Field programmable gate array. The **XC4020E-3HQ240I** is a Field-Programmable Gate Array (FPGA) manufactured by **Xilinx**. Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Manufacturer:** Xilinx
- **Family:** XC4000E
- **Part Number:** XC4020E-3HQ240I
- **Logic Cells:** ~20,000 gates (equivalent)
- **Speed Grade:** -3 (medium speed)
- **Package:** HQ240 (240-pin Heat Sink Quad Flat Pack)
- **Operating Voltage:** 5V
- **I/O Pins:** 192 (user I/Os)
- **On-Chip RAM:** Configurable as distributed or block RAM
- **Configuration:** SRAM-based (volatile, requires external configuration memory)
- **Maximum Frequency:** Varies by design (~50-100 MHz typical)
### **Descriptions:**
- The **XC4020E** is part of Xilinx’s **XC4000E** family, an older generation of FPGAs designed for general-purpose digital logic applications.
- It features a **5V core voltage** and supports **3.3V or 5V I/O** standards.
- The **HQ240 package** includes a heat spreader for better thermal performance.
- It is **SRAM-based**, meaning it loses configuration when powered off and requires an external PROM for boot-up.
### **Features:**
- **Flexible Logic Architecture:** Configurable Logic Blocks (CLBs) for implementing combinational and sequential logic.
- **Programmable Interconnect:** Hierarchical routing resources for flexible signal routing.
- **On-Chip Memory:** Supports distributed RAM and block RAM configurations.
- **Dedicated Arithmetic Logic:** Includes fast carry logic for arithmetic functions.
- **Multiple I/O Standards:** Supports TTL, CMOS, and LVCMOS interfaces.
- **JTAG Boundary Scan:** Supports IEEE 1149.1 for testing and debugging.
- **Reconfigurable:** Can be reprogrammed multiple times for design iterations.
This FPGA is typically used in legacy systems, industrial controls, and prototyping applications. For exact timing and performance metrics, refer to Xilinx’s **XC4000E datasheet**.
