MOTOROLA CONFIDENTIAL - PROPRIETARY
6881036B20
November 20, 2000
17
Level 3 Service Manual
Circuit Description
13 MHz clock. Initially, upon power being applied to the Magic IC, crystal
Y200
(supported by CRYSTAL_BASE (Magic IC
Pin E1
)) emits a 26 MHz signal to the
Magic IC. The 26 MHz signal is internally divided by two, to produce the external
13MHz clock. The 13 MHz clock is then fed out of the Magic IC on
Pin J6
Magic
IC_13MHz and distributed to Whitecap IC
Pin H10
CLKIN, then from Whitecap
IC
Pin B7
to GCAP II
Pin F5
as GCAP_CLK. At the same time, 13 MHz varactor
Diode
CR248
is producing an output. This output is controlled in the following way:
The 26 MHz from
Y200
is divided down to 200 kHz and fed to a phase comparator
within the Magic IC. The 13 MHz from
CR248
is also divided down and fed to the
phase comparator, the difference in phase producing an error voltage that is fed
onto the cathode of varactor
CR248
to stabilize the 13 MHz clock. Once the software
is running and the logic side of the board has successfully powered-up, the
CLK_SELECT signal from Whitecap IC
Pin A1
is fed to Magic IC
Pin G6
. This in
turn switches the Multiplexer from the output of
Y200
to the output of
CR248
(see
Figure 9).
SIM Card Interface
The SIM interface is part of the Whitecap IC
U800
and supports both synchronous
(prepay card) and asynchronous serial data transmission. The SIM card is interro-
gated on power-up. VSIM1 (SIM_VCC) defaults to 3V but, if a 5V card is present
the SIM card is powered-down and VSIM1 reprogrammed to 5V. SIM inputs and
outputs are level-shifted within
GCAP II U900
to 3V. These signals are:
• Reset. Whitecap IC
Pin E9
RST0 to GCAP II
Pin K7
LS1_IN_TG1A. This sig-
nal is level-shifted to the required voltage and fed to SIM contacts
J803 Pin 2
from
Pin J7
LS1_OUT_TG1A.
• Clock. This is a 3.25MHz signal from Whitecap IC
Pin E9
CLK0
[
Pin E7
]
to
GCAP II
Pin G6
LS2_IN. This signal is level-shifted to the required voltage
and fed out to SIM Contacts
J803 Pin 1
from
Pin F6
LS2_OUT.
• SIM I/O. Data transmission to and from SIM card.
•
TX: From SIM card contact SIM I/O
J803
Pin 6
through to GCAP II
Pin
J8
SIM I/O. Level-shifted to desired voltage and out through
Pin K10
000721-O
Figure 9. 13 MHz Clock Block Diagram
13 MHz
Phase 1
Multiplexe
r
Y200
26MHz
F
F
2
CR248
Phase
Det
ector
F
F
65
Phase 2
PLL
Error Voltage
13MHz Output
to White
cap
200 kHz
F
F
130
MAGIC IC
U913
Содержание 38C V100
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