Re: [PARPORT] DMA in ECP and EPP mode

From: Fred Barnes (
Date: Fri Apr 20 2001 - 18:27:04 EDT

  • Next message: Tim Waugh: "Re: [PARPORT] DMA in ECP and EPP mode"


    > ECP is much easier to implement with firmware on a microcontroller than is
    > EPP. The ECP timing requirements are much more tolerant of delays. Thus
    > the Linux driver is able to offer a software emulation of ECP, while it
    > cannot emulate EPP in software. It is also easier to implement
    > bi-directional exchanges with ECP. These lower electronics and
    > development costs tend to increase ECP popularity.

    The linux driver can do software emulated EPP, and from what I've seen,
    it's faster than software emulated ECP.

    -- Fred

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