N900 Hardware isp1707 - Revision history

speedevil: Redirecting to N900 Hardware USB

2010-05-03T20:06:45Z

← Older revision		Revision as of 20:06, 3 May 2010
Line 1:		Line 1:
-	#~~redirect~~ N900_Hardware_USB	+	#REDIRECT [[N900_Hardware_USB]]

speedevil: Replacing page with '#redirect N900_Hardware_USB'

2010-05-03T20:05:26Z

Replacing page with '#redirect N900_Hardware_USB'

← Older revision		Revision as of 20:05, 3 May 2010
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-	~~The [http://www.nxp.com/ NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html].~~	+	#redirect N900_Hardware_USB
-	~~This rights to this part have been bought by ST-Ericson and some information is [http://www.stericsson.com/sales_marketing_resources/USB_transceiverBR_1.pdf available in a brief marketing sheet].~~	+
-		+
-	~~There is no published datasheet for this chip.~~	+
-	~~It may be available under another name.~~	+
-		+
-	~~The device would normally be switched between host and device mode using the ID pin. This however is not connected externally.~~	+
-		+
-	~~Initially it was claimed that this made USB host mode impossible.~~	+
-		+
-	~~This however seems to be incorrect - it seems on a reading of similar device datasheets that yes, the ID pin is used on hardware that supports it to switch between host and device mode.~~	+
-		+
-	~~But, importantly, the ID pin does nothing directly to the state of the chip. It simply informs the CPU of the state of the ID pin, and leaves the driver to properly configure the chip.~~	+
-		+
-	~~So, if the kernel can be altered to ignore this pin - which should be trivial if there is host mode support for the chip in the kernel - then host mode works.~~	+
-		+
-	~~The current understanding by several people who are working on USB host mode is:~~	+
-		+
-	~~The USB port can supply power - at least 200mA. This is plenty for many devices - mice and keyboards.~~	+
-		+
-	It seems likely that a relatively simple kernel change should enable USB hostmode - http://focus.ti.com/lit/ug/spruf98d/spruf98d.pdf - search for FORCE_HOST - there may well be other cleaner solutions.	+
-		+
-	~~A possibly related errata is detailed at 3.1.3 in [http://focus.ti.com/lit/er/sprz278d/sprz278d.pdf this document] - this, and other erratas may or may not cause issues with implementing host mode.~~	+
-		+
-		+
-	~~[[Category:N900_Hardware]]~~	+

speedevil at 20:50, 2 May 2010

2010-05-02T20:50:41Z

← Older revision		Revision as of 20:50, 2 May 2010
Line 5:		Line 5:
	It may be available under another name.		It may be available under another name.

-	~~One unnamed source claimed~~	+	The device would normally be switched between host and device mode using the ID pin. This however is not connected externally.
-	"	+
-	It is not connected ~~in a way which the direction of the USB port can be reversed~~.	+

-	~~This means~~ that host mode is impossible ~~without hardware modifications~~.	+	Initially it was claimed that this made USB host mode impossible.

-	~~Reportedly connecting pin D3 (ID) to D2 (GND) of the chip will allow direction to be switched.~~	+	This however seems to be incorrect - it seems on a reading of similar device datasheets that yes, the ID pin is used on hardware that supports it to switch between host and device mode.
-		+
-	"	+
-		+
-	This however ~~may~~ be incorrect - it seems on a reading of similar device datasheets that yes, the ID pin is used on hardware that supports it to switch between host and device mode.	+

	But, importantly, the ID pin does nothing directly to the state of the chip. It simply informs the CPU of the state of the ID pin, and leaves the driver to properly configure the chip.		But, importantly, the ID pin does nothing directly to the state of the chip. It simply informs the CPU of the state of the ID pin, and leaves the driver to properly configure the chip.
Line 21:		Line 15:
	So, if the kernel can be altered to ignore this pin - which should be trivial if there is host mode support for the chip in the kernel - then host mode works.		So, if the kernel can be altered to ignore this pin - which should be trivial if there is host mode support for the chip in the kernel - then host mode works.

-	~~--[[User~~:~~speedevil\|speedevil]] 21:21, 11 January 2010 (UTC)~~	+	The current understanding by several people who are working on USB host mode is:
-	~~However~~ - ~~this~~ is ~~a challenging rework job, even~~ for ~~those experienced with SMD soldering,~~ and ~~of course will void the warranty!~~	+
		+	The USB port can supply power - at least 200mA. This is plenty for many devices - mice and keyboards.

		+	It seems likely that a relatively simple kernel change should enable USB hostmode - http://focus.ti.com/lit/ug/spruf98d/spruf98d.pdf - search for FORCE_HOST - there may well be other cleaner solutions.

	A possibly related errata is detailed at 3.1.3 in [http://focus.ti.com/lit/er/sprz278d/sprz278d.pdf this document] - this, and other erratas may or may not cause issues with implementing host mode.		A possibly related errata is detailed at 3.1.3 in [http://focus.ti.com/lit/er/sprz278d/sprz278d.pdf this document] - this, and other erratas may or may not cause issues with implementing host mode.

speedevil at 18:47, 9 March 2010

2010-03-09T18:47:42Z

← Older revision		Revision as of 18:47, 9 March 2010
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	--[[User:speedevil\|speedevil]] 21:21, 11 January 2010 (UTC)		--[[User:speedevil\|speedevil]] 21:21, 11 January 2010 (UTC)
	However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!		However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!
		+
		+
		+	A possibly related errata is detailed at 3.1.3 in [http://focus.ti.com/lit/er/sprz278d/sprz278d.pdf this document] - this, and other erratas may or may not cause issues with implementing host mode.
		+

	[[Category:N900_Hardware]]		[[Category:N900_Hardware]]

speedevil at 21:21, 11 January 2010

2010-01-11T21:21:21Z

← Older revision		Revision as of 21:21, 11 January 2010
Line 5:		Line 5:
	It may be available under another name.		It may be available under another name.

		+	One unnamed source claimed
		+	"
	It is not connected in a way which the direction of the USB port can be reversed.		It is not connected in a way which the direction of the USB port can be reversed.

Line 10:		Line 12:

	Reportedly connecting pin D3 (ID) to D2 (GND) of the chip will allow direction to be switched.		Reportedly connecting pin D3 (ID) to D2 (GND) of the chip will allow direction to be switched.
		+
		+	"
		+
		+	This however may be incorrect - it seems on a reading of similar device datasheets that yes, the ID pin is used on hardware that supports it to switch between host and device mode.
		+
		+	But, importantly, the ID pin does nothing directly to the state of the chip. It simply informs the CPU of the state of the ID pin, and leaves the driver to properly configure the chip.
		+
		+	So, if the kernel can be altered to ignore this pin - which should be trivial if there is host mode support for the chip in the kernel - then host mode works.
		+
		+	--[[User:speedevil\|speedevil]] 21:21, 11 January 2010 (UTC)
	However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!		However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!

	[[Category:N900_Hardware]]		[[Category:N900_Hardware]]

speedevil at 17:31, 5 January 2010

2010-01-05T17:31:39Z

← Older revision		Revision as of 17:31, 5 January 2010
Line 1:		Line 1:
	The [http://www.nxp.com/ NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html].		The [http://www.nxp.com/ NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html].
		+	This rights to this part have been bought by ST-Ericson and some information is [http://www.stericsson.com/sales_marketing_resources/USB_transceiverBR_1.pdf available in a brief marketing sheet].

	There is no published datasheet for this chip.		There is no published datasheet for this chip.

speedevil at 17:16, 5 January 2010

2010-01-05T17:16:03Z

← Older revision		Revision as of 17:16, 5 January 2010
Line 11:		Line 11:
	However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!		However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!

-	[[N900_Hardware]]	+	[[Category:N900_Hardware]]

speedevil: Finish first cut of page on USB PHY.

2010-01-05T16:34:46Z

Finish first cut of page on USB PHY.

← Older revision		Revision as of 16:34, 5 January 2010
Line 1:		Line 1:
-	The [www.nxp.com NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html].	+	The [http://www.nxp.com/ NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html].

	There is no published datasheet for this chip.		There is no published datasheet for this chip.
		+	It may be available under another name.

	It is not connected in a way which the direction of the USB port can be reversed.		It is not connected in a way which the direction of the USB port can be reversed.

	This means that host mode is impossible without hardware modifications.		This means that host mode is impossible without hardware modifications.
		+
		+	Reportedly connecting pin D3 (ID) to D2 (GND) of the chip will allow direction to be switched.
		+	However - this is a challenging rework job, even for those experienced with SMD soldering, and of course will void the warranty!

	[[N900_Hardware]]		[[N900_Hardware]]

speedevil: New page: The [www.nxp.com NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html]. There is no published datasheet for this chip. It is not connected in a...

2010-01-05T16:23:25Z

New page: The [www.nxp.com NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html]. There is no published datasheet for this chip. It is not connected in a...

New page

The [www.nxp.com NXP] isp1707 is used as the USB PHY chip. [http://www.spinics.net/lists/linux-usb/msg25167.html].

There is no published datasheet for this chip.

It is not connected in a way which the direction of the USB port can be reversed.

This means that host mode is impossible without hardware modifications.

[[N900_Hardware]]