User Guide

6255/6255i6256/6256i (RM-19)
Nokia Customer Care Baseband Description and Troubleshooting
Issue 2 05/2005 ©2005 Nokia Corporation Company Confidential Page 33
Figure 21: USB interface block diagram
System
Connector
NUT
Vm
Vp/Frx
VO
FSe0/Ftx
Suspend
RCV
OE#
D+/RXD
D-/TXD
GND
Vcc
VIO
33R
33R
Vbus
D+
D-
GND
Pull_up_en
3.3V
Vreg
TIKUEdge
ARM MCU
System
Vctcxo
System
Vctcxo
SEmode
_Speed
NUT_Fbus
Vsw
1K3
NUT_speed
UEME
Genio #
Genio #
Genio #
Geni o #
USBOEx
USBRCV
USBVM
USBVP_FRX
USBFSE0_FTX
USBVO
220KOhm
USB ASIP
48MHz
DPLL
48MHz
DPLL
W2 FC
VAUX3
VIO
10K
PUENO
GZO
RXDI
RXDMI
RXDPI
SE0O
TXDO
SUSPENDO
PVCI Bus,
IRQs,
DMA control
CLK48I
Zener Diode
ESD Protection
(>8Kv)