XC3S400-4FG320C - 400K-Gate Spartan-3 FPGA | AMD Xilinx
料号： XC3S400-4FG320C ✗ 停产XC3S400-4FG320C 概述
A field-programmable gate array, or FPGA, is a semiconductor whose digital logic can be configured after manufacture. An FPGA sits above fixed-function logic in the hardware hierarchy: it combines programmable logic blocks, block RAM, programmable I/O, and dedicated configuration resources on one device. Unlike a microcontroller that executes firmware from nonvolatile memory, an FPGA implements digital circuits directly in its fabric, allowing parallel operation, deterministic latency, and custom hardware interfaces.
The Spartan-3 XC3S400 provides 400,000 system gates, 221 user I/O, 294,912 flip-flops, and 8,064 configurable logic blocks. Its 1.2 V core voltage supports low-voltage, power-conscious digital designs. The device is particularly useful where several parallel datapaths must operate simultaneously or where interface timing must be controlled precisely by dedicated hardware rather than shared processor instructions.
The XC3S400 architecture provides combinational and sequential logic resources, distributed and block memory, and programmable input/output structures. Distributed RAM supports small data buffers and lookup tables, while block RAM provides larger on-chip storage without external memory access. Dedicated clock-management and configuration resources allow the FPGA to implement counters, state machines, packet filters, arithmetic pipelines, bus bridges, and embedded control functions in parallel.
Typical applications include industrial control and data acquisition, communications infrastructure, embedded vision, signal processing, and cost-sensitive consumer equipment. Its 221 I/O make it suitable for parallel sensors, converters, memory interfaces, displays, and communications transceivers. Designers can also partition the fabric into independent processing engines, allowing acquisition, filtering, and protocol handling to proceed concurrently.
For a new design, verify device speed requirements, pin-bank voltage limits, configuration memory interface, clock topology, and termination requirements before committing the PCB. A migration to another Spartan-3 speed grade can preserve the package and pinout, but timing constraints and power behavior should be revalidated with the appropriate timing constraints.
This page combines the confirmed device specifications, package characteristics, traceable source links, drop-in family alternatives, and practical engineering guidance to support component selection, schematic review, and legacy design maintenance.
直接替换替代料： XC3S400-4FG320C ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： XC3S400-4FG320C （相同外形与封装尺寸） ——差异在于 AEC-Q100 Qualification, Package Type, Speed Grade, Temperature Grade.
XC3S400-5FG320C
✅ 直接替换联系询价
查看数据手册 →XC3S400-4FGG320C
✅ 直接替换📋 参考替代料（不在目录中）
XC3S400-3FG320C
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
XC3S400-2FG320C
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
XC3S400-1FG320C
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
XC3S400-4FG320C 最大额定值与电气特性
| Device Type | Spartan-3 field-programmable gate array (FPGA) |
| System Gate Count | 400,000 system gates |
| Logic Element Count | 294,912 logic elements |
| Configurable Logic Block Count | 8,064 CLBs |
| User I/O Count | 221 I/O |
| Core Supply Voltage | 1.2 V |
| Speed Grade | -4 |
| Temperature Grade | Commercial (C) |
| FPGA Family | Spartan-3 |
| Device Designation | XC3S400 |
| Package Type | 320-ball fine-pitch BGA |
| Package Code | FG320 |
| Terminal Type | BGA ball |
| Package Shape | Square |
| 安装类型 | Surface mount |
| RoHS 状态 | Unknown |
| REACH Status | Unknown |
| AEC-Q100 Qualification | Not applicable |
XC3S400-4FG320C square 引脚配置指南
XC3S400-4FG320C（square 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： XC3S400-4FG320C.
请参阅 数据手册 以查看完整引脚配置。
典型应用
XC3S400-4FG320C 适用于 6 应用s: Industrial Data Acquisition, Communications Protocol Processing, Embedded Signal Processing, Embedded Vision and Imaging Control, Industrial Control and Motor Sequencing, Legacy Interface Consolidation.
Industrial Data Acquisition
The XC3S400-4FG320C fits parallel industrial acquisition because its 221 user I/O can connect digital sensors, counters, control signals, and parallel data converters without relying on a processor to multiplex every channel. Its 400,000 system gates and 8,064 CLBs allow acquisition, filtering, thresholding, and packetization to operate concurrently. The 1.2 V core architecture supports compact control boards, while the -4 speed grade provides a defined timing class for synchronous sensor pipelines. Use dedicated clock inputs for sampling clocks, constrain all interface paths, and verify that each I/O bank remains within its permitted voltage range.
推荐
Communications Protocol Processing
The XC3S400-4FG320C is suitable for communications equipment that requires simultaneous framing, filtering, buffering, and interface control. Its programmable fabric can implement multiple parallel channels rather than executing each operation sequentially on a microcontroller. The 221 I/O provide substantial connectivity for transceivers, clocks, data buses, and control signals, while the 8,064 CLBs support substantial state-machine logic. The legacy Spartan-3 architecture is especially relevant when maintaining an existing communication design. Confirm line rates against the -4 timing constraints and provide proper termination, clocking, and isolation between external transceiver signals and the FPGA core.
推荐
Embedded Signal Processing
The XC3S400-4FG320C can implement fixed-point filters, correlation, modulation, demodulation, and other parallel signal-processing functions in programmable logic. A filter requiring repeated multiply-accumulate operations can use multiple parallel processing lanes instead of sharing one processor, giving deterministic pipeline latency. The device's 400,000 system gates provide logic capacity, and its 221 I/O allow simultaneous streaming from converters or other data sources. Internal block and distributed memory should be assigned according to bandwidth requirements rather than treated as interchangeable. Run static timing analysis at the selected -4 speed grade and preserve margin for clock uncertainty and routing congestion.
推荐
Embedded Vision and Imaging Control
The XC3S400-4FG320C is appropriate for camera-interface timing, pixel transport, image preprocessing, and exposure-control logic in embedded imaging modules. Its 221 I/O can support parallel sensor connections, while parallel programmable pipelines can perform thresholding, color reduction, or region-of-interest processing without a separate processor for every pixel. The FPGA approach provides deterministic timing between image capture and downstream processing. For new designs, verify that the required image sensor, serializer, clock, and memory architecture can be sustained by this legacy device. Restrict timing-critical interfaces to the -4 grade's validated operating conditions and test image timing across temperature and supply corners.
推荐
Industrial Control and Motor Sequencing
The XC3S400-4FG320C supports deterministic control logic for industrial machinery, position controllers, and multi-axis sequencing. Its programmable I/O and parallel logic fabric can coordinate encoders, limit sensors, actuators, and safety-state monitoring while maintaining fixed timing relationships between channels. The 221 I/O offer ample connectivity for discrete control signals, and the 400,000 system gates allow supervisory logic to coexist with time-critical sequencing. Separate externally driven signals from sensitive logic through appropriate isolation and conditioning. Validate every timing-critical output against the -4 speed-grade constraints, and include fail-safe states in both hardware and the FPGA state machine.
推荐
Legacy Interface Consolidation
The XC3S400-4FG320C is useful in legacy system maintenance where several parallel buses and incompatible interface timing must be coordinated inside one board. Its 221 I/O and extensive programmable logic allow the FPGA to bridge bus widths, translate timing, latch legacy signals, and present a more manageable interface to a processor. The Spartan-3 architecture preserves an established hardware platform while avoiding a complete board redesign. A same-package XC3S400 speed grade can be evaluated for maintenance builds, but timing and power must be revalidated. Document pin banks, clock sources, configuration mode, and every interface conversion before approving the replacement.
推荐
推荐产品汇总
工程参考数据： XC3S400-4FG320C ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | XC3S400-5FG320C | XC3S400-4FGG320C | XC3S400-3FG320C | XC3S400-2FG320C | XC3S400-1FG320C |
|---|---|---|---|---|---|---|
| Package | 320-ball fine-pitch BGA | 320-ball fine-pitch BGA | 320-ball fine-pitch BGA | 320-ball fine-pitch BGA | 320-ball fine-pitch BGA | 320-ball fine-pitch BGA |
| Brand | AMD | AMD | AMD | AMD | AMD | AMD |
| Speed Grade | -4 | -5 | -4 | -3 | -2 | -1 |
| System Gate Count | 400,000 system gates | 400,000 system gates | 400,000 system gates | 400,000 system gates | 400,000 system gates | 400,000 system gates |
| User I/O Count | 221 I/O | 221 I/O | 221 I/O | 221 I/O | 221 I/O | 221 I/O |
| Core Supply Voltage | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 1.2 V |
| Logic Element Count | 294,912 logic elements | 294,912 logic elements | 294,912 logic elements | 294,912 logic elements | 294,912 logic elements | 294,912 logic elements |
| Configurable Logic Block Count | 8,064 CLBs | 8,064 CLBs | 8,064 CLBs | 8,064 CLBs | 8,064 CLBs | 8,064 CLBs |
关键差异点
- Balanced legacy Spartan-3 density and I/O availability （对比 XC3S400-1FG320C)
- Established -4 operating point for controlled timing migration （对比 XC3S400-5FG320C)
- Commercial-grade family device with extensive legacy support （对比 XC3S400-4FGG320C)
- Higher timing margin than slower same-family alternatives （对比 XC3S400-3FG320C)
设计说明
Assign the complete manufacturer ball map and power architecture before routing the 320-ball BGA. Keep configuration pins, clock-capable pins, and dedicated supply balls under the pin constraints stated in the official package documentation. Place decoupling structures directly beneath or close to the corresponding supply balls, maintain continuous ground-plane references, and inspect the finished assembly for shorts between fine-pitch balls.
Constrain every synchronous interface against the selected XC3S400 speed grade rather than relying on the nominal FPGA capacity. Use dedicated clock-capable pins for high-fanout clock distribution, control skew with a deliberate clocking topology, and avoid deriving high-speed clocks through ordinary fabric routing. Re-run static and dynamic timing analysis after changing speed grades because faster or slower alternatives alter both timing margin and power behavior.
Estimate the FPGA's power requirement using the vendor power calculator with the actual toggle rate, clock frequency, I/O load, and temperature range. The 1.2 V core rail is only one part of the power architecture; auxiliary rails, configuration interfaces, and I/O standards may require separate treatment. Use estimated calculations to size regulators and copper thermal relief, then confirm against measured board-level worst-case behavior.
Do not treat every XC3S400 ordering suffix as interchangeable. Confirm the device type, speed grade, temperature suffix, package code, pinout, and lifecycle status independently. For XC3S400-4FGG320C, compare the exact package drawing and ball map with XC3S400-4FG320C. A shared 320-BGA designation does not eliminate the need to verify ordering suffix, lead-free status, configuration pins, and electrical characteristics.
合规信息
The available product listings do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The commercial C ordering suffix identifies the commercial temperature grade and does not by itself establish automotive qualification.
