The XC4085XLATM-BG432AKP is a high-capacity field-programmable gate array (FPGA) from Xilinx’s XC4000XLA family. Designed for complex digital logic applications, this device delivers up to 85,000 system gates, 3,136 Configurable Logic Blocks (CLBs), and 352 user I/O pins in a compact 432-pin BGA package — making it one of the most capable devices in the legacy XC4000XLA series. Whether you’re maintaining industrial control systems, telecommunications hardware, or embedded computing platforms, the XC4085XLATM-BG432AKP remains a reliable, time-tested solution for demanding programmable logic design.
What Is the XC4085XLATM-BG432AKP?
The XC4085XLATM-BG432AKP belongs to the Xilinx FPGA XC4000XLA family — an advanced evolution of the original XC4000 series that introduced lower power consumption, improved routing efficiency, and enhanced I/O flexibility through a 0.35 µm CMOS process node. The “TM” suffix indicates tape and reel packaging (for automated SMT assembly), while “BG432” denotes the 432-ball Ball Grid Array (BGA) package. “AKP” identifies this as an automotive/industrial-grade variant with an extended temperature range of –40°C to +100°C.
This part is particularly valued in legacy system maintenance, military, aerospace, and industrial automation environments where long-term hardware availability and functional stability are critical.
Key Features of the XC4085XLATM-BG432AKP
- 85,000 system gates for high-density logic implementation
- 3,136 Configurable Logic Blocks (CLBs) — each with two 4-input function generators
- 352 user I/O pins available in the BG432 package
- 0.35 µm CMOS process delivering improved speed and lower power
- 3.3V core and I/O supply voltage with 5V TTL-compatible inputs
- 8 global low-skew clock networks for precise, system-wide timing distribution
- FastCLK buffers with typically <1.5 ns clock delay to I/O banks
- Select-RAM™ on-chip memory with dual-port, synchronous operation
- IEEE 1149.1 JTAG boundary-scan for in-circuit testing and configuration
- Multiple configuration modes: Master Serial, Slave Serial, Slave Parallel, Express
- PCI-compatible I/O supporting 5V TTL, 3.3V LVTTL, and PCI bus standards
- Programmable slew rate and drive strength per I/O pin
- IDCODE:
0x00238093 for JTAG identification
- Extended temperature range (AKP): –40°C to +100°C junction temperature
XC4085XLATM-BG432AKP Full Specifications Table
| Parameter |
Value |
| Part Number |
XC4085XLATM-BG432AKP |
| Manufacturer |
AMD Xilinx (formerly Xilinx Inc.) |
| Family |
XC4000XLA |
| Logic Density |
~85,000 system gates |
| Configurable Logic Blocks (CLBs) |
3,136 |
| Logic Cells |
7,448 |
| User I/O Pins (BG432 Package) |
352 |
| Package Type |
432-Ball BGA (BG432) |
| Package Format |
Tape & Reel (TM suffix) |
| Temperature Grade |
AKP (–40°C to +100°C Tj) |
| Core Supply Voltage (VCCINT) |
3.3V |
| I/O Supply Voltage (VCCIO) |
3.3V |
| Process Technology |
0.35 µm CMOS |
| Global Clock Networks |
8 |
| Max System Frequency |
Up to 294 MHz (speed grade dependent) |
| Configuration Interface |
JTAG (IEEE 1149.1), Serial, Parallel |
| On-Chip RAM |
Select-RAM™ (dual-port, synchronous) |
| Mounting Type |
Surface Mount |
| RoHS Compliance |
Lead-free / RoHS Compliant |
Package & Pin Configuration Details
The BG432 package is a 40×40 ball grid array with 432 total solder balls. Of these, 352 are dedicated user I/O pins, with the remaining balls assigned to power (VCCINT, VCCIO), ground (GND), and configuration control signals.
| Package |
Total Balls |
User I/O Pins |
VCCINT Pins |
| BG560 |
560 |
Not specified for XLA |
— |
| BG432 (this part) |
432 |
352 |
Left unconnected (XLA) |
| BG352 |
352 |
289 |
— |
| HQ240 |
240 |
193 |
— |
Note for XV users: In BG432 and BG352 packages, XC4000XV devices allocate 16 I/O pins to VCCINT (2.5V). For XLA devices like the XC4085XLATM-BG432AKP, the VCCINT pins are pulled to 3.3V internally and must not be driven externally.
XC4085XLATM-BG432AKP vs. Similar Xilinx XC4000XLA Devices
| Part Number |
Gates |
CLBs |
I/O Pins |
Package |
Temp Grade |
| XC4062XLA-BG432 |
~62,000 |
2,304 |
352 |
BG432 |
Commercial/Industrial |
| XC4085XLATM-BG432AKP |
~85,000 |
3,136 |
352 |
BG432 |
–40°C to +100°C |
| XC40110XV-BG432 |
~110,000 |
3,969 |
336 |
BG432 |
Commercial |
| XC40150XV-BG432 |
~150,000 |
5,625 |
336 |
BG432 |
Commercial |
Clock Architecture and Timing Resources
The XC4085XLATM-BG432AKP provides a robust clocking infrastructure to support high-performance synchronous designs:
Global Clock Networks: Eight global low-skew clock buffers distribute signals across the entire device with minimal skew, ensuring reliable timing closure in complex, multi-clock domain designs.
FastCLK Buffers: Two FastCLK buffers are positioned on each of the left and right edges of the die. Each delivers fast clock signals — typically less than 1.5 ns delay — to all IOBs within the associated I/O octant. These can be instantiated using BUFFCLK symbols in the Xilinx ISE design environment.
Global Early Buffers (BUFGE): Buffers #1, #2, #5, and #6 also support fast clock delivery (<1.5 ns delay) to I/O banks, providing additional flexibility for high-frequency I/O applications.
I/O Standards and Electrical Compatibility
One of the key advantages of the XC4085XLATM-BG432AKP for legacy and mixed-voltage designs is its broad I/O standard support:
| I/O Standard |
Voltage Level |
Application |
| 5V TTL |
5V-tolerant inputs |
Legacy 5V backplane systems |
| 3.3V LVTTL |
3.3V |
Modern digital interfaces |
| PCI |
3.3V / 5V |
PCI bus add-in cards |
| CMOS |
3.3V |
Low-noise, rail-to-rail I/O |
Each I/O Bank (IOB) includes programmable slew rate control and selectable drive strengths, giving designers fine-grained control over signal integrity and EMI compliance. Unused I/O pins in XLA devices can be configured with weak pull-up or pull-down resistors to prevent floating states.
On-Chip Memory: Select-RAM™
The XC4085XLATM-BG432AKP integrates Xilinx Select-RAM™ technology, which utilizes the CLB fabric itself as distributed RAM. Key characteristics include:
- Dual-port, synchronous operation for simultaneous read/write access
- Supports FIFO, register files, and embedded buffer implementations
- Compatible with the
MEMGEN utility for memory instance generation within ISE tools
- RAM initialization during configuration via
INIT attribute or property
This on-chip memory eliminates the need for many external SRAM components in data-path intensive designs such as packet buffers, shift registers, and embedded lookup tables.
Configuration Modes
The XC4085XLATM-BG432AKP supports multiple configuration methods to fit various system architectures:
| Mode |
Description |
Speed |
| Master Serial |
FPGA drives CCLK; reads bitstream from serial PROM |
Standard |
| Slave Serial |
External source drives CCLK; single-bit data |
Standard |
| Slave Parallel |
Byte-wide data loaded per CCLK cycle |
8× faster than serial |
| Express Mode |
Byte-wide parallel with auto-incrementing address |
Fastest; no CRC checking |
The JTAG interface (IEEE 1149.1) enables boundary-scan testing and in-system programming via TDI/TDO/TMS/TCK pins — supporting field upgrades without physically removing the device from the PCB.
Applications for the XC4085XLATM-BG432AKP
Given its high gate density, robust I/O flexibility, extended temperature rating, and legacy compatibility, the XC4085XLATM-BG432AKP is actively deployed in:
Industrial Automation
Motor control, PLC function replacement, sensor fusion, conveyor and robotics logic controllers requiring long operational life and extended temperature reliability.
Telecommunications & Networking
Protocol handling, framing logic, DSP pre-processing pipelines, and line card logic in telecom equipment with legacy backplane interfaces.
Aerospace & Defense
Radar processing, flight control computers, communication link controllers, and signal processing applications that demand extended temperature ranges and proven device heritage.
Medical Electronics
Imaging pipeline controllers, patient monitoring unit logic, and data acquisition front-ends where device stability and regulatory compliance history matter.
Automotive Electronics
Body control modules, ADAS sensor interface logic, and gateway controllers benefiting from the AKP temperature rating (–40°C to +100°C Tj).
Legacy System Maintenance & Obsolescence Management
Replacing end-of-life PLDs or FPGAs in fielded systems where design re-spin costs are prohibitive and form-fit-function compatibility is required.
Development Tools & Software Support
The XC4085XLATM-BG432AKP is supported by Xilinx legacy development tools:
| Tool |
Version |
Notes |
| Xilinx ISE WebPACK |
14.7 (final release) |
Free; last version supporting XC4000XLA |
| Xilinx ISE Foundation |
Legacy versions |
Full-featured implementation suite |
| XACT / PPR |
Legacy |
Original place-and-route for XC4000 |
| iMPACT |
Included with ISE 14.7 |
JTAG configuration and boundary scan |
Important: Xilinx Vivado Design Suite does not support XC4000XLA devices. Designers must use ISE 14.7 or earlier. The device supports HDL entry via VHDL or Verilog, schematic entry, and synthesis through tools such as Synopsys Design Compiler or Xilinx’s built-in XST synthesizer.
Ordering Information & Part Number Decoder
| Field |
Code |
Meaning |
| Base Device |
XC4085XLA |
XC4000XLA family, ~85K gates |
| Packaging Format |
TM |
Tape & Reel (for automated pick-and-place) |
| Package |
BG432 |
432-ball BGA, 40×40 mm |
| Temperature / Grade |
AKP |
Automotive/Extended: –40°C to +100°C Tj |
Alternative orderable variants in the same device family (BG432 package):
| Part Number |
Speed Grade |
Temperature |
Notes |
| XC4085XLA-07BG432C |
–07 (294 MHz) |
Commercial (0°C – 85°C) |
Fastest speed grade |
| XC4085XLA-08BG432C |
–08 (263 MHz) |
Commercial (0°C – 85°C) |
Standard commercial |
| XC4085XLA-09BG432C |
–09 (227 MHz) |
Commercial (0°C – 85°C) |
Value speed grade |
| XC4085XLA-09BG432I |
–09 (227 MHz) |
Industrial (–40°C – 85°C) |
Industrial range |
| XC4085XLATM-BG432AKP |
TM grade |
AKP (–40°C – 100°C) |
Automotive/Extended |
Frequently Asked Questions (FAQ)
Q: Is the XC4085XLATM-BG432AKP pin-compatible with XC4000XL devices in BG432?
A: Yes. XC4000XLA devices are generally socket-compatible with equivalent XL devices in the BG432 package footprint. However, verify VCCINT pin handling differences before direct substitution.
Q: Can I use Vivado to program this FPGA?
A: No. Vivado does not support XC4000XLA devices. You must use Xilinx ISE 14.7 or an earlier compatible version.
Q: What external PROM is used for configuration?
A: The XC4085XLATM-BG432AKP is compatible with Xilinx serial configuration PROMs (XC17xx series) and external parallel flash devices.
Q: Does this device support partial reconfiguration?
A: The XC4000XLA family does not support partial reconfiguration. The full bitstream must be loaded during each configuration cycle.
Q: What is the JTAG IDCODE for the XC4085XLA?
A: The IDCODE is 0x00238093, with Family Code 01 (XLA) in the identification register.
Q: Is the XC4085XLATM-BG432AKP RoHS compliant?
A: Yes. This part is lead-free and RoHS compliant.
Summary
The XC4085XLATM-BG432AKP is a proven, high-density programmable logic device offering 85,000 system gates, 3,136 CLBs, 352 I/O pins, and an extended automotive-grade temperature range in a surface-mount BGA432 package. Its broad I/O standard support — including 5V TTL, 3.3V LVTTL, and PCI — combined with robust clock management and Select-RAM™ memory make it an enduring choice for industrial, automotive, aerospace, and legacy system applications. Designers seeking a reliable, time-tested FPGA with known heritage and broad community support will find the XC4085XLATM-BG432AKP a capable solution.
