Acromag / Xembedded / Xycom PMC-DX2003 Reconfigurable FPGA with TTL and Differential I/O Module

The Acromag/Xembedded/Xycom PMC-DX2003 is a reconfigurable FPGA module built around a Xilinx Virtex-II XC2V2000 FPGA with 24,192 logic cells. It delivers high-speed digital I/O via 16 bidirectional TTL channels and 24 bidirectional RS422/485 differential channels, all configurable through downloadable FPGA code. The module implements a 32-bit PCI Master interface via PLX PCI 9056 at 66 MHz, dual-channel DMA support, and onboard 256K × 36-bit SRAM.

Configuration loads via PCI bus or flash memory. Direction control, interrupt handling, and signal routing are fully programmable in VHDL using Xilinx tools.

Technical Specifications

• Xilinx Virtex-II XC2V2000 with 24,192 logic cells


• Configuration via PCI bus or onboard flash memory


• 256K × 36-bit SRAM for direct FPGA access PCI Interface


• PCI Local Bus Specification Revision 2.2


• 32-bit PCI Master (PLX PCI 9056)


• 66 MHz clock frequency


• 5V and 3.3V signaling compliance


• Dual-channel DMA support TTL I/O (16 Bidirectional Channels)


• Input voltage range: 0 to 5V DC


• Input thresholds: 3.5V typical (low-to-high), 1.5V typical (high-to-low)


• Input response time: 10 ns typical


• Output voltage range: 0 to 5V DC


• Output current: −32 to +32 mA


• Output turn-on/off time: 10 ns


• 4.7 kΩ socketed pullup resistors


• Direction controlled as signal pairs or two-channel groups; defaults to input on power-up Differential I/O (24 Bidirectional RS422/485 Channels)


• Driver output voltage (50 Ω load): 2V to 5V


• Common mode output voltage: 3V maximum


• Input impedance: 12 kΩ minimum


• 120 Ω termination resistor networks (socketed)


• Independent per-channel or 4-channel group direction control


• Rear I/O models support 23 channels Interrupts


• 8 channels, software programmable


• Trigger modes: high-to-low, low-to-high, or any change-of-state

Key Features

• Single-width PMC form factor with front or rear I/O connector options


• Fully reconfigurable digital logic via FPGA bitstream download


• Mixed-signal I/O: TTL for short-range, differential for long-distance transmission


• Example VHDL code provided for PCI, SRAM, PLL, and I/O control


• Programmable interrupt generation on state transitions

Typical Applications

• Hardware simulation and in-circuit diagnostics


• Communication protocol translation and bridging


• High-speed custom digital signal processing


• Real-time data acquisition with flexible I/O routing

Compatibility & Integration Designed for PCI-based embedded systems. Xilinx design tools and VHDL proficiency required for custom logic implementation.