Re: [PARPORT] DMA in ECP and EPP mode

From: Tim Waugh (tim@cyberelk.demon.co.uk)
Date: Sat Apr 21 2001 - 05:02:16 EDT

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On Fri, Apr 20, 2001 at 05:47:24PM -0400, rjh@world.std.com wrote:

> 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.

[Er, actually, it tries. Take a look in ieee1284_ops.c.]

Tim.
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