XC7K325T-1FFG900C Datasheet, Pinout, Equivalents, and Specs
The XC7K325T-1FFG900C is a high-performance Field-Programmable Gate Array (FPGA) from the Xilinx Kintex-7 family, manufactured using a 28nm process technology. It is engineered to provide a balanced combination of logic density, high-speed serial connectivity, and digital signal processing (DSP) capability. This device is positioned to serve mid-range applications requiring significant parallel processing power and bandwidth without the power consumption levels of higher-end FPGAs.
Table of Contents
What is the XC7K325T-1FFG900C?
The XC7K325T-1FFG900C is a member of the Kintex-7 FPGA family, designed to deliver optimal price/performance for a wide range of applications. Its internal architecture is built around a scalable fabric of Configurable Logic Blocks (CLBs), each containing 6-input look-up tables (LUTs) and flip-flops. This logic fabric is complemented by substantial on-chip memory resources in the form of 36Kb Block RAMs (BRAMs), dedicated DSP slices for accelerating arithmetic-intensive functions, and high-speed GTX serial transceivers capable of data rates up to 12.5 Gb/s. The device targets applications such as 4G/5G wireless infrastructure, medical imaging systems, broadcast video equipment, and high-performance computing where parallel data processing and high I/O bandwidth are critical design parameters.
Pinout Configuration and Packaging
The XC7K325T-1FFG900C is provided in an FFG900 package. This is a 900-ball Fine-Pitch Ball Grid Array (FBGA) with a 1.0mm ball pitch and a body size of 31mm x 31mm. The pinout is meticulously organized to support high-speed design, with dedicated power and ground pins strategically placed to ensure a stable power delivery network (PDN) and minimize signal integrity issues. The 900 pins are allocated to user I/O, high-speed serial transceiver channels (GTX), dedicated configuration pins (e.g., MODE, JTAG), clock inputs, and multiple power rails for the core logic (VCCINT), auxiliary circuits (VCCAUX), I/O banks (VCCO), and transceivers.
Core Architectural Features
- High-Density Logic Fabric: Contains 326,080 logic cells, 203,800 6-input LUTs, and 407,600 flip-flops, providing substantial resources for complex digital logic implementation.
- Integrated DSP Slices: Features 840 dedicated DSP48E1 slices, each capable of performing 25x18 multiplication, addition, and accumulation, ideal for accelerating signal processing algorithms like FIR filters and FFTs.
- High-Speed Serial Transceivers: Equipped with 16 GTX transceivers, each supporting data rates from 500 Mb/s to 12.5 Gb/s. These are suitable for implementing standard protocols such as PCI Express, Serial RapidIO, 10 Gigabit Ethernet, and CPRI.
- Flexible Memory Resources: Includes 16,740 Kbits of total Block RAM, configurable as 36Kb or 18Kb blocks. This on-chip memory supports true dual-port operation, enabling efficient data buffering and sharing between different clock domains.
- Advanced Clock Management: Incorporates multiple Mixed-Mode Clock Managers (MMCMs) and Phase-Locked Loops (PLLs) for precise clock synthesis, jitter filtering, and deskew, ensuring robust timing closure for high-performance designs.
Specifications Parameter Table
| Specification | Technical Details |
|---|---|
| Logic Cells | 326,080 |
| LUTs (6-input) | 203,800 |
| Total Block RAM | 16,740 Kbits |
| DSP Slices (DSP48E1) | 840 |
| Number of GTX Transceivers | 16 (up to 12.5 Gb/s) |
| Maximum User I/O | 500 |
| Package | FFG900 (31x31mm, 1.0mm pitch) |
| Speed Grade | -1 (Commercial Grade) |
XC7K325T-1FFG900C Equivalents, Cross Reference, and Lifecycle
The XC7K325T-1FFG900C is an active and mature component in the Xilinx portfolio. When considering equivalents, pin-to-pin compatibility is often achievable within the same device family and package combination. For example, a design using the FFG900 package can be migrated to a higher-density device like the XC7K410T-1FFG900C for increased logic resources, or to a lower-density XC7K160T-1FFG900C for cost optimization, provided the I/O and transceiver requirements are met. It is crucial to verify resource utilization and pin assignments before migration. For projects requiring different performance or power characteristics, engineers can explore the complete Browse Kintex-7 Series to find devices with different speed grades or temperature ratings. To verify stock levels and current market pricing for this specific component, it is recommended to Check XC7K325T-1FFG900C Inventory & Pricing with authorized distributors.
Typical Application & Circuit Considerations
The XC7K325T-1FFG900C is well-suited for applications requiring high-throughput data processing and connectivity. In a typical system, it may serve as a central processing hub in medical ultrasound equipment, a channel card in a 4G/5G base station, or a video processing engine in a broadcast switcher. For successful implementation, PCB design requires careful attention to the power delivery network (PDN). Multiple low-inductance decoupling capacitors must be placed close to the BGA pins for each power rail (VCCINT, VCCAUX, VCCO, MGTAVCC, etc.) to ensure low impedance across a wide frequency range. For the GTX transceivers, differential pair routing must adhere to strict impedance control (typically 100Ω differential) and length-matching constraints to maintain signal integrity at multi-gigabit data rates.
Video Demonstration
Frequently Asked Questions (XC7K325T-1FFG900C FAQ)
Q: What is the significance of the "-1" speed grade in the XC7K325T-1FFG900C part number?
A: The "-1" in the part number denotes the speed grade of the device. In Xilinx FPGAs, a lower number typically indicates a slower performance grade. The -1 grade is the slowest commercial temperature grade, offering the lowest static power consumption but also the lowest maximum clock frequency (Fmax) and slowest I/O performance. Faster speed grades, such as -2 and -3, are available for the same device, providing higher performance at the cost of increased static and dynamic power consumption. The choice of speed grade is a critical trade-off between performance requirements and the system's power budget.
Q: How are the GTX transceivers in the XC7K325T-1FFG900C powered and what are the PCB layout considerations?
A: The GTX transceivers require dedicated, low-noise power supplies, separate from the core logic. Key power rails include MGTAVCC for the analog circuitry and MGTAVTT for the termination circuits. These rails are highly sensitive to noise, so it is critical to use dedicated voltage regulators and extensive filtering. PCB layout considerations include placing decoupling capacitors as close as possible to the BGA balls, using solid ground planes to provide a low-impedance return path, and routing the high-speed differential traces with controlled 100-ohm impedance and minimal discontinuities to preserve signal integrity.
Q: Can the Block RAM (BRAM) in this device be configured as dual-port RAM?
A: Yes, the Block RAMs in the Kintex-7 architecture are highly flexible. Each 36Kb BRAM primitive can be configured in various modes, including True Dual-Port (TDP) RAM. In TDP mode, the memory block has two completely independent ports (Port A and Port B), each with its own address, data, clock, and control signals. This allows for simultaneous read and write operations to different memory locations from two different clock domains, making it ideal for implementing FIFOs and data buffers between asynchronous system components.
Q: What is the difference between a CLB and a Slice in the Kintex-7 architecture?
A: The architecture is hierarchical. The Configurable Logic Block (CLB) is the primary resource for implementing sequential and combinatorial logic. Within the Kintex-7 architecture, each CLB contains two Slices. Each Slice, in turn, is the fundamental building block containing four 6-input LUTs, eight flip-flops, carry logic chains, and wide-function multiplexers. This structure allows the synthesis tools to efficiently pack logic, with a single CLB capable of implementing a significant amount of logic functionality.
Q: What configuration modes are supported by the XC7K325T-1FFG900C?
A: The XC7K325T-1FFG900C supports several configuration modes to load the bitstream from non-volatile memory upon power-up. The primary modes include Master SPI (x1, x2, x4) for booting from a standard SPI flash, Master BPI (x8, x16) for booting from a parallel NOR flash, and Slave Serial/Parallel for configuration by an external processor. The selection of a configuration mode depends on factors like required configuration time, cost of the non-volatile memory, and system architecture. Additionally, the JTAG interface is always available for in-system programming and debugging regardless of the selected mode.
Alan Carter
Senior Hardware Engineer & Component Specialist
Alan has over 15 years of expertise in embedded systems design, FPGA architecture, and global semiconductor supply chains. He specializes in component cross-referencing, lifecycle management, and helping OEMs navigate supply shortages.
