[Arm-netbook] Handheld Games Console
gacuest at gmail.com
Wed Sep 23 16:07:44 BST 2015
En 23 de septiembre de 2015 en 16:55:18, Luke Kenneth Casson Leighton (lkcl at lkcl.net) escrito:
> On Wed, Sep 23, 2015 at 2:59 PM, GaCuest wrote:
> > I’m using AirMail. It has plain text editing, but not line-wrap.
> > I will do that manually.
> > I updated the block diagram:
> > http://rhombus-tech.net/community_ideas/games_console/news/pcb_block_diagram_updated2_23sep2015/
> > Anything more to change?
> yes, one thing that's important: 1st USB is mandated to be >= speed
> than 2nd USB. so you need to swap 1st USB with 2nd USB.
> reason: the STM32F is connected to the port that may end up being
> 480mbit/sec and the USB Hub is connected to the port that may end up
> being only 11mbit/sec.
> certainly, for the jz4775 CPU Card (which i am sending off very
> shortly), it *DEFINITELY* has USB 2.0 for the 1st port and *ONLY* USB
> 1.1 for the 2nd.
> and i am certainly not going to increase the cost of the jz4775 CPU
> Card by an extra $2 worth of components to put in a USB2 Hub when the
> SOC itself is only $2.50!!!
I think that you have not properly seen the block diagram.
The STM32 is connected to the second USB, the USB HUB is connected
to the first USB.
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