Date: Tue, 15 Feb 2005 07:19:01 -0500 (EST)
From: linux-os <linux-os@analogic.com>
Reply-To: linux-os@analogic.com
To: krishna <krishna.c@globaledgesoft.com>
cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: What is the purpose of GPIO pins.
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On Tue, 15 Feb 2005, krishna wrote:

> Hi all,
>
>   Can any one tell me the purpose GPIO pin serves.
>   How are GPIO pins better than dedicated pins, considering hardware design 
> view and for programming view.
>

Do you mean General Purpose I/O bits on a chip?
             ^       ^       ^ ^
If so, it is intended to live in the lower 16 megabytes of
an ix86 machine (higher addresses are not decoded), and at one
time, went to the ISA bus, but is now usually a simple
asynchronous bus off from some bridge.

>From a hardware perspective, it's slow. From a programming
perspective, you don't care where it is.

> Regards,
> Krishna Chaitanya

Cheers,
Dick Johnson
Penguin : Linux version 2.6.10 on an i686 machine (5537.79 BogoMips).
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