Overview of XC18V01VQG44I FPGA Configuration Memory
The XC18V01VQG44I is a high-performance, in-system programmable configuration PROM (Programmable Read-Only Memory) manufactured by AMD (formerly Xilinx). This industrial-grade memory device features 1 megabit storage capacity and operates at 3.3V, making it the ideal solution for storing and loading configuration bitstreams in Xilinx FPGA applications. With its 44-pin VQFP package and industrial temperature rating (-40°C to +85°C), the XC18V01VQG44I delivers reliable performance in demanding embedded systems and industrial automation environments.
Key Technical Specifications
| Specification |
Details |
| Part Number |
XC18V01VQG44I |
| Manufacturer |
AMD/Xilinx |
| Memory Type |
Configuration PROM |
| Memory Capacity |
1 Megabit (128K x 8) |
| Supply Voltage |
3.3V (3.0V – 3.6V) |
| Package Type |
44-Pin VQFP (Very Thin Quad Flat Package) |
| Operating Temperature |
-40°C to +85°C (Industrial) |
| Programming Interface |
In-System Programmable (ISP) |
| Data Interface |
8-bit Parallel / Serial |
| Clock Frequency |
Up to 33 MHz |
XC18V01VQG44I Features & Benefits
In-System Programming Capability
The XC18V01VQG44I supports in-system programming (ISP) through a JTAG interface, allowing engineers to update FPGA configuration data without removing the device from the circuit board. This feature significantly reduces maintenance costs and enables field upgrades for embedded systems.
Multiple Configuration Modes
This configuration PROM supports various programming modes:
- Master SelectMAP Mode: FPGA generates configuration clock
- Slave Parallel Mode: External oscillator provides clock signal
- Slave SelectMAP Mode: External timing control
- Serial Configuration Mode: Space-efficient single-wire data transfer
Robust Design for Industrial Applications
Designed for industrial temperature ranges (-40°C to +85°C), the XC18V01VQG44I ensures reliable operation in harsh environments including factory automation, telecommunications equipment, and aerospace applications.
Pin Configuration & Package Details
| Package Feature |
Specification |
| Package Style |
VQFP (Very Thin Quad Flat Package) |
| Pin Count |
44 Pins |
| Package Dimensions |
10mm x 10mm x 1.4mm |
| Lead Pitch |
0.8mm |
| Moisture Sensitivity |
MSL 3 (Moisture Sensitivity Level 3) |
| RoHS Compliant |
Yes |
Critical Pin Functions
- VCC/GND: Power supply and ground connections
- D0-D7: 8-bit parallel data output pins
- CE# (Chip Enable): Active-low chip enable control
- OE# (Output Enable): Active-low output enable
- CCLK: Configuration clock input
- CEO: Chip enable output for cascading
- JTAG Pins: TDI, TDO, TCK, TMS for programming
Performance Characteristics
| Parameter |
Min |
Typ |
Max |
Unit |
| Supply Voltage (VCC) |
3.0 |
3.3 |
3.6 |
V |
| Supply Current (Active) |
– |
20 |
30 |
mA |
| Supply Current (Standby) |
– |
10 |
100 |
μA |
| Access Time |
– |
50 |
70 |
ns |
| Clock Frequency |
– |
– |
33 |
MHz |
| Configuration Time |
– |
8 |
– |
ms |
Application Use Cases
1. FPGA Configuration Storage
The primary application of the XC18V01VQG44I is storing configuration bitstreams for Xilinx FPGAs including Spartan, Artix, and Virtex series devices. The 1-megabit capacity accommodates small to medium-sized FPGA designs.
2. Embedded System Boot Memory
Ideal for embedded systems requiring non-volatile boot code storage, the XC18V01VQG44I provides instant-on capability with fast access times and reliable data retention.
3. Industrial Automation Controllers
With its industrial temperature rating and robust design, this PROM excels in PLC (Programmable Logic Controller) applications, industrial robots, and process control systems.
4. Telecommunications Equipment
Telecommunications infrastructure relies on the XC18V01VQG44I for configuration management in network switches, base stations, and routing equipment.
5. Aerospace & Defense Systems
The industrial-grade reliability makes this device suitable for avionics, satellite systems, and military communication equipment.
Programming Methods
JTAG Programming Interface
The XC18V01VQG44I implements IEEE 1149.1 Boundary-Scan (JTAG) standard with a four-wire Test Access Port (TAP):
- TCK: Test Clock
- TMS: Test Mode Select
- TDI: Test Data Input
- TDO: Test Data Output
Compatible Programming Tools
- Xilinx iMPACT: Legacy programming software
- Vivado Hardware Manager: Modern AMD/Xilinx tool suite
- Platform Cable USB II: Hardware programmer
- Third-party JTAG programmers: Supporting Xilinx SVF/XSVF formats
Cascading Configuration
The XC18V01VQG44I supports cascading multiple PROMs for larger configuration requirements:
- CEO Output: Drives CE input of next device in chain
- Shared Clock: All devices use common CCLK signal
- Shared Data Bus: Parallel data outputs interconnected
- Compatible Devices: Works with XC18V series and XC17V one-time programmable PROMs
Design Considerations
Power Supply Requirements
Ensure VCC rises monotonically from 0V to nominal voltage within specified rise time. Power-on reset (POR) typically triggers at 2.0V threshold.
Thermal Management
The VQFP-44 package exhibits thermal resistance (θJA) of approximately 50°C/W. Adequate PCB thermal design and airflow ensure reliable operation under full load conditions.
PCB Layout Guidelines
- Place 0.1μF decoupling capacitors close to VCC pins
- Maintain clean ground plane for signal integrity
- Route JTAG signals with controlled impedance
- Keep configuration data traces short to minimize noise
ESD Protection
Implement proper ESD protection measures as the device is sensitive to electrostatic discharge. Follow JEDEC standards for handling and assembly.
Quality & Reliability
| Reliability Parameter |
Specification |
| Data Retention |
20 Years (typical) |
| Endurance |
10,000 Program/Erase Cycles |
| MTBF |
> 1,000,000 hours |
| Quality Standard |
ISO 9001 Certified Manufacturing |
Ordering Information & Package Marking
Part Number Breakdown
XC18V01VQG44I
- XC18V: Product family (In-System Programmable PROM)
- 01: Memory density (1 Megabit)
- V: Voltage (3.3V operation)
- Q: Speed grade
- G: RoHS compliance indicator
- 44: Pin count
- I: Industrial temperature range (-40°C to +85°C)
Available Temperature Grades
- C Grade: Commercial (0°C to +70°C) – XC18V01VQG44C
- I Grade: Industrial (-40°C to +85°C) – XC18V01VQG44I
Comparison with Related Products
| Feature |
XC18V01 |
XC18V02 |
XC18V04 |
| Capacity |
1 Mbit |
2 Mbit |
4 Mbit |
| Organization |
128K x 8 |
256K x 8 |
512K x 8 |
| Typical Price |
$$ |
$$$ |
$$$$ |
| Best For |
Small FPGAs |
Medium FPGAs |
Large FPGAs |
Storage & Handling Precautions
- Moisture Sensitivity: MSL 3 – Floor life 168 hours at ≤30°C/60% RH
- Storage Conditions: -55°C to +125°C in moisture barrier bag
- Baking Requirements: 24 hours at 125°C if floor life exceeded
- ESD Precautions: Handle with ESD-safe equipment and grounding
Technical Support & Resources
Documentation Available
- Detailed product datasheet (DS026)
- Application notes for FPGA configuration
- Programming reference guides
- PCB layout recommendations
- Thermal design guidelines
Development Tools
- Xilinx Vivado Design Suite
- ISE Design Suite (legacy)
- Simulation models (IBIS, BSDL)
- Reference designs and example code
Frequently Asked Questions
Q: What FPGAs are compatible with XC18V01VQG44I?
The XC18V01VQG44I is compatible with Xilinx Spartan-3/3E/3A, Virtex-II/II Pro, and other FPGAs requiring 1Mb or less configuration memory.
Q: Can I use this PROM with non-Xilinx FPGAs?
While designed for Xilinx FPGAs, the device can potentially work with other FPGAs supporting similar configuration protocols, though compatibility should be verified.
Q: What’s the difference between XC18V01VQG44C and XC18V01VQG44I?
The “C” suffix indicates commercial temperature range (0°C to +70°C), while “I” denotes industrial temperature range (-40°C to +85°C). The “I” grade offers wider temperature operation for demanding environments.
Q: How many times can I reprogram the device?
The XC18V01VQG44I supports a minimum of 10,000 program/erase cycles with 20-year typical data retention.
Q: Is JTAG boundary scan testing supported?
Yes, the device fully implements IEEE 1149.1 Boundary-Scan standard, enabling both programming and board-level testing through a single JTAG interface.
Conclusion
The XC18V01VQG44I configuration PROM represents a reliable, cost-effective solution for FPGA configuration storage in industrial applications. Its combination of in-system programmability, industrial temperature rating, and proven Xilinx/AMD heritage makes it an excellent choice for embedded systems requiring non-volatile configuration memory. Whether you’re designing telecommunications equipment, industrial controllers, or aerospace systems, the XC18V01VQG44I delivers the performance and reliability your application demands.
For more information about Xilinx FPGA solutions and compatible configuration memory devices, explore our comprehensive technical resources and product selection guides.
