LPC Debug Port - Revision history

Haxar: Embed LFRAME# reconnection images from external links

2019-10-26T18:47:32Z

Embed LFRAME# reconnection images from external links

Haxar: Move LFRAME# reconnection page to its own section

2019-08-04T22:13:46Z

Move LFRAME# reconnection page to its own section

Dreimer: /* Pins */

2019-08-04T14:06:06Z

‎Pins

KaosEngineer: On v1.6 hardware, added "pin 9 is" for clarity of what's disconnected. Though it is what is being written about

2018-12-24T05:49:43Z

On v1.6 hardware, added "pin 9 is" for clarity of what's disconnected. Though it is what is being written about

Furon at 16:45, 25 May 2018

2018-05-25T16:45:13Z

DarkGabbz at 21:36, 30 April 2018

2018-04-30T21:36:56Z

KaosEngineer: removed parens to match other lines showing 1.6 hardware difference

2018-04-11T20:09:29Z

removed parens to match other lines showing 1.6 hardware difference

KaosEngineer: pin 9 on 1.6 difference noted ( n/c to 3.3Vdc supply voltage)

2018-04-11T20:08:40Z

pin 9 on 1.6 difference noted ( n/c to 3.3Vdc supply voltage)

KaosEngineer: LCLK (2) wrong pin changed to (1)

2018-04-11T20:06:04Z

LCLK (2) wrong pin changed to (1)

KaosEngineer: V1.6 5V always on when AC plugged in. Older revisions this supply voltage was turned on / off with console.

2018-03-17T05:44:22Z

V1.6 5V always on when AC plugged in. Older revisions this supply voltage was turned on / off with console.

@@ Line 42: / Line 42: @@
 == LFRAME# reconnect ==
-It is possible to reconnect this pin on 1.3-1.5 hardware by tapping the MCPX soldermask and soldering a jumper wire to the disconnected pin on the LPC port.
+[[File:LFRAME-for-v1_3-and-up.png|thumb|200px|Disconnected LFRAME# can be reconstructed with via found on all [[MCPX]] revisions]]
-Result should look similar to this in the end: [https://photos.app.goo.gl/wUvAwm3KS3ePSnYj8] (Image provided by dreimer)
+It is possible to reconnect the LFRAME# signal to the LPC port on 1.3-1.5 hardware by tapping the MCPX soldermask and soldering a jumper wire from the via to the disconnected pin on the LPC port.
-In the end, we can gain kernel debug output from Super I/O serial again: [https://cdn.discordapp.com/attachments/603568167255801861/607540322871803904/unknown.png] (Image provided by dreimer)
+Result should look similar to this:
-This reconnection was tested on 1.3 hardware, and should work on 1.4 and 1.5 revisions, as the MCPX is the same.
+[[File:Dreimer-lframe-v1-3-reconnect.jpg|500px|Image provided by dreimer]]
 == References ==
 * [https://web.archive.org/web/20140805105234/http://dwl.xbox-scene.com/~xbox/xbox-scene/tutorials/LFRAME-for-v1_3-and-up.pdf LFRAME-for-v1_3-and-up.pdf] An old manual from Xbox-Scene that explains how to reconnect '''LFRAME#''' (3) for a Cheapmod. This we don't care about, but is what we want for [[Kernel_Debug|kernel debugging]] via [[Super_I/O|Super I/O]]. Thanks to dreimer for finding and testing this documentation.

@@ Line 35: / Line 35: @@
 * '''LRESET#''' (5) - LPC reset signal; same as PCIRST#.
 * '''PWR''' (4) - On pre-1.6 hardware, this pin does not physically exist. On 1.6 hardware, this pin is connected to the power button. Shorting it to ground will turn the Xbox on and off.
-* '''LFRAME#''' (3) - LPC start-of-cycle signal. On 1.3-1.5 hardware, disconnected. Can be reconnected though. ([[LFRAME# reconnect]])
+* '''LFRAME#''' (3) - LPC start-of-cycle signal. On 1.3-1.5 hardware, this pin is disconnected. See [[LPC_Debug_Port#LFRAME.23_reconnect|LFRAME# reconnect]] for a possible reconnection.
 * '''LCLK''' (1) - 33MHz LPC clock signal; same as PCICLK.
 The debug port lacks the optional LDRQ#, SERIRQ, CLKRUN#, PME#, LPCPD#, and LSMI# signals. This means peripherals connected to the debug port cannot utilize interrupt, DMA, bus mastering, or power management features.

@@ Line 35: / Line 35: @@
 * '''LRESET#''' (5) - LPC reset signal; same as PCIRST#.
 * '''PWR''' (4) - On pre-1.6 hardware, this pin does not physically exist. On 1.6 hardware, this pin is connected to the power button. Shorting it to ground will turn the Xbox on and off.
-* '''LFRAME#''' (3) - LPC start-of-cycle signal. On 1.3-1.5 hardware, disconnected.
+* '''LFRAME#''' (3) - LPC start-of-cycle signal. On 1.3-1.5 hardware, disconnected. Can be reconnected though. ([[LFRAME# reconnect]])
 * '''LCLK''' (1) - 33MHz LPC clock signal; same as PCICLK.
 The debug port lacks the optional LDRQ#, SERIRQ, CLKRUN#, PME#, LPCPD#, and LSMI# signals. This means peripherals connected to the debug port cannot utilize interrupt, DMA, bus mastering, or power management features.

@@ Line 27: / Line 27: @@
 == Pins ==
-* '''3.3V''' (15 & 9) - Provides 3.3V while the Xbox is powered on. On 1.6 hardware, disconnected reconnect to pin 15 to restore supply voltage.
+* '''3.3V''' (15 & 9) - Provides 3.3V while the Xbox is powered on. On 1.6 hardware, pin 9 is disconnected. Reconnect to pin 15 to restore the supply voltage.
 * '''SDA''' (14) - [[SMBus]] data and address signal.
 * '''SCL''' (13) - [[SMBus]] clock signal.

@@ Line 4: / Line 4: @@
 ! style="text-align:right" | Name !! style="text-align:right" | Pin !! Pin !! Name
 |-
-| style="text-align:right" | - || style="text-align:right" | 16 || 15 || 3.3V
+| style="text-align:right" | SERIRQ (v1.0) || style="text-align:right" | 16 || 15 || 3.3V
 |-
 | style="text-align:right" | SDA || style="text-align:right" | 14 || 13 || SCL

@@ Line 32: / Line 32: @@
 * '''GND''' (12 & 2) - Ground.
 * '''LAD[3:0]''' (11, 10, 8, 7) - LPC address and data signals.
-* '''5V''' (6) - Provides 5V while the Xbox is plugged in.
+* '''5V''' (6) - Provides 5V while the Xbox is powered on or v1.6 always on when AC plugged in.
 * '''LRESET#''' (5) - LPC reset signal; same as PCIRST#.
 * '''PWR''' (4) - On pre-1.6 hardware, this pin does not physically exist. On 1.6 hardware, this pin is connected to the power button. Shorting it to ground will turn the Xbox on and off.