On 19 Apr, Tim Waugh wrote:
> On Wed, Apr 18, 2001 at 11:06:15PM +0200, Tommy Kjellqvist wrote:
>
>> Whitch mode can be expected to deliver the highest performance?
>
> It depends on your application, I think. ECP seems to be quite
> popular for newer devices though.
>
>> Is there any important differences between the two modes except the
>> fact that when transfering data from a peripherial to the host using
>> ECP the peripherial initiate the transfer?
>
> Well, they are just different protocols. With both modes the
> peripheral gets to say whether it has data to transfer, AFAIR.
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.
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This archive was generated by hypermail 2b29 : Fri Apr 20 2001 - 17:52:44 EDT