3. TECHNICAL BRIEF
- 29 -
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Figure. 3.4.2 Crystal Oscillator External Connection
3.4 Clocks
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
/ 131
3.4 Clocks
Figure. 3.4.2 Crystal Oscillator External Connection
3. TECHNICAL BRIEF
30
MT6255
There are two major time bases in the MT6255. For the faster one is the 26 MHz clock originated from the
digital control oscillator(DCXO) of RF block. This is then converted to the square-wave signal through
CLKSQ.
The other time base is the 32768 Hz clock generated by an on-chip oscillator connected to an external
crystal.
Figure. 3.4.1 Clock distributions inside the MT6255.
26MHz
DCXO
CLKSQ
1/2
1/2
MPLL
UPLL
XOSC_ANA
32KHz
0
1
0
1
0
1
0
1
0
1
0
1
0
2
3
0
2
3
CLKSQ_26M_CK
CLKSQ_DIV2_MCU_SEL0
(Cx8300_0100[0])
CLKSQ_DIV2_MCU_SEL0
(Cx8300_0100[1])
CLKSQ_DIV2_GSM_SEL0
(Cx8300_0100[2])
CLKSQ_DIV2_USB_SEL0
(Cx8300_0100[3])
UPLL_SEL
(Cx8300_0204[5])
GPLL_SEL
(Cx8300_0204[4])
DPLL_SEL
(Cx8300_0204[3:2])
MPLL_SEL
(Cx8300_0204[1:0])
MPLL_113M_CK
PLL_CON0(Cx8300_0200)
PLL_CON1(Cx8300_0204)
CLKSQ_CON (Cx8300_0100)
MPLL_CON0(Cx8300_0210)
MPLL_CON1(Cx8300_0214)
UPLL_CON0(Cx8300_0208)
UPLL_CON1(Cx8300_020C)
UPLL_104M_CK
UPLL_48M_USB_CK
USB_PHY_CLK
F32k_CK
F48M_CK
FUSB_CK
FGSM_CK
FDSP_CK
FMCU_CK
MCV_DCM
DSP_DCM
GSM_DCM
USB_DCM
MSDC_DCM
SLOW_DCM
EN
CG
EN
CG
EN
CG
EN
CG
EN
CG
EN
CG
104MHz EMI clock
104MHz AHB clock
52MHz AHB clock
52MHz APB clock
10MHz GDSP1_CK
10MHz GDSP2_CK
52MHz GGSM_CK
GUSB_CK
SLOW_CK
52MHz BFE_clock
MSDC_clock
IrDA_clock
UPLL_48M_IRDA_CK
XOSOOUT
XOSQ_CON (Cx8300_0000)
USB PHY
C15
A15
B15
AB1
1
AC11
AB1
0
AC10
AB1
4
AB1
2
U14
V1
4
AA1
3
Y1
3
B1
1
F1
1
C11
B1
2
G1
0
A1
2
BPI_BUS
0
BPI_BUS
1
BPI_BUS
2
BPI_BUS
3
BPI_BUS
4
BPI_BUS
5
RF2G_N_B
T
RF2G_P_B
T
TRXIQ_P_BT TRXIQ_N_B
T
RBIAS_BT VCO_MONITOR_B
T
LNA_IN_P_F
M
LNA_IN_N_F
M
SALNA_IN_P_F
M
SALNA_IN_N_F
M
XOUT
XIN
TESTMODE
X102
FC-135
32.768KHz
2
1
22p
C145
1
2
22p
C144
1
2
DVDD28_IO
(VIO_2V8)
MT6255