# Technical Diagram Analysis: Xylo HDK System Architecture ## Diagram Overview This flowchart illustrates the data flow and processing pipeline between a PC and Xylo HDK hardware components. The diagram uses two primary color-coded regions: - **White background**: PC-side processing - **Light green background**: Xylo HDK hardware components ## PC-Side Processing (White Region) 1. **Dataset** (Floppy disk icon) - Represents input data source - Connected via USB to AFESim 2. **AFESim** (Text box) - Processes dataset through "Audio encoding" - Outputs to "Result collection" 3. **Result collection** (Text box) - Receives processed data from AFESim ## Xylo HDK Hardware (Green Region) 1. **Microphone (Mic.)** (Circle icon) - Connected via dashed line to AFE - Represents audio input source 2. **AFE (Analog Front End)** (Text box) - Performs "Audio encoding" - Connected to both: - SNN core (via solid line) - FPGA (via dashed line) 3. **SNN core (Spiking Neural Network)** (Text box) - Receives encoded audio from AFE - Performs "Inference" processing 4. **FPGA (Field-Programmable Gate Array)** (Text box) - Handles "Configuration" and "Power measurement" - Connected to AFE via dashed line ## Data Flow Pathways 1. **Primary Path (Solid Lines)** - PC → Dataset → AFESim → Audio encoding → Result collection - Xylo HDK: Mic. → AFE → Audio encoding → SNN core → Inference 2. **Secondary Path (Dashed Lines)** - AFESim ↔ FPGA (Configuration/Power measurement) - AFE ↔ FPGA (Configuration) ## Key Technical Components - **Audio encoding**: Appears in both PC and Xylo HDK paths - **Inference**: Exclusive to SNN core processing - **Power measurement**: FPGA-specific function - **Configuration**: Dual-purpose (AFE-FPGA and AFESim-FPGA) ## Spatial Component Relationships - PC components form a linear left-to-right flow - Xylo HDK components arranged in a functional block diagram - USB connection serves as the primary data bridge between systems - Dashed lines indicate bidirectional/configuration relationships ## Process Flow Logic 1. Data originates in PC Dataset 2. Processed through AFESim (audio encoding) 3. Results collected and sent to Xylo HDK 4. Xylo HDK processes real-time audio through: - AFE encoding - SNN core inference - FPGA configuration/power monitoring ## Technical Constraints - No numerical data or chart elements present - All connections use either solid (data flow) or dashed (configuration) lines - No legend elements required due to consistent iconography - Color coding strictly differentiates system boundaries ## System Integration Points 1. USB interface between PC and Xylo HDK 2. AFE-FPGA configuration link 3. AFESim-FPGA bidirectional communication 4. SNN core as central inference processor This architecture demonstrates a hybrid system combining software processing (PC) with hardware-accelerated neural network inference (Xylo HDK), utilizing FPGA for low-level configuration and power management.