A395C - ECL Output Expansion
32-channel ECL output expansion board for V2495. Drives external equipment with differential ECL signals from the FPGA logic.
Introduction
The A395C is an expansion board for the V2495 that provides 32 ECL output channels. It can be installed in expansion slots D, E, or F of the V2495 mainboard.
From the FPGA perspective, this board drives external signals. The 32 channels appear as inputs to the block (receiving data from your logic design) plus an Output Enable (OE) control.
Product link: CAEN A395C
Pin Description
Output Enable control.
- HIGH (1): The P/N terminals drive the INx values
- LOW (0): The P/N terminals are in three-state (high-Z)
Use this to control when the outputs are active.
Input signals from FPGA logic (32 total). Each channel is a 1-bit signal to be driven to the external output.
Connect your logic outputs to drive the ECL differential pairs.
Properties
Select the socket hosting the expansion board
Selects the expansion socket where the A395C is installed. Available options: D, E, F. Must match the physical installation location on the V2495 mainboard.Default: D
Options: D E F
Usage
Signal Direction
The A395C is an output expansion - it drives signals to external equipment via ECL differential pairs. From the SciCompiler perspective:
┌──────────────────────────────────────────────────────────────────┐
│ A395C Signal Flow │
│ │
│ ┌─────────────┐ ┌─────────────┐ External │
│ │ FPGA │ │ │ Equipment │
│ │ Logic │═══► IN0-IN31 ═══►│ A395C │═══► │
│ │ │ │ (32 ch) │ ECL │
│ │ │═══► OE ─────────►│ │ Signals │
│ └─────────────┘ └─────────────┘ │
└──────────────────────────────────────────────────────────────────┘
Output Enable (OE)
The OE (Output Enable) pin controls the output driver state:
| OE State | Behavior |
|---|---|
| HIGH (1) | Outputs are driven with INx values |
| LOW (0) | Outputs are in three-state (high impedance) |
Expansion Socket Selection
The A395C can be installed in one of three expansion sockets:
| Socket | Description |
|---|---|
| D | Expansion slot D |
| E | Expansion slot E |
| F | Expansion slot F |
Select the appropriate socket during block creation to match the physical installation.
Signal Characteristics
| Parameter | Value |
|---|---|
| Channels | 32 |
| Signal type | ECL (differential) |
| Direction | Output from V2495 |
| Output control | Three-state via OE |
A395B vs A395C
| Feature | A395B | A395C |
|---|---|---|
| Output standard | LVDS | ECL |
| Channels | 32 | 32 |
| OE control | Yes | Yes |
Choose based on your external equipment requirements.
Resources & Timing
-
Latency: Minimal (output buffer delay only)
-
Throughput: 32 channels at FPGA clock rate
- ECL differential output standard
- Three-state control via OE pin
- Each channel independently driven from FPGA
Supported Boards
- V2495