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From: Nishanth Menon <menon.nishanth@gmail.com>
To: Aaro Koskinen <aaro.koskinen@nokia.com>
Cc: "Nurkkala Eero.An (EXT-Offcode/Oulu)"
	<ext-Eero.Nurkkala@nokia.com>,
	"r-woodruff2@ti.com" <r-woodruff2@ti.com>,
	"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: tHigh tLow discussion (was [pacth] I2C bug fixes for L-O and L-Z)
Date: Tue, 24 Feb 2009 13:43:14 +0200	[thread overview]
Message-ID: <49A3DD52.4020303@gmail.com> (raw)
In-Reply-To: <49A3B92E.9030101@nokia.com>

Aaro Koskinen said the following on 02/24/2009 11:09 AM:
> ext Nishanth Menon wrote:
>> Oops.. copy-paste typo.. :(
>> tLow = (scll+3) * iclk
>> tHigh = (sclh+9) * iclk
>> Vs:
>> TRM:
>> tHigh  = ( sclh +5 )*iclk period
>> tLow  = ( scll +7 )*iclk period
>>
>> But my question is this: why are we trying to a different equation
>> here compared to the equation in the TRM?
>
> The problem with TRM (the table 18-13 you referred earlier) is that it
> assumes 50% duty cycle while the correct one is more like 33%. This is
> corrected by Eero's patch:
Gentle query - could you point me to the place where the 33% duty cycle
is mentioned in i2c spec? spec mentions minimum timing, but I don't seem
to find a constraint on duty cycle requirement.. :(

Regards,
Nishanth Menon

  parent reply	other threads:[~2009-02-24 11:43 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-16  7:02 [pacth] I2C bug fixes for L-O and L-Z Eero Nurkkala
2009-02-16 14:19 ` Woodruff, Richard
2009-02-17  6:02   ` Eero Nurkkala
2009-02-17  6:22     ` Woodruff, Richard
2009-02-20 20:59       ` Woodruff, Richard
2009-02-23 13:37         ` Eero Nurkkala
2009-02-23 17:01           ` tHigh tLow discussion (was [pacth] I2C bug fixes for L-O and L-Z) Nishanth Menon
2009-02-23 18:10             ` ext-Eero.Nurkkala
2009-02-23 18:19               ` Nishanth Menon
2009-02-23 18:20                 ` ext-Eero.Nurkkala
2009-02-23 18:25                   ` Nishanth Menon
2009-02-23 18:27                     ` ext-Eero.Nurkkala
2009-02-23 18:34                       ` Nishanth Menon
2009-02-23 18:38                         ` ext-Eero.Nurkkala
2009-02-24  9:09                 ` Aaro Koskinen
2009-02-24  9:43                   ` ext-Eero.Nurkkala
2009-02-24 11:43                   ` Nishanth Menon [this message]
2009-02-24 12:47                     ` Aaro Koskinen
2009-02-24 12:57                       ` Woodruff, Richard
2009-02-24 13:17                       ` Woodruff, Richard
2009-02-24 13:23                         ` Pakaravoor, Jagadeesh

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