Nintendo Switch Brew - User contributions [en]

Testpads

2024-01-23T08:04:57Z

Andeddokira: /* Cluster G */

The Nintendo Switch mainboard has a series of testpads on the front and back, presumably used in factory test, diagnostics, and early board bringup procedures.

== Raw Logic captures ==

These are reference materials, taken from poking at I/O on various testpads. https://github.com/hedgeberg/Switch-Logic-Captures

== Photos ==

[[File:Switchre_side1.jpg|200px]]
[[File:Switchre_side2.jpg|200px]]

== Pinouts ==

=== Cluster A ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Batt GND? || || || || ||
|-
| 2 || Battery pulse? || Pulse train || 0-3.3V || L-5? || ||
|-
| 3 || Battery Vdd || || || || ||
|-
| 4 || Speaker R + || Square wave || 0-3.3V || || || Speaker Right +
|-
| 5 || Speaker R - || Square wave || 0-3.3V || || || Speaker Right -
|-
| 6 || Weak GND? || || || || ||
|-
| 7 || SDA || I2C || 0-1.8V || || || I2C Port 0
|-
| 8 || SCL || I2C || 0-1.8V || || || I2C Port 0
|-
| 9 || USB-PWR-WAVE? || Square wave || 0-3.3V || K-5 || ~11 Hz || USB CC2
|-
| 10 || USB-PWR-WAVE? || Square wave || 0-3.3V || K-4 || ~11 Hz || USB CC1
|}

=== Cluster B ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || || DBVDD || || || || from ALC5639 pin 43
|-
| 2 || D+ || USB-C || || || || Cluster B - 3
|-
| 3 || D- || USB-C || || || || Cluster B - 2
|-
| 4 || +3.3V || XRST || || || || from M92T36 pin 4
|-
| 5 || +3.3V || VSVR || || || || to M92T36 pin 6, P13USB, CPU, Light sensor, EMMC (Generated by EN IC)
|-
| 5(b) || VUSB || VB || || || || from USB to M92T36 pin 9
|-
| 6 || GND || || || || ||
|}

=== Cluster C ===
The JTAG pins are multiplexed between NV_JTAG and ARM_JTAG by the TRST pin:

* NV_JTAG contains a single TAP (ID 0x221173D7) for boundary scan board verification.
* ARM_JTAG contains two debugging TAPs for CoreSight (ID 0x5BA00477) and BPMP (ID 0x4F1F0F0F).

Note: NV_JTAG and ARM_JTAG are locked out by [[Fuses#Cache|FUSE_ARM_JTAG_DIS]] on production devices.

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || JTAG_TDI || || 0-1.8V || || ||
|-
| 2 || UART1_RX || || 0-1.8V || || || UART-A RX
|-
| 3 || UART1_TX || || 0-1.8V || || || UART-A TX
|-
| 4 || JTAG_TCK || || 0-1.8V || || ||
|-
| 5 || JTAG_RTCK || || 0-1.8V || || || Unused for NV_JTAG
|-
| 6 || UART1_RTS || || 0-1.8V || || || UART-A RTS Flow control
|-
| 7 || JTAG_TDO || || 0-1.8V || || ||
|-
| 8 || UART1_CTS || || 0-1.8V || || || UART-A CTS Flow control
|-
| 9 || JTAG_TMS || || 0-1.8V || || ||
|-
| 10 || JTAG_TRST_N || || 0-1.8V || || || Not a TAP reset; Multiplexes between NV_JTAG (HI) and ARM_JTAG (LO)
|-
| 11 || +1.8V || || 0-1.8V || || ||
|}

=== Cluster D ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 2 || Pwr Rail || || 0v8 || || || CPU Buck
|-
| 3 || Pwr Rail || || 1v15 || || || From PMIC
|-
| 4 || Speaker L + || || || || || Speaker Left +
|-
| 5 || Speaker L - || || || || || Speaker Left -
|}

=== Cluster E ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Vol (+) || || || || || Button Vol (+)
|-
| 2 || Rail || || 1v1 || || || From PMIC
|-
| 10 || Reset || || || || ||
|-
| 11 || Power Button || Pushbutton || 4V-0V || || || Active low
|}

=== Cluster G ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || SD card detect || || || || ||
|-
| 2 || GND || || || || ||
|-
| 3 || Rail || DC || 0v8 || || || GPU Buck
|-
| 4 || Vol(-) || || || || || Button Vol (-)
|-
| 5 || Li-Ion Batt Vdd Mirror || || || || || Power Supply
|-
| 9 || BUTTON_HOME || || || || || RCM strap
|}

=== Cluster H ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || || || || || ||
|-
| 2 || || || || || ||
|-
| 3 || || || || || ||
|-
| 4 || Screen_on || On/Off || 0-1.8v || I-2 || || Screen power state, active high
|-
| 5 || || Flow control || 0-1.8V || I-5 || Flow control for pad I-4? ||
|-
| 6 || || || || || ||
|-
| 7 || || UART || 0-1.8V || I-4 || 1.5MBaud?||
|-
| 8 || || UART || 0-1.8V || I-3 || 1.5MBaud?||
|-
| 9 || || || || || ||
|-
| 10 || || || 5V || H-12 || || Power for JoyCon charge circuit and fan
|-
| 11 || || || || || || Goes to a small ceramic cap near WiFi/BT IC?
|-
| 12 || || || || H-10 || || On the same trace
|}

=== Cluster I ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 2 || Screen_on || On/Off || 0-1.8V || || || Screen power state, active high
|-
| 3 || || UART || 0-1.8V || || 1.5MBaud? || Communication CPU -> Bluetooth using HCI
|-
| 4 || || UART || 0-1.8V || || 1.5MBaud? || Communication Bluetooth -> CPU using HCI
|-
| 5 || || Flow control || 0-1.8V || || || Flow control for pad I-4?
|-
| 6 || || || 0-1.8V || || || Needs testing with chip/touch screen interface board plugged in
|}

=== Cluster J ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || ? || Edge || 0-1.8V || || || Turns on around same time as pad J-3
|-
| 2 || GND || || || || ||
|-
| 3 || ? || Edge || 0-1.8V || || || Turns on around same time as pad J-1, slightly after
|-
| 4 || Power button || Pushbutton || 4V-0V || || || Active low
|-
| 5 || ? || Constant? || 0V || Ground?-NT || ||
|-
| 6 || ? || Edge || 0-1.8V || || || Turns on with pad J-6, ~1s after J-1/J-3
|-
| 7 || ? || Edge || 0-1.8V || || || Turns on with pad J-5, ~1s after J-1/J-3
|-
| 8 || ? || Edge? || 0-1.8V || || || Turns on ~1s after J-6/J-7, turns off at unknown point
|}

=== Cluster K ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 2 || D- || USB-C || || || || Cluster B - 3
|-
| 3 || D+ || USB-C || || || || Cluster B - 2
|-
| 4 || USB-PWR-WAVE? || Square wave || 0V-3.3V || A-10 || ~11 Hz || USB CC2
|-
| 5 || USB-PWR-WAVE? || Square wave || 0V-3.3V || A-9 || ~11 Hz || USB CC1
|-
| 6 || USB-C V+ || Supply power || || || || support fast charger : "normal mode = 5V+" "Fast changer = 12V+"
|-
| 7 || BQ24193 VBUS + M92T36 VEX || Power supply? || ~3V-0V || None known || N/A || 0 when usb-c not plugged in, falls slowly on first interaction if USB-C plugged in. Power draw related?
|}

=== Cluster L ===

TODO: Update diagram

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Li-Ion Batt Vdd Mirror || Power Supply || Std. Li-Ion || || ||
|-
| 2 || GND || || || || ||
|-
| 3 || Li-Ion Batt Vdd || Battery Input || Std. Li-Ion || || ||
|-
| 4 || Mirrored Ground? || || || || || Holds steady @ 0, looks like a decoupled isolated ground
|-
| 5 || Battery pulse? || || || || <1 Hz || Duty cycle ~0%
|-
| 6 || GND || || || || ||
|}

Testpads

2024-01-23T08:04:18Z

Andeddokira: /* Cluster E */

The Nintendo Switch mainboard has a series of testpads on the front and back, presumably used in factory test, diagnostics, and early board bringup procedures.

== Raw Logic captures ==

These are reference materials, taken from poking at I/O on various testpads. https://github.com/hedgeberg/Switch-Logic-Captures

== Photos ==

[[File:Switchre_side1.jpg|200px]]
[[File:Switchre_side2.jpg|200px]]

== Pinouts ==

=== Cluster A ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Batt GND? || || || || ||
|-
| 2 || Battery pulse? || Pulse train || 0-3.3V || L-5? || ||
|-
| 3 || Battery Vdd || || || || ||
|-
| 4 || Speaker R + || Square wave || 0-3.3V || || || Speaker Right +
|-
| 5 || Speaker R - || Square wave || 0-3.3V || || || Speaker Right -
|-
| 6 || Weak GND? || || || || ||
|-
| 7 || SDA || I2C || 0-1.8V || || || I2C Port 0
|-
| 8 || SCL || I2C || 0-1.8V || || || I2C Port 0
|-
| 9 || USB-PWR-WAVE? || Square wave || 0-3.3V || K-5 || ~11 Hz || USB CC2
|-
| 10 || USB-PWR-WAVE? || Square wave || 0-3.3V || K-4 || ~11 Hz || USB CC1
|}

=== Cluster B ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || || DBVDD || || || || from ALC5639 pin 43
|-
| 2 || D+ || USB-C || || || || Cluster B - 3
|-
| 3 || D- || USB-C || || || || Cluster B - 2
|-
| 4 || +3.3V || XRST || || || || from M92T36 pin 4
|-
| 5 || +3.3V || VSVR || || || || to M92T36 pin 6, P13USB, CPU, Light sensor, EMMC (Generated by EN IC)
|-
| 5(b) || VUSB || VB || || || || from USB to M92T36 pin 9
|-
| 6 || GND || || || || ||
|}

=== Cluster C ===
The JTAG pins are multiplexed between NV_JTAG and ARM_JTAG by the TRST pin:

* NV_JTAG contains a single TAP (ID 0x221173D7) for boundary scan board verification.
* ARM_JTAG contains two debugging TAPs for CoreSight (ID 0x5BA00477) and BPMP (ID 0x4F1F0F0F).

Note: NV_JTAG and ARM_JTAG are locked out by [[Fuses#Cache|FUSE_ARM_JTAG_DIS]] on production devices.

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || JTAG_TDI || || 0-1.8V || || ||
|-
| 2 || UART1_RX || || 0-1.8V || || || UART-A RX
|-
| 3 || UART1_TX || || 0-1.8V || || || UART-A TX
|-
| 4 || JTAG_TCK || || 0-1.8V || || ||
|-
| 5 || JTAG_RTCK || || 0-1.8V || || || Unused for NV_JTAG
|-
| 6 || UART1_RTS || || 0-1.8V || || || UART-A RTS Flow control
|-
| 7 || JTAG_TDO || || 0-1.8V || || ||
|-
| 8 || UART1_CTS || || 0-1.8V || || || UART-A CTS Flow control
|-
| 9 || JTAG_TMS || || 0-1.8V || || ||
|-
| 10 || JTAG_TRST_N || || 0-1.8V || || || Not a TAP reset; Multiplexes between NV_JTAG (HI) and ARM_JTAG (LO)
|-
| 11 || +1.8V || || 0-1.8V || || ||
|}

=== Cluster D ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 2 || Pwr Rail || || 0v8 || || || CPU Buck
|-
| 3 || Pwr Rail || || 1v15 || || || From PMIC
|-
| 4 || Speaker L + || || || || || Speaker Left +
|-
| 5 || Speaker L - || || || || || Speaker Left -
|}

=== Cluster E ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Vol (+) || || || || || Button Vol (+)
|-
| 2 || Rail || || 1v1 || || || From PMIC
|-
| 10 || Reset || || || || ||
|-
| 11 || Power Button || Pushbutton || 4V-0V || || || Active low
|}

=== Cluster G ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || SD card detect || || || || ||
|-
| 2 || GND || || || || ||
|-
| 3 || Rail || DC || 0v8 || || || GPU Buck
|-
| 4 || Vol(+) || || || || || Button Vol (+)
|-
| 5 || Li-Ion Batt Vdd Mirror || || || || || Power Supply
|-
| 9 || BUTTON_HOME || || || || || RCM strap
|}

=== Cluster H ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || || || || || ||
|-
| 2 || || || || || ||
|-
| 3 || || || || || ||
|-
| 4 || Screen_on || On/Off || 0-1.8v || I-2 || || Screen power state, active high
|-
| 5 || || Flow control || 0-1.8V || I-5 || Flow control for pad I-4? ||
|-
| 6 || || || || || ||
|-
| 7 || || UART || 0-1.8V || I-4 || 1.5MBaud?||
|-
| 8 || || UART || 0-1.8V || I-3 || 1.5MBaud?||
|-
| 9 || || || || || ||
|-
| 10 || || || 5V || H-12 || || Power for JoyCon charge circuit and fan
|-
| 11 || || || || || || Goes to a small ceramic cap near WiFi/BT IC?
|-
| 12 || || || || H-10 || || On the same trace
|}

=== Cluster I ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 2 || Screen_on || On/Off || 0-1.8V || || || Screen power state, active high
|-
| 3 || || UART || 0-1.8V || || 1.5MBaud? || Communication CPU -> Bluetooth using HCI
|-
| 4 || || UART || 0-1.8V || || 1.5MBaud? || Communication Bluetooth -> CPU using HCI
|-
| 5 || || Flow control || 0-1.8V || || || Flow control for pad I-4?
|-
| 6 || || || 0-1.8V || || || Needs testing with chip/touch screen interface board plugged in
|}

=== Cluster J ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || ? || Edge || 0-1.8V || || || Turns on around same time as pad J-3
|-
| 2 || GND || || || || ||
|-
| 3 || ? || Edge || 0-1.8V || || || Turns on around same time as pad J-1, slightly after
|-
| 4 || Power button || Pushbutton || 4V-0V || || || Active low
|-
| 5 || ? || Constant? || 0V || Ground?-NT || ||
|-
| 6 || ? || Edge || 0-1.8V || || || Turns on with pad J-6, ~1s after J-1/J-3
|-
| 7 || ? || Edge || 0-1.8V || || || Turns on with pad J-5, ~1s after J-1/J-3
|-
| 8 || ? || Edge? || 0-1.8V || || || Turns on ~1s after J-6/J-7, turns off at unknown point
|}

=== Cluster K ===

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || GND || || || || ||
|-
| 2 || D- || USB-C || || || || Cluster B - 3
|-
| 3 || D+ || USB-C || || || || Cluster B - 2
|-
| 4 || USB-PWR-WAVE? || Square wave || 0V-3.3V || A-10 || ~11 Hz || USB CC2
|-
| 5 || USB-PWR-WAVE? || Square wave || 0V-3.3V || A-9 || ~11 Hz || USB CC1
|-
| 6 || USB-C V+ || Supply power || || || || support fast charger : "normal mode = 5V+" "Fast changer = 12V+"
|-
| 7 || BQ24193 VBUS + M92T36 VEX || Power supply? || ~3V-0V || None known || N/A || 0 when usb-c not plugged in, falls slowly on first interaction if USB-C plugged in. Power draw related?
|}

=== Cluster L ===

TODO: Update diagram

{| class=wikitable
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
|-
| 1 || Li-Ion Batt Vdd Mirror || Power Supply || Std. Li-Ion || || ||
|-
| 2 || GND || || || || ||
|-
| 3 || Li-Ion Batt Vdd || Battery Input || Std. Li-Ion || || ||
|-
| 4 || Mirrored Ground? || || || || || Holds steady @ 0, looks like a decoupled isolated ground
|-
| 5 || Battery pulse? || || || || <1 Hz || Duty cycle ~0%
|-
| 6 || GND || || || || ||
|}