Editing N900 Hardware USB

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===The Circuit===
===The Circuit===
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* The SoC has the USB protocol controller - this is the 'high level' controller - it implements most of the USB protocol. This is a [http://www.mentor.com/products/ip/usb/usb20otg/ Mentorgrafix MUSBMHDRC-core] IntelectualProperty function block licenced for the OMAP.
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* The SoC has the USB protocol controller - this is the 'high level' controller - it implements most of the USB protocol. This is a [http://www.mentor.com/products/ip/usb/usb20otg/ Mentorgrafix MUSB-core] IntelectualProperty function block licenced for the OMAP.
* The PHY (physical layer) chip connects to the world through the USB socket. This is not the normal companion chip - but the NXP part, and is connected to the SoC via a standard ULPI interface. It does the very lowest level USB hardware protocol. Also it detects chargers (by sensing D+/D- short). It also has a connection to VBUS, via a 1k resistor, to do certain probing.
* The PHY (physical layer) chip connects to the world through the USB socket. This is not the normal companion chip - but the NXP part, and is connected to the SoC via a standard ULPI interface. It does the very lowest level USB hardware protocol. Also it detects chargers (by sensing D+/D- short). It also has a connection to VBUS, via a 1k resistor, to do certain probing.
* The [[N900 Hardware Battery Charger|bq24150a Battery charger]]. This is connected to the battery, and the PHY chip, as well as to the SoC though I2C. It handles (with the PHY chip) charging from dead. It also implements boost mode, to enable powering things through the USB socket. Of course it detects when external VBUS is applied.
* The [[N900 Hardware Battery Charger|bq24150a Battery charger]]. This is connected to the battery, and the PHY chip, as well as to the SoC though I2C. It handles (with the PHY chip) charging from dead. It also implements boost mode, to enable powering things through the USB socket. Of course it detects when external VBUS is applied.

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