Power Rails (Original): Difference between revisions

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The [[Original Xbox 360]]'s [[motherboard]] has various rails which power components of the system.
The [[Original Xbox 360]]'s [[motherboard]] has various rails which power components of the system.
This page applies to the [[Xenon (Motherboard)|Xenon]], [[Zephyr]], [[Falcon]], [[Elpis (Motherboard)|Elpis]], [[Jasper]], and [[Tonasket]] motherboards.
== Standby Power ==
==== V_1P8STBY ====
* Voltage: 1.8V
* Source: [[#V_5P0STBY|V_5P0STBY]]
==== V_3P3STBY ====
* Voltage: 3.3V
* Source: [[#V_5P0STBY|V_5P0STBY]]
==== V_5P0STBY ====
* Voltage: 5V
* Source: [[Power Supply]]


== Main Power ==
== Main Power ==
Line 8: Line 24:
* Voltage: 12V
* Voltage: 12V
* Source: [[Power Supply]]
* Source: [[Power Supply]]
* Purpose: Full-On System Power
* Multipurpose System Power
 
==== V_1P8 ====
* Voltage: 1.8V
* Source: [[#V_5P0|V_5P0]] or tied to [[#V_MEM|V_MEM]]
* Multipurpose System Power
 
==== V_3P3 ====
* Voltage: 3.3V
* Source: [[#V_12P0|V_12P0]]
* Multipurpose System Power
 
==== V_5P0 ====
* Voltage: 5V
* Source: [[#V_12P0|V_12P0]]
* Multipurpose System Power
 
==== V_5P0DUAL ====
* Voltage: 5V
* Source: [[#V_5P0|V_5P0]] or [[#V_5P0STBY|V_5P0STBY]], controlled by [[SMC]]
* Purpose: USB Port Power


==== V_CPUCORE ====
==== V_CPUCORE ====
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* Source: [[#V_12P0|V_12P0]]
* Source: [[#V_12P0|V_12P0]]
* Purpose: [[CPU]] Power
* Purpose: [[CPU]] Power
==== V_CPUPLL ====
* Voltage: 1.8V
* Source: [[#V_3P3|V_3P3]] or tied to [[#V_1P8|V_1P8]]
* Purpose: [[CPU]] PLL Power
==== V_CPUVCS ====
* Voltage: 1.32-1.68V, controlled by [[CPU]] via APS (CPU VID * 1.2)
* Source: [[#V_5P0|V_5P0]]
* Purpose: [[CPU]] VCS Power
* Not present on [[Xenon (Motherboard)|Xenon]], [[Zephyr]], and [[Elpis (Motherboard)|Elpis]]
==== V_EFUSE ====
* Voltage: 3.5V
* Source: [[#V_5P0|V_5P0]]
* Purpose: [[CPU]] [[eFUSE]] Power


==== V_GPUCORE ====
==== V_GPUCORE ====
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* Purpose: [[GPU]] and [[eDRAM]] Power
* Purpose: [[GPU]] and [[eDRAM]] Power


==== V_CPUVCS ====
==== V_GPUPCIE ====
* Voltage: 1.32-1.68V, controlled by [[CPU]] via APS (CPU VID * 1.2)
* [[Xenon (Motherboard)|Xenon]], [[Zephyr]], [[Falcon]], and [[Elpis (Motherboard)|Elpis]]
** Voltage: 1.25V
** Source: [[#V_3P3|V_3P3]]
* [[Jasper]] and [[Tonasket]]
** Voltage: 1.075
** Source: Tied to [[#V_GPUCORE|V_GPUCORE]] ([[Jasper]] and [[Tonasket]])
* Purpose: [[GPU]] [[PCIe]] Power
 
==== V_MEM ====
* [[Xenon (Motherboard)|Xenon]], [[Zephyr]], [[Falcon]], and [[Elpis (Motherboard)|Elpis]]
** Voltage: 1.9-2.1V, controlled by strapping depending on [[RAM]] type
* [[Jasper]] and [[Tonasket]]
** Voltage: 1.8V
* Source: [[#V_12P0|V_12P0]]
* Purpose: [[RAM]] Power
 
==== V_MPORT ====
* Voltage: 3.3V
* Source: [[#V_5P0|V_5P0]]
* Source: [[#V_5P0|V_5P0]]
* Purpose: [[CPU]] VCS Power
* Purpose: [[Memory Unit]] Port Power
* Not present on [[Xenon (Motherboard)|Xenon]], [[Elpis (Motherboard)|Elpis]], and [[Zephyr]]
 
==== V_SBPCIE ====
* Voltage: 1.87V
* Source: [[#V_3P3|V_3P3]]
* Purpose: [[Southbridge]] [[PCIe]] Power


{{Motherboard Components}}
{{Motherboard Components}}

Latest revision as of 20:39, 16 June 2023

For Xbox 360 S and Xbox 360 E, see Power Rails (S/E).

The Original Xbox 360's motherboard has various rails which power components of the system.

This page applies to the Xenon, Zephyr, Falcon, Elpis, Jasper, and Tonasket motherboards.

Standby Power

V_1P8STBY

V_3P3STBY

V_5P0STBY

Main Power

V_12P0

V_1P8

  • Voltage: 1.8V
  • Source: V_5P0 or tied to V_MEM
  • Multipurpose System Power

V_3P3

  • Voltage: 3.3V
  • Source: V_12P0
  • Multipurpose System Power

V_5P0

  • Voltage: 5V
  • Source: V_12P0
  • Multipurpose System Power

V_5P0DUAL

V_CPUCORE

  • Voltage: 1.1-1.4V, controlled by CPU via APS
  • Source: V_12P0
  • Purpose: CPU Power

V_CPUPLL

  • Voltage: 1.8V
  • Source: V_3P3 or tied to V_1P8
  • Purpose: CPU PLL Power

V_CPUVCS

  • Voltage: 1.32-1.68V, controlled by CPU via APS (CPU VID * 1.2)
  • Source: V_5P0
  • Purpose: CPU VCS Power
  • Not present on Xenon, Zephyr, and Elpis

V_EFUSE

V_GPUCORE

  • Voltage: 1.075-1.150V, controlled by VID strapping
  • Source: V_12P0
  • Purpose: GPU and eDRAM Power

V_GPUPCIE

V_MEM

V_MPORT

V_SBPCIE


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