Difference between revisions of "Testpads"

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Line 33: Line 33:
 
| 8 || SCL || 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-4, K-5? || ~11 Hz || USB CC2
+
| 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, K-5? || ~11 Hz || USB CC1
+
| 10 || USB-PWR-WAVE? || Square wave || 0-3.3V || K-4 || ~11 Hz || USB CC1
 
|}
 
|}
  
Line 51: Line 51:
 
| 4 || +3.3V || XRST || || || || from M92T36 pin 4
 
| 4 || +3.3V || XRST || || || || from M92T36 pin 4
 
|-
 
|-
−
| 5 || +3.3V || VSVR || || || || from M92T36 pin 6
+
| 5 || +3.3V || VSVR || || || || to M92T36 pin 6, P13USB, CPU, Light sensor, EMMC (Generated by EN IC)
 
|-
 
|-
−
| 5(b) || VUSB || VB || || || || from M92T36 pin 9
+
| 5(b) || VUSB || VB || || || || from USB to M92T36 pin 9
 
|-
 
|-
 
| 6 || GND ||  || || || ||  
 
| 6 || GND ||  || || || ||  
Line 99: Line 99:
 
| 1 || GND || || || || ||
 
| 1 || GND || || || || ||
 
|-
 
|-
−
| 4 || Seaker L + || || || || || Speaker Left +
+
| 2 || Pwr Rail || || 0v8 || || || CPU Buck
 
|-
 
|-
−
| 5 || Seaker L - || || || || || Speaker Left -  
+
| 3 || Pwr Rail || || 1v15 || || || From PMIC
 +
|-
 +
| 4 || Speaker L + || || || || || Speaker Left +
 +
|-
 +
| 5 || Speaker L - || || || || || Speaker Left -  
 
|}
 
|}
  
Line 109: Line 113:
 
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
 
! Pad # || Name || Type || Levels || Continuity || Frequency || Comment
 
|-
 
|-
−
| 1 || Vol (-)  || || || || || Button Vol (-)
+
| 1 || Vol (+)  || || || || || Button Vol (+)
 +
|-
 +
| 2 || Rail  || || 1v1 || || || From PMIC
 
|-
 
|-
 
| 10 || Reset || || || || ||
 
| 10 || Reset || || || || ||
Line 127: Line 133:
 
| 3 || Rail || DC || 0v8 || || || GPU Buck
 
| 3 || Rail || DC || 0v8 || || || GPU Buck
 
|-
 
|-
−
| 4 || Vol(+) || || || || || Button Vol (+)
+
| 4 || Vol(-) || || || || || Button Vol (-)
 
|-
 
|-
 
| 5 || Li-Ion Batt Vdd Mirror || || || || || Power Supply
 
| 5 || Li-Ion Batt Vdd Mirror || || || || || Power Supply
Line 215: Line 221:
 
| 3 || D+ || USB-C || || || || Cluster B - 2
 
| 3 || D+ || USB-C || || || || Cluster B - 2
 
|-
 
|-
−
| 4 || USB-PWR-WAVE? || Square wave || 0V-3.3V || A-9, A-10? || ~11 Hz ||
+
| 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, A-10? || ~11 Hz || Appears to mirror K4. Duty cycle 66.67%. Low on screen lock. Off until first interaction.
+
| 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+"  
 
| 6 || USB-C V+ || Supply power || || || || support fast charger : "normal mode = 5V+"  "Fast changer = 12V+"  

Latest revision as of 09:04, 23 January 2024

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

Switchre side1.jpg Switchre side2.jpg

Pinouts

Cluster A

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

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 FUSE_ARM_JTAG_DIS on production devices.

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

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

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

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

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

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

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

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

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
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