The XC18V04 is a 4 Mbit In-System Programmable Configuration PROMs (Configuration Read-Only Memory) from Xilinx. They are designed to configure Xilinx Field-Programmable Gate Arrays (FPGAs). These PROMs store the configuration data that determines the functionality of the FPGA. They are programmed via a serial interface.

Applications

• Xilinx FPGA Configuration: Used to store the configuration bitstream for Xilinx FPGAs.
• Embedded Systems: Used as non-volatile memory in embedded systems, especially when coupled with FPGAs.
• Networking Equipment: Stores configuration data for FPGAs used in routers, switches and other network devices.
• Industrial Control Systems: Configures FPGAs controlling industrial processes and automation.
• Aerospace and Defense Applications: Used where in-system programmability and reliable storage are required.

Features

• In-System Programmable: Can be programmed while mounted on the circuit board.
• 4 Mbit Density: Provides 4 Mbits (512KB) of non-volatile storage capacity.
• Serial Configuration Interface: Communicates with the FPGA via a serial interface.
• Low Power Standby Mode: Consumes very little power in standby mode.
• Endurance: High endurance, allowing for multiple programming cycles.
• Operating Voltage: Typically operates at 3.3V or 5V depending on the specific part number.

Benefits

• Flexibility: Allows for easy reconfiguration of the FPGA, enabling design changes without replacing hardware.
• Simplified Development: Simplifies the development process by allowing for in-system programming.
• Reduced Board Space: Compact package saves valuable board space.
• Low Power Consumption: Low power consumption extends battery life in portable devices.
• High Reliability: Provides reliable storage of configuration data, ensuring proper FPGA operation.

Additional Details

The XC18V04 typically comes in packages like PLCC, SOIC, and VQFP. The operating temperature range is usually commercial or industrial grade (-40°C to +85°C). The configuration data is loaded into the FPGA during power-up. Refer to the Xilinx datasheet for detailed timing diagrams, pinout information, and programming instructions. The data is transferred serially from the PROM to the FPGA. Several PROMs can be cascaded to configure larger FPGAs. Power-on reset is integrated within the chip to initialize its registers to default.