XC4VLX25-11SFG363C

XC4VLX25-11SFG363C: High-Performance Virtex-4 LX in a Compact 17mm Footprint

The XC4VLX25-11SFG363C is a logic-optimized FPGA within the Xilinx Virtex-4 LX family, specifically binned for the - Cấp độ dốc 11. This device is the ideal solution for high-speed logic applications—such as LVDS data concentration, PCIe bridging, or high-frequency state machines—where board real estate is at a premium.

By utilizing the SFG363 package, this FPGA delivers over 24k logic cells in a small-form-factor BGA. The -11 speed grade provides roughly a 10-15% performance improvement over the base -10 version, allowing for easier timing closure on complex, high-frequency designs.

Thông số kỹ thuật chính

• Tế bào logic: 24,192

• Tấm quản lý tần số tối đa (CMT): 8

• Bộ nhớ RAM khối: 1.296 KB

• Các nhóm nhỏ của DSP48: 48

• Số lượng I/O tối đa cho người dùng: 240

• Gói: SFG363 (17mm x 17mm, 0.8mm ball pitch, Lead-Free/RoHS)

• Đánh giá tốc độ: -11 (Hiệu suất cao)

• Cấp độ nhiệt độ: Thương mại (0°C đến +85°C)

Engineering Implementation & Design Considerations

1. Timing Margin and the -11 Speed Grade

The -11 speed grade is critical for designs operating near the upper frequency limits of the 90nm Virtex-4 architecture. If your design is failing to meet setup time ($T_{su}$) in a -10 speed grade, the XC4VLX25-11 provides the necessary slack. However, always re-run your Static Timing Analysis (STA) in ISE to ensure that hold times ($T_h$) remain compliant, as the faster silicon reduces propagation delays across the fabric.

2. SFG363 Routing Challenges

The 0.8mm ball pitch of the SFG363 package is significantly tighter than the 1.0mm pitch used in the 668-pin variants.

• PCB Stack-up: Ensure your PCB vendor can support the required trace widths and clearances for BGA breakout.

• Via-in-Pad: Depending on your density, via-in-pad technology may be required to access the inner I/O rings while maintaining signal integrity for high-speed differential pairs.

3. Legacy Toolchain Compatibility

The XC4VLX25-11SFG363C is a mature component and is không được hỗ trợ bởi Xilinx Vivado. Maintenance and new bitstream generation require Bộ công cụ thiết kế Xilinx ISE 14.7. When migrating designs, verify that your .ucf constraints reflect the SF363 pinout, as it is not pin-compatible with the larger FFG668 footprint.

Comparison: Virtex-4 LX25 – Speed & Package Options

Câu hỏi thường gặp dành cho kỹ sư phần cứng

Can I use the XC4VLX25-11SFG363C as a drop-in replacement for the -10 speed grade?

Yes. Xilinx FPGAs are backward compatible regarding speed grades. A -11 part will meet or exceed all timing requirements of a -10 part. Note that while timing improves, you should monitor localized thermal density if the part is running at significantly higher toggle rates.

What is the “G” in the SFG363 package name?

The “G” designates a Lead-Free (RoHS compliant) package. This is the standard for modern assembly, though it requires a slightly different reflow profile compared to the older leaded (SF363) versions.

Why is the I/O count only 240 compared to other LX25 parts?

The LX25 die has more I/O capability, but the SF363 package is physically too small to bond out all available signals. This is a deliberate trade-off for size. If your design requires more than 240 I/Os, you must migrate to the FFG668 package.

Looking for verifiable stock or an official quote?

We specialize in sourcing mature-market Xilinx silicon with full traceability. We understand that for legacy infrastructure, getting the exact speed grade and package is non-negotiable for system stability.

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