linux-kernel - Re: [RFC] pata

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Message-ID: <adahcrq550y.fsf@cisco.com>
Date:	Mon, 09 Apr 2007 01:24:45 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [RFC] pata_icside driver

 > Lets say that we want to do MW DMA mode 2.  This has the minimum timing
 > of 70ns active, 25ns recovery, 120ns cycle time.
 > 
 > When you quantise those figures using a clock period of 62.5ns (16MHz)
 > you end up with: 2 clocks active (2*62.5 > 70), 1 clock recovery
 > (1*62.5 > 25) and 2 clocks cycle (2*62.5 > 120).
 > 
 > Last time I checked, active + recovery must always be equal to the cycle
 > time, and unless my math is failing me, 2 + 1 does not equal 2.

Do you mean active + recovery must be less than or equal to the cycle
time?  Because 70ns + 25ns does not equal 120ns either...

 - R.
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