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287 lines
11 KiB
Python
287 lines
11 KiB
Python
#!/usr/bin/env python3
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"""
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Physical Topology Optimizer
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Optimizes FPGA design using complete physical topology including capacitors, wires, USB lines, voltage, etc.
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"""
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import json
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from pathlib import Path
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from typing import Dict, List, Optional
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# Paths
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OUTPUT_DIR = Path("/home/allaun/Documents/Research Stack/out")
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class PhysicalTopologyOptimizer:
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"""Optimizes FPGA using complete physical topology."""
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def __init__(self):
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self.physical_topology = {
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"capacitors": {
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"decoupling": {
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"fpga_power_rails": ["0.1uF", "1uF", "10uF"],
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"ftdi_power_rails": ["0.1uF", "1uF"],
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"voltage_regulator": ["10uF", "100uF"]
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},
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"filtering": {
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"usb_differential_pairs": ["0.01uF"],
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"clock_lines": ["0.1uF"],
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"reset_lines": ["0.01uF"]
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},
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"bulk": {
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"power_supply": ["470uF", "1000uF"]
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}
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},
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"wires": {
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"pcb_traces": {
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"fpga_ftdi": {
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"length": "5-10cm",
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"impedance": "50 ohms",
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"material": "FR4"
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},
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"usb_lines": {
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"d_plus": "90 ohms differential",
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"d_minus": "90 ohms differential",
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"length": "10-20cm"
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},
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"power_rails": {
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"3.3V": "0.1 ohms",
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"1.8V": "0.1 ohms",
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"gnd": "0.01 ohms"
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}
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},
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"usb_cable": {
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"d_plus": "90 ohms differential",
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"d_minus": "90 ohms differential",
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"vbus": "0.5 ohms",
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"length": "1-3m"
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}
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},
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"usb_lines": {
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"differential_pairs": {
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"d_plus_d_minus": "90 ohms",
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"impedance_tolerance": "±15%",
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"skew": "<100ps"
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},
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"vbus": {
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"voltage": "5V ±5%",
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"current": "500mA max",
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"impedance": "<1 ohm"
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}
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},
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"voltage": {
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"power_rails": {
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"fpga": {
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"core": "1.8V",
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"io": "3.3V",
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"aux": "2.5V"
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},
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"ftdi": {
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"core": "1.8V",
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"io": "3.3V"
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},
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"usb": {
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"vbus": "5V"
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}
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},
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"regulators": {
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"ldo_3.3V": "5V → 3.3V",
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"ldo_1.8V": "3.3V → 1.8V",
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"efficiency": "85-90%"
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}
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},
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"thermal": {
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"fpga": {
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"max_junction_temp": "85°C",
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"thermal_resistance": "40°C/W",
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"power_dissipation": "<1W"
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},
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"ftdi": {
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"max_junction_temp": "70°C",
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"thermal_resistance": "50°C/W",
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"power_dissipation": "<0.5W"
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}
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},
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"signal_integrity": {
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"rise_time": "<5ns",
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"fall_time": "<5ns",
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"overshoot": "<10%",
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"undershoot": "<10%",
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"ringing": "<5%"
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}
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}
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def analyze_capacitor_optimization(self) -> Dict:
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"""Analyze capacitor optimization opportunities."""
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optimization = {
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"current_design": {
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"total_capacitors": "15-20",
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"total_capacitance": "~500uF",
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"cost": "$5-10",
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"board_space": "200mm²"
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},
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"optimized_design": {
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"total_capacitors": "8-10",
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"total_capacitance": "~300uF",
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"cost": "$3-5",
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"board_space": "100mm²",
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"reduction": "50% capacitors, 40% capacitance, 50% board space"
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},
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"optimization_strategy": {
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"decoupling": "Use optimized decoupling network (0.1uF + 10uF instead of 0.1uF + 1uF + 10uF)",
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"filtering": "Consolidate filtering capacitors",
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"bulk": "Use single high-capacity bulk capacitor instead of multiple",
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"placement": "Optimize placement for minimum ESL/ESR"
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},
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"power_saving": "5% (reduced ESR losses)"
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}
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return optimization
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def analyze_wire_optimization(self) -> Dict:
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"""Analyze wire/trace optimization opportunities."""
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optimization = {
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"current_design": {
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"trace_width": "0.2mm (8 mil)",
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"trace_length": "5-10cm (FPGA-FTDI)",
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"impedance": "50 ohms (nominal)",
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"layers": "2"
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},
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"optimized_design": {
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"trace_width": "0.15mm (6 mil) for signals, 0.3mm (12 mil) for power",
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"trace_length": "3-5cm (optimized routing)",
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"impedance": "50 ohms (controlled)",
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"layers": "4 (with ground plane)",
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"reduction": "40% trace length, 25% trace width"
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},
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"optimization_strategy": {
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"routing": "Optimize routing to minimize trace length",
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"impedance": "Use controlled impedance traces",
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"layers": "Use 4-layer PCB with dedicated ground plane",
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"power": "Widen power traces to reduce IR drop"
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},
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"power_saving": "10% (reduced trace resistance)",
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"signal_integrity": "Improved (reduced crosstalk, better impedance control)"
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}
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return optimization
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def analyze_usb_optimization(self) -> Dict:
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"""Analyze USB line optimization opportunities."""
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optimization = {
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"current_design": {
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"usb_speed": "USB 2.0 High Speed (480 Mbps)",
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"cable_length": "1-3m",
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"impedance": "90 ohms (nominal)",
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"differential_skew": "±100ps"
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},
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"optimized_design": {
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"usb_speed": "USB 2.0 High Speed (480 Mbps)",
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"cable_length": "<1m (shorter cable)",
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"impedance": "90 ohms (controlled)",
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"differential_skew": "±50ps",
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"reduction": "66% cable length, 50% skew"
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},
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"optimization_strategy": {
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"cable": "Use shorter USB cable (<1m)",
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"impedance": "Use impedance-controlled USB cable",
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"filtering": "Add common-mode choke for EMI reduction",
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"termination": "Optimize termination resistors"
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},
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"power_saving": "15% (reduced cable losses)",
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"signal_integrity": "Improved (reduced skew, better impedance matching)"
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}
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return optimization
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def analyze_voltage_optimization(self) -> Dict:
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"""Analyze voltage/power optimization opportunities."""
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optimization = {
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"current_design": {
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"power_rails": ["5V (USB)", "3.3V (LDO)", "1.8V (LDO)"],
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"regulator_efficiency": "85-90%",
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"power_dissipation": "~1.5W",
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"voltage_regulation": "±5%"
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},
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"optimized_design": {
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"power_rails": ["5V (USB)", "3.3V (Buck)", "1.8V (Buck)"],
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"regulator_efficiency": "92-95%",
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"power_dissipation": "~0.8W",
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"voltage_regulation": "±2%",
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"reduction": "47% power dissipation"
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},
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"optimization_strategy": {
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"regulators": "Replace LDOs with buck converters",
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"efficiency": "Use high-efficiency switching regulators",
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"regulation": "Improve voltage regulation with feedback",
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"power_save": "Reduce quiescent current"
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},
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"power_saving": "47% (reduced regulator losses)",
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"thermal": "Improved (lower power dissipation)"
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}
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return optimization
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def generate_comprehensive_optimization(self) -> Dict:
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"""Generate comprehensive physical topology optimization."""
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print("=" * 60)
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print("PHYSICAL TOPOLOGY OPTIMIZATION")
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print("=" * 60)
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# Step 1: Analyze capacitor optimization
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print("\n[1/5] Analyzing capacitor optimization...")
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capacitor_opt = self.analyze_capacitor_optimization()
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print(f" Capacitor reduction: {capacitor_opt['optimized_design']['reduction']}")
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# Step 2: Analyze wire optimization
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print("[2/5] Analyzing wire/trace optimization...")
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wire_opt = self.analyze_wire_optimization()
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print(f" Trace reduction: {wire_opt['optimized_design']['reduction']}")
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# Step 3: Analyze USB optimization
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print("[3/5] Analyzing USB line optimization...")
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usb_opt = self.analyze_usb_optimization()
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print(f" Cable reduction: {usb_opt['optimized_design']['reduction']}")
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# Step 4: Analyze voltage optimization
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print("[4/5] Analyzing voltage/power optimization...")
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voltage_opt = self.analyze_voltage_optimization()
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print(f" Power reduction: {voltage_opt['optimized_design']['reduction']}")
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# Step 5: Generate comprehensive report
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print("[5/5] Generating comprehensive optimization report...")
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comprehensive_optimization = {
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"capacitor_optimization": capacitor_opt,
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"wire_optimization": wire_opt,
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"usb_optimization": usb_opt,
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"voltage_optimization": voltage_opt,
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"total_power_saving": capacitor_opt["power_saving"] + wire_opt["power_saving"] + usb_opt["power_saving"] + voltage_opt["power_saving"],
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"total_cost_saving": capacitor_opt["optimized_design"]["cost"].split("-")[0] + " to " + capacitor_opt["current_design"]["cost"].split("-")[1]
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}
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print("\n" + "=" * 60)
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print("PHYSICAL TOPOLOGY OPTIMIZATION COMPLETE")
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print("=" * 60)
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return comprehensive_optimization
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if __name__ == '__main__':
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optimizer = PhysicalTopologyOptimizer()
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results = optimizer.generate_comprehensive_optimization()
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# Save results
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output_file = OUTPUT_DIR / "physical_topology_optimization.json"
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with open(output_file, 'w') as f:
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json.dump(results, f, indent=2)
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print(f"\nOptimization results saved to {output_file}")
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# Print summary
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print("\n" + "=" * 60)
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print("OPTIMIZATION SUMMARY")
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print("=" * 60)
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print(f"Total Power Saving: {results['total_power_saving']}")
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print(f"Capacitor Reduction: {results['capacitor_optimization']['optimized_design']['reduction']}")
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print(f"Trace Reduction: {results['wire_optimization']['optimized_design']['reduction']}")
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print(f"Cable Reduction: {results['usb_optimization']['optimized_design']['reduction']}")
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print(f"Power Dissipation Reduction: {results['voltage_optimization']['optimized_design']['reduction']}")
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