From: <Eugen.Hristev@microchip.com>
To: <Tudor.Ambarus@microchip.com>
Cc: <u-boot@lists.denx.de>, <Mihai.Sain@microchip.com>
Subject: Re: [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines
Date: Wed, 27 Apr 2022 06:08:43 +0000 [thread overview]
Message-ID: <1ea58951-7fd2-88df-e0ba-e005e6e55856@microchip.com> (raw)
In-Reply-To: <20220408091036.749648-1-tudor.ambarus@microchip.com>
On 4/8/22 12:10 PM, Tudor Ambarus wrote:
> The impedance of the QSPI PCB lines on the sama7g5ek is 50 Ohms.
> Align the output impedance of the QSPI0 HSIOs by setting a medium drive
> strength which corresponds to an impedance of 56 Ohms when VDD is in the
> 3.0V - 3.6V range. The high drive strength setting corresponds to an
> output impedance of 42 Ohms on the QSPI0 HSIOs.
> This is just a fine tunning. The memory that we have populated on sama7g5ek
> works fine even with high drive strength, but it's better to adjust it and
> use medium instead, in case some other flashes with higher frequencies are
> tested.
>
> Suggested-by: Mihai Sain <mihai.sain@microchip.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
> ---
Applied to u-boot-at91/master, thanks !
next prev parent reply other threads:[~2022-04-27 6:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-08 9:10 [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines Tudor Ambarus
2022-04-27 6:08 ` Eugen.Hristev [this message]
-- strict thread matches above, loose matches on Subject: below --
2022-04-06 13:05 Tudor Ambarus
2022-04-06 13:05 ` Tudor Ambarus
2022-04-07 6:26 ` Claudiu.Beznea
2022-04-07 6:26 ` Claudiu.Beznea
2022-04-07 7:51 ` Tudor.Ambarus
2022-04-07 7:51 ` Tudor.Ambarus
2022-04-07 8:24 ` Claudiu.Beznea
2022-04-07 8:24 ` Claudiu.Beznea
2022-04-13 12:40 ` Nicolas Ferre
2022-04-13 12:40 ` Nicolas Ferre
2022-04-13 12:43 ` Nicolas Ferre
2022-04-13 12:43 ` Nicolas Ferre
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