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AMD XC3S400A-4FG320I
- Part No.:
- XC3S400A-4FG320I
- Manufacturer:
- AMD
- Category:
- FPGAs (Field Programmable Gate Array)
- Package:
- 320-BGA
- Datasheet:
-
XC3S400A-4FG320I.pdf
- Description:
- IC FPGA 251 I/O 320FBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
XC3S400A-4FG320I from AMD (formerly Xilinx) is a Spartan-3A FPGA with 400,000 system gates, 216 I/O pins, and a -4 speed grade in a 320-pin Fine-Pitch Ball Grid Array (FBGA) package. It integrates up to 8,064 logic cells, 720 Kbits of block RAM, and supports LVCMOS/LVTTL I/O standards for embedded control and interface bridging applications.
For engineers reviewing the XC3S400A-4FG320I datasheet, pinout, applications, or equivalent options, key selection considerations include I/O voltage flexibility (1.2 V to 3.3 V), distributed RAM depth (16 bits per LUT), and configuration via Master Serial mode using external PROM.
Technical Context
The XC3S400A-4FG320I implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), dedicated multipliers, and digital clock managers (DCMs) supporting input frequency ranges from 1.5 MHz to 200 MHz. It uses SRAM-based configuration memory and requires external configuration PROM for power-on initialization.
It supports SelectIO™ technology with programmable drive strength (2 mA to 24 mA), slew rate control, and on-chip termination (up to 50 Ω). Configuration interfaces include JTAG, Master Serial, and Slave SelectMAP modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Cells | 8,064 - provides combinational and sequential logic capacity for medium-complexity digital controllers |
| Block RAM | 720 Kbits - enables local data buffering, FIFOs, and small lookup tables without external memory |
| I/O Pins | 216 - supports parallel bus interfacing, sensor aggregation, and multi-peripheral connectivity |
| Speed Grade | -4 - guarantees timing closure up to 333 MHz internal clock frequency under worst-case conditions |
| Configuration Mode | Master Serial - allows single-PROM boot with automatic loading at power-up |
| I/O Standards | LVCMOS, LVTTL, PCI - enables direct interfacing with microcontrollers, ADCs, and legacy peripherals |
Pinout & Package
XC3S400A-4FG320I is housed in a 320-pin Fine-Pitch Ball Grid Array (FBGA) package with 216 user I/Os, 8 dedicated configuration pins (e.g., INIT_B, PROGRAM_B, DONE), 4 global clock inputs, and power/ground distribution across multiple VCCO, VCCAUX, and GND balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PROGRAM_B | Active-Low Configuration Initiate | Resets configuration logic and clears SRAM before new bitstream load |
| INIT_B | Open-Drain Status Output | Indicates configuration memory readiness and error during startup |
| DONE | Open-Drain Completion Signal | Signals successful configuration completion; must be pulled high externally |
| CCLK | Configuration Clock Input | Drives serial bitstream loading in Master Serial mode |
| GCLK0–GCLK3 | Global Clock Inputs | Low-skew routing to all CLBs and I/O banks for synchronous design |
Key Features
| Feature | Design Value |
|---|---|
| Digital Clock Manager (DCM) | Provides jitter-reduced clock synthesis, phase shifting, and frequency multiplication/division for precise timing control |
| SelectIO™ Technology | Enables mixed-voltage I/O operation across 12 banks with independent VCCO settings per bank |
| Distributed RAM | 16-bit deep LUT RAM per slice supports fast state storage without consuming block RAM resources |
| Multiplier Blocks | Four 18×18-bit signed multipliers support real-time arithmetic in motor control and signal processing |
Applications
| Industrial PLC I/O Module | Automotive Camera Interface Bridge |
|---|---|
Use Scenario: Real-time digital signal conditioning and protocol translation between field sensors and host controller. IC Role / Device Role / Timing Role: FPGA acts as a reconfigurable logic engine handling GPIO expansion, pulse-width modulation, and SPI-to-parallel conversion. Use Value: Enables firmware-upgradable I/O mapping and deterministic latency under 200 ns for safety-critical cycle times. | Use Scenario: Aggregating and formatting video data from multiple CMOS image sensors before transmission over FPD-Link. IC Role / Device Role / Timing Role: XC3S400A-4FG320I serves as a pixel-data formatter and serializer with embedded sync generation. Use Value: Supports 720p@60fps input with 10-bit parallel capture and on-chip line buffering to absorb timing skew. |
| Medical Ultrasound Beamformer | Test Equipment Digital Pattern Generator |
Use Scenario: Time-aligned delay calculation and channel weighting for phased-array transducer signals. IC Role / Device Role / Timing Role: XC3S400A-4FG320I implements fixed-point delay-line arithmetic and FIR filtering per channel. Use Value: Delivers sub-nanosecond inter-channel skew control and real-time coefficient updates via JTAG. | Use Scenario: Generating synchronized multi-channel digital stimulus waveforms for IC functional validation. IC Role / Device Role / Timing Role: Acts as a deterministic pattern sequencer with programmable edge placement and loop depth. Use Value: Achieves 3.3 ns resolution on output transitions and supports 128K-depth vector memory using block RAM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FPGA-based logic implementation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| XC3S500E-4FG320C | Higher logic density (11,264 LCs), same package, commercial temperature range (0°C to 85°C) | Suitable for designs requiring additional logic resources but not extended temperature operation | Select when extra LUTs and block RAM are needed and industrial temp range is not required |
| XC6SLX45-3FGG484I | Next-generation Spartan-6 architecture, 43,661 logic cells, 484-pin FBGA, -3 speed grade | Offers higher performance, lower static power, and integrated PCIe endpoint blocks | Choose for new designs needing scalability, DDR2/3 memory interface, or longer product lifecycle support |
Compared with XC3S400A-4FG320I, the XC3S500E-4FG320C offers more logic capacity in identical packaging but lacks extended temperature qualification, while the XC6SLX45-3FGG484I delivers architectural improvements and broader interface support at the cost of board redesign and toolchain migration.
Availability
XC3S400A-4FG320I is available at Aetrix Electronics and suitable for industrial automation, medical imaging, and test equipment applications requiring stable component supply and long-term obsolescence management.
Supply support for XC3S400A-4FG320I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
AMD acquired Xilinx in 2022 and maintains the Spartan family as part of its adaptive computing portfolio for cost-sensitive, high-volume embedded systems.
The Spartan-3A product line was designed for low-power, logic-intensive applications in industrial control, communications infrastructure, and instrumentation where predictable timing and mature toolchain support are essential.
FAQ
What is the maximum operating junction temperature for XC3S400A-4FG320I?
The XC3S400A-4FG320I has an industrial temperature grade (I) with a specified maximum junction temperature of 100°C. This rating ensures reliable operation in environments such as factory-floor controllers and outdoor test gear where ambient temperatures may reach 85°C and PCB self-heating adds thermal margin. Thermal design must maintain θJA ≤ 26.5°C/W for safe continuous operation.
Does XC3S400A-4FG320I support JTAG boundary-scan testing?
Yes, XC3S400A-4FG320I fully supports IEEE 1149.1 JTAG boundary-scan for device programming, debugging, and interconnect testing. The TDI, TDO, TMS, and TCK pins are dedicated and electrically isolated during configuration. JTAG access remains available post-configuration for runtime visibility into internal registers and I/O states without halting logic operation.
Can XC3S400A-4FG320I be configured using a microcontroller as a master?
Yes, XC3S400A-4FG320I supports Slave SelectMAP mode, enabling configuration by an external microcontroller writing parallel data to the FPGA's configuration port. This requires 8-bit data bus alignment, proper handshaking via BUSY and DONE signals, and adherence to setup/hold timing relative to CCLK. The microcontroller must manage the entire bitstream transfer sequence including synchronization and CRC verification.
What configuration memory devices are compatible with XC3S400A-4FG320I in Master Serial mode?
XC3S400A-4FG320I in Master Serial mode is compatible with Xilinx Platform Flash PROMs (e.g., XCF02S, XCF04S, XCF08P) and third-party SPI flash devices meeting the 20 MHz CCLK timing requirement and supporting standard SPI read commands. Configuration bitstream size for XC3S400A-4FG320I is approximately 2.1 Mbits, requiring ≥2.5 Mbit density.
Is differential I/O supported on XC3S400A-4FG320I?
No, XC3S400A-4FG320I does not support native LVDS or other differential I/O standards. It supports only single-ended I/O standards including LVCMOS, LVTTL, and PCI. Differential signaling requires external termination networks or companion transceivers. For true differential I/O, later families like Spartan-6 or Artix-7 are required.
XC3S400A-4FG320I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- AMD
- Series:
- Spartan®-3A
- Package/Case:
- 320-BGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of LABs/CLBs:
- 896
- Number of Logic Elements/Cells:
- 8064
- Total RAM Bits:
- 368640
- Number of I/O:
- 251
- Number of Gates:
- 400000
- Voltage - Supply:
- 1.14V ~ 1.26V
- Mounting Type:
- Surface Mount
- Operating Temperature:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 320-FBGA (19x19)
XC3S400A-4FG320I FAQ
1.How can I place an order for XC3S400A-4FG320I through Aetrix?
Please submit a Request for Quotation (RFQ) for XC3S400A-4FG320I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for XC3S400A-4FG320I reliable?
The price and inventory of XC3S400A-4FG320I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC3S400A-4FG320I is usually 5 days.
3.What payment methods are accepted for XC3S400A-4FG320I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC3S400A-4FG320I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XC3S400A-4FG320I?
XC3S400A-4FG320I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XC3S400A-4FG320I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for XC3S400A-4FG320I?
For technical support, including XC3S400A-4FG320I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC3S400A-4FG320I requirements.
6.How does Aetrix verify that XC3S400A-4FG320I is sourced from the original manufacturer or authorized distributors?
All XC3S400A-4FG320I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that XC3S400A-4FG320I meets industry standards.
7.What is the process for return or replacement of XC3S400A-4FG320I?
All XC3S400A-4FG320I units undergo pre-shipment inspection (PSI). If there is an issue with XC3S400A-4FG320I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The XC3S400A-4FG320I part is unused and in its original packaging.
Return procedure for XC3S400A-4FG320I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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