {
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float stage_gain;
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/* Short circuit factor - no level restorer */
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float sc_no_levr;
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/* Short circuit factors - level restorers */
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int num_levr_entries;
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t_power_buffer_sc_levr_inf * sc_levr_inf;
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};
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/* Buffer short-circuit information for a given input mux size */
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struct s_power_buffer_sc_levr_inf {
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int mux_size;
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/* Short circuit factor */
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float sc_levr;
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};
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/* Vds/Ids subthreshold leakage pair */
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struct s_power_nmos_leakage_pair {
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float v_ds;
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float i_ds;
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};
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/* Output details of the power estimation */
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struct s_power_output {
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FILE * out;
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t_log * logs;
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int num_logs;
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};
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struct s_log {
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char * name;
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char ** messages;
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int num_messages;
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};
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struct s_power_mux_info {
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/* Mux architecture information for 0..mux_arch_max_size */
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int mux_arch_max_size;
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t_mux_arch * mux_arch;
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};
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/**
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* Commonly used values that are cached here instead of recalculting each time,
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* also includes statistics.
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*/
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struct s_power_commonly_used {
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/* Capacitances */
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float NMOS_1X_C_g;
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float NMOS_1X_C_d;
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float NMOS_1X_C_s;
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float PMOS_1X_C_g;
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float PMOS_1X_C_d;
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float PMOS_1X_C_s;
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float INV_1X_C_in;
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float INV_1X_C;
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float INV_2X_C;
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/* Component Callibrations Array [0..POWER_CALLIB_COMPONENT_MAX-1] */
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PowerSpicedComponent ** component_callibration;
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/* Subthreshold leakages */
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float NMOS_1X_st_leakage;
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float NMOS_2X_st_leakage;
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float PMOS_1X_st_leakage;
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float PMOS_2X_st_leakage;
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std::map<float, t_power_mux_info*> mux_info;
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/* Routing stats */
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int max_routing_mux_size;
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int max_IPIN_fanin;
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int max_seg_fanout;
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int max_seg_to_IPIN_fanout;
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int max_seg_to_seg_fanout;
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/* Physical length of a tile (meters) */
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float tile_length;
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/* Size of switch and connection box buffers */
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int num_sb_buffers;
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float total_sb_buffer_size;
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int num_cb_buffers;
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float total_cb_buffer_size;
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};
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/* 1-to-1 data structure with t_rr_node
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*/
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struct s_rr_node_power {
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boolean visited; /* When traversing netlist, need to track whether the node has been processed */
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float * in_dens; /* Switching density of inputs */
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float * in_prob; /* Static probability of inputs */
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short num_inputs; /* Number of inputs */
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short selected_input; /* Input index that is selected */
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short driver_switch_type; /* Switch type that drives this resource */
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};
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/* Architecture information for a multiplexer.
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* This is used to specify transistor sizes, encoding, etc.
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*/
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struct s_mux_arch {
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int levels;
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int num_inputs;
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float transistor_size;
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//enum e_encoding_type * encoding_types;
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t_mux_node * mux_graph_head;
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};
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/* A single-level multiplexer data structure.
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* These are combined in a hierarchy to represent
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* multi-level multiplexers
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*/
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struct s_mux_node {
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int num_inputs; /* Number of inputs */
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t_mux_node * children; /* Multiplexers that drive the inputs [0..num_inputs-1] */
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int starting_pin_idx; /* Applicable to level 0 only, the overall mux primary input index */
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int level; /* Level in the full multilevel mux - 0 = primary inputs to mux */
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boolean level_restorer; /* Whether the output of this mux is level restored */
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};
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/************************* GLOBALS **********************************/
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extern t_solution_inf g_solution_inf;
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extern t_power_output * g_power_output;
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extern t_power_commonly_used * g_power_commonly_used;
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extern t_power_tech * g_power_tech;
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extern t_power_arch * g_power_arch;
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/************************* FUNCTION DECLARATIONS ********************/
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/* Call before using power module */
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boolean power_init(char * power_out_filepath,
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char * cmos_tech_behavior_filepath, t_arch * arch,
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t_det_routing_arch * routing_arch);
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boolean power_uninit(void);
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/* Top-Level Function */
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e_power_ret_code power_total(float * run_time_s, t_vpr_setup vpr_setup,
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t_arch * arch, t_det_routing_arch * routing_arch);
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#endif /* __POWER_H__ */
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