HwB: ECP Parallel (Tech) Connector

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ECP Parallel (Technical)

This file is designed to give a basic overview of the port found in most newer PC computers called ECP Parallel port.

This file is not intended to be a thorough coverage of the standard. It is for informational purposes only, and is intended to give designers and hobbyists sufficient information to design their own ECP compatible devices.

Signal Descriptions:


This signal is registers data or address into the slave on the assering edge during .

data 0-7

Contains address, data or RLE data. Can be used in both directions.


Valid data driven by the peripheral when asserted. This signal handshakes with nAutoFd in reverse.


This signal deasserts to indicate that the peripheral can accept data. In forward direction this handshakes with nStrobe. In the reverse direction this signal indicates that the data is RLE compressed by being low.


Used to acknowledge a change in the direction of transfer. High=Forward.


Printer is online.


Requests a byte of data from the peripheral when asserted, handshaking with nAck in the reverse direction. In the forward direction this signal indicates whether the data lines contain ECP address or data.


Generates an error interrupt when asserted.


Sets the transfer direction. High=Reverse, Low=Forward.


Low in ECP mode.

Contributor: Joakim Цgren , Email Rob Gill
Source: Microsoft MSDN Library: Extended Capabilities Port Specs
Info: Microsoft MSDN Library
Please send any comments to Joakim Цgren.