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All chip parts / designators from a C/NTR-CPU-01 board
Chips U1-U12

Designation: U1
Silkscreen: NTR-CPU
Package: Evil BGA package
Purpose: Main CPU / Sub CPU / 2D cores / 3D core / Various memories / BIOSes
Chip Text:


0437 4m
CPU NTR
(M)(C)2004
Nintendo
Japan ARM


Designation: U2
Silkscreen: NTR-SRAM
Package: BGA 48
Purpose: 2M x 16 PSRAM
Chip Text:


ST M69AB048
BL70ZA8
AA2AS 9
FWN 99 437


Designation: U3
Silkscreen: ?
Package: 64 pin QFP (T?)
Purpose: Power management
Chip Text:


MITSUMI
  JAPAN
    438
  3152A


Designation: U4
Silkscreen: RTC
Package: Insanely small 8 pin
Purpose: Real Time Clock
Chip Text:


110
408
458


Designation: U5
Silkscreen: NTR-RFU
Package: Custom shielded (approx. 32 pins)
Purpose: 802.11b Radio modem

Designation: U6
Package: 16 pin SOIC
Purpose: Low Voltage I/O Touch Screen Controller
Chip Text:


TI TSC
2046I
48MXNK5


or for EUR version:


AKM
4148AVT
ON439


Designation: U7 Package: 6 pin (5 actually, missing middle left pin)
Location: Unknown
Purpose: Unknown
Chip Text:




Designation: U8
Package: 6 pin (5 actually, missing middle left pin)
Location: Left edge of back
Purpose: Unknown
Chip Text:


KEG


Designation: U9
Package: 6 pin (5 actually, missing middle left pin)
Location: Left edge of back
Purpose: Unknown
Chip Text:


KER


Designation: U10
Package: 6 pin (5 actually, missing middle left pin)
Location: Left edge of back
Purpose: Unknown
Chip Text:


KER


Designation: U11
Package: 6 pin (3 actually, missing two on one side, and one on the other)
Location: Above ABXY button cluster
Purpose: Magnetic sensor
Chip Text:


W672
45KL


Designation: U12
Package: 8 pin SOIC narrow
Location: Below ABXY button cluster
Purpose: Dual 250 mW Audio Power Amplifier with Shutdown Mode
Chip Text:


45RF (maybe, can't read this line well)
LM
4880M


Connectors

Designation: P1
Purpose: GBA cartridge slot

Designation: P2
Purpose: DS card slot
Crystal (oscillator)

Designation: X1
Value: 16.756 MHz
Purpose: Main time base
Chip Text: D164J

Designation: X2
Value: 32.768 KHz
Purpose: RTC time base
Chip Text:


32.768
KDS0438


RFU

Package: 48 pin
Purpose:
Chip Text:


MITSUMI
 JAPAN
   437
MM3155


Package: 8 pin
Purpose: Firmware EEPROM
Chip Text:


25FW203T
  4KU20


(first 256 pages of 256 bytes can be protected) or


ST
45PE20P
 94400


(first 512 bytes can be protected)

PCB (inferred) Nomenclature:

   * SL = Short Line (normally open, short for special behavior)
         o SL1 = Short to disable write protection on Firmware 
   * CL = Cut Line (normally closed, cut for special behavior)
   * VDDx = Voltage x
         o VDD5, VDD3.3, VDD1.5, VDD1.8, VDD-10, VDD-5, VDD15, VDD10 
   * Pxx = Pin? xx (goes to keys register, i.e. P00 is bit 0)
         o P00, P01, P02, P03, P04, P05, P06, P07, P08, P09 
   * Rxx = Retarded? xx (goes to arm7 R reg, e.g. X/Y/penirq)
         o R00, R01, ? 
   * LDR0..LDR5, LDG0..LDG5, LDB0..LDB5 - RGB lcd data, dunno which is MSB
   * BT+ / BT-: battery terminals
   * PWSW - power switch
   * AD0..AD15, A16..A23 - GBA cart address bus
   * PHI - GBA cart configurable clock terminal
   * IRQ - GBA cart irq line
   * CLKB-MC - DS card ROM CLK
   * CSB-MC - DS card ROM /CS line
   * RESB-MC - DS card reset line
   * CSB-MC2 - DS card SPI /CS line
   * IREQ-MC - DS card irq line
   * I/O0..I/07 - DS card data bus (SPI data bus shared here)
   * RST -
   * lots more 


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