Nokia 7600 Service Manual 07 nmm3 system

Customer Care Solutions

NMM-3 Series Transceivers

7 - System Module & UI

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Table of Contents

Page No

Introduction ............................................................................................................................................. 5

System Module Baseband .................................................................................................................... 5

Power Distribution Diagram ..............................................................................................................7

Environmental operating conditions ...............................................................................................8

Temperature Conditions................................................................................................................... 8

Humidity and Water Resistance.................................................................................................... 8

Baseband Functional Description ...................................................................................................... 8

Modes of Operation ............................................................................................................................. 8

Battery .....................................................................................................................................................9

Backup Battery ....................................................................................................................................10

Power Up and Reset ...........................................................................................................................10

UEME Reset Sequence and Timings ..............................................................................................11

A/D Channels .......................................................................................................................................11

ZOCUS ....................................................................................................................................................12

Bluetooth ..............................................................................................................................................13

Camera ..................................................................................................................................................15

UI Module .............................................................................................................................................16

Display ................................................................................................................................................. 16

Backlighting .................................................................................................................................... 16

IR Module .............................................................................................................................................18

SIM Interface .......................................................................................................................................19

External Accessory Interface ...........................................................................................................20

Pop-Port System Connector ........................................................................................................ 20

Charger interface............................................................................................................................ 21

ACI ..................................................................................................................................................... 21

USB interface................................................................................................................................... 21

External Audio ................................................................................................................................... 22

External Microphone Connection ............................................................................................. 22

External Earphone Connections ................................................................................................ 23

Internal Audio .................................................................................................................................... 23

IHF Speaker ..................................................................................................................................... 23

Internal Microphone ..................................................................................................................... 24

Internal Speaker.............................................................................................................................. 24

Memory Block ......................................................................................................................................25

PDRAM ...................................................................................................................................................25

External Flash Memory ................................................................................................................ 25

External SDRAM ............................................................................................................................. 25

NMM-3 Test interfaces ................................................................................................................... 26

Baseband General Specification ..................................................................................................... 26

Absolute Maximum Ratings .......................................................................................................... 26

DC Characteristics ............................................................................................................................ 26

RF Module Description ....................................................................................................................... 27

Introduction ....................................................................................................................................... 27

DC Characteristics ............................................................................................................................ 27

Regulators ........................................................................................................................................ 27

RF-BB Interface .............................................................................................................................. 29

RF block diagram .............................................................................................................................. 30

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CCS Technical Documentation 7 - System Module & UI

General ............................................................................................................................................. 30

Description of the RF Related Converters .............................................................................. 31

GSM RF ..................................................................................................................................................33

GSM RF Characteristics ............................................................................................................... 33

GSM functional descriptions ......................................................................................................... 34

RF block diagram ........................................................................................................................... 34

GSM frequency synthesizer ........................................................................................................ 35

GSM transmitter ............................................................................................................................ 35

Power control ................................................................................................................................. 36

GSM receiver ................................................................................................................................... 37

AGC strategy ................................................................................................................................... 38

AFC function ................................................................................................................................... 39

WCDMA RF ...........................................................................................................................................40

WCDMA RF Characteristics ........................................................................................................ 40

WCDMA Functional Description ................................................................................................... 41

WCDMA synthesizers ................................................................................................................... 41

WCDMA transmitter ..................................................................................................................... 42

TX power control ............................................................................................................................ 43

WCDMA receiver ............................................................................................................................ 44

AGC strategy ................................................................................................................................... 45

Tables

1. Voltage supplies and references ........................................................................................... 27

2. Binary signals ............................................................................................................................. 29

3. Analog signals ............................................................................................................................ 29

4. GSM900 / GSM1800 System Characteristics .................................................................... 33

5. Transmitter Characteristics .................................................................................................... 33

6. Receiver Characteristics .......................................................................................................... 33

7. WCDMA System Characteristics ........................................................................................... 40

8. TX Main Characteristics ........................................................................................................... 40

9. RX Main Characteristics .......................................................................................................... 40

Figures

1. Voltage supplies for RF ............................................................................................................ 28

2. RF related converters ............................................................................................................... 32

3. GSM RF Block Diagram ............................................................................................................ 34

4. Phase locked loop, PLL ............................................................................................................. 35

5. GSM Power Control Loop ........................................................................................................ 37

6. RX Gain Control in GSM .......................................................................................................... 39

7. WCDMA TX Block Diagram ..................................................................................................... 42

8. WCDMA RX Block Diagram .................................................................................................... 44

9. RX Gain Control in WCDMA ................................................................................................... 45

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CCS Technical Documentation 7 - System Module & UI

Introduction

The NMM-3 System module (or Engine) consists of Baseband and RF sub-modules, a
summary of the function and operation of the Baseband sub-modules are described here.

System Module: Baseband

Main functionality of the baseband is implemented into two ASICs: TIKU and UEME.

Baseband block diagram:

User data FLASH

256Mbit NAND

FLASH

Program

128Mbit NOR

SDRAM

64Mbit

Core

supply

IR

Camera

supply

Display

Camera

LED

drivers

Core

supply

TIKU

ARM925

PDRAM

CDSP
lead 3

ADSP
lead 3

Keypad

MCU

COWIS

Supply

3G

Logic

2G

Logic

COWIS

NUT

BLUETOOTH

RF Block

UEME

Regulation

Charge control

Audio

FBUS/MBUS

SIM I/F

RTC

Zocus

speaker

Earpiece

MIC

Vibra

Production test

interface

IHF

USIM

Pop-port system

connector

DC

jack

Battery

UEME is the Universal Energy Management Enhanced IC for digital hand portable
phones. In addition to energy management, functionality UEME performs all the base­band mixed–signal functions.

TIKU is the main digital baseband ASIC.

UEME is essentially the same as UEM, but with the following additions:

• An internal IHF amplifier saving the need for an external amplifier and the many
associated passives.

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• An extra regulator for Tomahawk so saving small area and cost needed for an
external regulator.

• Stereo audio support for stereo tomahawk accessories, which is necessary for the
Music Player.

• Wider audio bandwidth that can be used to improve audio quality of MP3/AAC
and ring tones.

Baseband power is supplied from a 2.8V analogue voltage and 1.8V I/O voltage. UEME
includes 8 linear LDO (Low Drop-Out) regulators for Baseband and 7 regulators for RF. It
also contains 4 current sources for biasing purposes, two for internal use. UEME also
includes a SIM interface, which supports 1.8V and 3V SIM cards. Note: 5V SIM cards are
no longer supported by DCT-4 generation Baseband.

A real time clock function is integrated into UEME, which utilizes the same 32KHz clock
supply as the sleep clock. A backup power supply is provided for the RTC-battery, which

keeps the real time clock running when the main battery is removed. A 10µAh capacitor

provides RTC backup for 3 hours minimum.

The TIKU Brain consists of 5 sections: - the ARM925 Mega-Module, (consisting of the
ARM9 MCU, Cache memory, Parallel LCD Controller, and Traffic Controller), C-DSP Lead 3
Mega-Module, D-DSP Lead 3 Mega-Module, PDRAM, and PDA Peripherals.

The ARM-Mega-Module has a Traffic controller, which provides the interface between
the MCU, external memories, LCD controller, and internal busses. It also processes the
data packages for burst mode memory access.

The PDA Peripherals consists of Camera Compact Port (CCP) interface, IR, USB, and Dis­play interfaces.

The DPLL frequencies are currently:

• MCU: 124.8MHz

• DSPs: 148.0MHz

• PDA: 48MHz

NMM-3 will use TIKU version 1.23

NMM-3 uses a discrete LM2608-1.3 SMPS 1.5V/1.3V regulator for TIKU core supply.

The UEME ASIC handles part of the interface between the baseband and the RF section.
The GSM RX path goes via ADCs in UEME intended for the purpose, but the GSM TX path
uses the dual purpose DACs on board the Tiku baseband ASIC. Tiku DACs are used for
both GSM and WCDMA TX paths. The WCDMA RX path is via Tiku ADCs. UEME also pro­vides the RF section with a DAC for AFC control, a simple "Is RF present?" level detector
TXPWRDET, a DAC for TXC WCDMA power control, two reference voltages VREF01 and
VREF02, and a 4-bit controlled current output IPA1 used for WCDMA PA bias control.
IPA2 is not used. UEME is controlled by Tiku using two serial buses CBUS and DBUS.
CBUS mostly carries commands from the MCU and DBUS mostly carries commands from
the DSP. UEME also contains the analogue parts of the audio codecs which are capable

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d

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CCS Technical Documentation 7 - System Module & UI

of working in various modes from ordinary telephone voice quality to near CD quality. An
8ohm output loudspeaker driver is available for integrated handsfree use. UEME has twin
stereo codecs for stereo headsets. The audio signals are passed from Tiku in the form of
LEFT and RIGHT PDM signals plus and audio clock. The clock and PDM speed changes
according to the quality mode. UEME digital i/o voltages are 1.8V though some of the
internal logic is 2.78V. 2.78V is used for the analogue parts and VBAT is also used for
some of the driver circuits like the vibra, IHF PA, and LED driver.

The Baseband supports both internal and external microphone inputs and speaker out­puts. Input and output source selection and gain control is performed by UEME accord­ing to control messages from TIKU. Keypad tones, DTMF, and other AUDIO tones are
generated and encoded by TIKU and transmitted to UEME for decoding. An external vibra
alert control signal is generated by UEME with separate PWM outputs.

NMM-3 has two external serial control interfaces: FBUS and USB. FBUS can be accessed
via the test pads, and USB via the system connector.

Power Distribution Diagram

The NMM-3 power distribution block diagram is shown below

VIO

Vlogic

IR

Camera

Connector

RF PAs

VFLASH1

Vcc

4R7

UEME VCORE

1.8V

2.8V

LP3985-2.8

2.8 V

VFLASH1

VBAT

20mR

Prot cct

VIO

3.3mR

Battery

contacts

BL-5C

0.22R

ZOCUS

Sense-

Sense+

Vcc

20mR

VREG

VCC
VCC
VCC

VAPP

GND

Vanode

Bluetooth

MANGO GSM/WCDM A RF

BLOCK

VR5

VR4

VR3

VR2

VR1B

VR1A

4.75

4.75

VBATVR1

VBATVR2

VBATVR3

VBATVR4
VBATVR5

VBATVR6
VBATVR7

VBATBB2

VBATBB4

VBATBB5

VBATBB3

VBATBB1

Vibra driver

VBATREGS

V refs Charcon

Charger

Switch

UEME Vchar

protection

Charger

GND

2.8

Jack

2.8

2.8

UEME

VRTC VBU

Back Up

2.8

battery

VR6

2.8

Vin

TK1185

VR7

Audio PA

Vana

Camera
digital supply

UI MODULE

LP2985-1.8

VIO

NUT

(USB IF)

Vcc

33R

VBUS VOUT

Colour LCD

Vcc

Vi/o

Vbat

Vbat

LP3987

2.85V

COWIS

TX/RX

converters

TIK

Clock slicer

I/O

Memory
interface

i/o

VddDi

Core

DPLLs

Periferals

2GBody

ARM9

LEAD3

LEAD3

Voodoo

128Mb NOR Flash

Vcc
Vccq

256Mb NAND

Vcc

Flash

Vccq

64Mb SDRAM

Vccq
Vcc

1.8V

RX

TX

Vbat

LM2608-1.3

DC-DC buck

Vref

1.5V, active

1.3V deep sleep

VTiku

Vpp

12V VPP

gen i/o

+VLCDLED

vfb

VREF01

2.8

-VLCDLED

+VKEYLED

-VKEYLED

KEY LED
Current sink

VREF02

1.35

1.35

GSM RF

converters

VSIM

3.0/1.8V

VFLASH1

2.78V

VIO

1.8V

Vcore

1.8V

VAUX2

2.78V

VANA

2.78V

VAUX1

2.78V

VAUX3

2.78V

IHF

bias

Vdd28

Vdd18

RxAVd

TxAVd

/C

/C

/C

VCHAR

TOMAHAWK (“POP PORT”)

Vcc

SIM

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Environmental operating conditions

Temperature Conditions:

NMM-3 should operate with full functionality within an ambient temperature range of -

10°C to +60°C, and with reduced functionality between -25°C to -10°C and +55°C to
+75°C.

Humidity and Water Resistance:

Full functionality within humidity range of 5% to 95%.

Condensed or dripping water may cause intermittent malfunctions. Protection against
dripping water has been implemented.

Baseband Functional Description

Modes of Operation

TB4 baseband engine has six different operating modes:

• No supply

• Backup

•Acting Dead

•Active

• Sleep

• Charging

No supply

In NO_SUPPLY mode the phone has no supply voltage. This mode is due to disconnection
of main battery and backup battery or low battery voltage level in both of the batteries.

The phone exits from NO_SUPPLY mode when sufficient battery voltage level is detected.
Battery voltage can rise either by connecting a new battery with VBAT > V

by connecting charger and charging the battery above V

Backup

In BACKUP mode the backup battery has sufficient charge but the main battery can be
disconnected or empty (VBAT < V

and VBACK > 2.0V).

MSTR

MSTR+

.

MSTR+

(2.1V) or

Real Time Clock (VRTC) regulator is disabled in BACKUP mode. VRTC output is supplied
without regulation from backup battery (VBACK). All the other regulators are disabled.

Acting Dead

If the phone is off when the charger is connected, the phone is powered on but enters a
state called ”Acting Dead”. To the user the phone acts as if it was switched off. A battery
charging alert is given and/or a battery charging indication on the display is shown to
acknowledge the user that the battery is being charged.

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Active

In the active mode the phone is in normal operation, scanning for channels, listening to
a base station, transmitting and processing information. There are several sub–states in
the active mode depending on if the phone is in burst reception, burst transmission, if
DSP is working etc.

One of the sub–state of the active mode is Bluetooth on state, enabled by UEME. Blu­tooth circuitry is controlled by the MCU and 26MHz reference clock is generated by the

Module TCXO.

In active mode the RF regulators are controlled by SW writing into UEMEs register set­tings: VR1A can be enabled or disabled. VR2 can be enabled or disabled and VR4 –VR7
can be enabled or disabled or forced into low quiescent current mode. VR3 is always
enabled in active mode.

Sleep mode

Sleep mode is entered when the MCU and both DSPs are in stand–by mode. Sleep is con­trolled by the processor. When SLEEPX low signal is detected UEME enters SLEEP mode.
VCORE, VIO and VFLASH1 regulators are put into low quiescent current mode. All RF reg­ulators are disabled in SLEEP. When SLEEPX=1 goes high, UEME enters ACTIVE mode and
all functions are activated.

Battery

The sleep mode is exited either by the expiration of a sleep clock counter in the UEME or
by some external interrupt, generated by a charger connection, key press, headset con­nection etc.

In sleep mode the 19.2MHz ref clock (VCTCXO) is shut down and 32 kHz sleep clock
oscillator is used as reference clock for the baseband.

Charging

The battery voltage, temperature, size and current are measured by UEME controlled by
the charging software running in TIKU.

The charging control circuitry (CHACON) inside the UEME controls the charging current
delivered from the charger to the battery. The battery voltage rise is limited by turning
the UEME switch off when the battery voltage has reached 4.2 V. Charging current is
monitored by measuring the voltage drop across a 220 mOhm resistor R200.

850 mAh Li-ion battery pack BL-5C is used in NMM-3.
Nominal discharge cut–off voltage 3.35V
Nominal battery voltage 3.7V
Nominal charging voltage 4.2V

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Signal Name Pin Number Function

VBAT 1 Positive battery terminal

BSI 2 Battery capacity measurement (fixed resistor inside the battery pack)

GND 3 Negative/common battery terminal

Battery temperature measurement

In Lynx batteries there are neither BTEMP pin nor NTC resistor. Battery’s temperature is
estimated by the measurement of a discrete NTC resistor in the phone located close to
the battery.

Backup Battery

To preserve the Real Time Clock (RTC), when the main battery is removed, a RTC back-up
capacitor B253 is installed in the phone. This 10uAh solution will give about 3hrs back­up time in worst case.

The backup battery (capacitor) is connected between UEME VBACK and GND. In UEME
backup battery charging high limit is set to 3.2V. The cut–off limit voltage (VBUCoff–) for
backup battery is 2.0V. Backup battery

Charging is controlled by MCU by writing to UEME registers.

Power Up and Reset

Power up and reset is controlled by the UEME ASIC. NMM-3 baseband can be powered
up in following ways:

• Press power button which means grounding the PWRONX pin of the UEME

• Connect the charger to the charger input

• Supply battery voltage to the battery pin

• RTC Alarm, the RTC has been programmed to give an alarm

After receiving one of the above signals, the UEME counts a 20ms delay and then enters
it’s reset mode. The watchdog starts up, and if the battery voltage is greater than V

(2.1V) a 200ms delay is started to allow references etc. to settle. After this delay elapses
the VFLASH1 regulator is enabled. 500us later VR3, VANA, VIO and VCORE are enabled.
Finally the PURX (Power Up Reset) line is held low for 20 ms. this reset, PURX, is fed to
the baseband ASIC TIKU, resets are generated for the MCU and DSPs. During this reset
phase the UEME forces the VCTCXO regulator on regardless of the status of the sleep
control input signal to the UEME.

coff+

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CCS Technical Documentation 7 - System Module & UI

All baseband regulators are switched on at the UEME power on except SIM and VAUX1,
2, 3 regulators that are controlled by the MCU (VFLASH2 is not used on NMM-3). The
UEME internal watchdogs are running during the UEME reset state, with the longest
watchdog time selected. If the watchdog expires the UEME returns to power off state.
The UEME watchdogs are internally acknowledged at the rising edge of the PURX signal
in order to always give the same watchdog response time to the MCU.

UEME Reset Sequence and Timings

The diagram below shows the timing of the reset sequence on the NMM-3.

POWERONX

EMRSTX

VRAM (SDRAM core)

VTIKU (Tiku core)

VFLASH1

VIO, VR3, VANA,
SMPSCLK

Delay1
20ms

Delay2
200ms

1.3V

Delay3

0.5ms

Delay4
20ms

1.5V

RFCLK

(19.2MHz)

PURX, SLEEPX

A/D Channels

The UEME contains the following A/D converter channels that are used for several mea­surement purpose. The general slow A/D converter is a 10-bit converter using the UEME
interface clock for the conversion. An interrupt will be given at the end of the measure­ment.

The UEME’s 13–channel analog to digital converter is used to monitor charging func­tions, battery functions, voltage levels in external accessory detection inputs, user inter­face and RF functions.

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The monitored battery functions are:

• Battery voltage (VBATADC),

• Battery type (BSI)

• Battery temperature (BTEMP).

The battery type is recognized through a resistive voltage divider. In phone there is a
100kOhm pull up resistor to VFLASH1 in the BSI line and the battery has a pull down
resistor in the same line. Depending on the battery type the pull down resistor value is
changed. The battery temperature is measured equivalently except that the NTC pull
down resistor used for temperature sensing is on the phone.

The monitored charger functions are:

• Charger Voltage (VCHAR)

• Charger current (ICHAR)

The voltage measured across a 0R22 resistor (R200) in circuit with charger voltage out
from UEME is used to determine ICHAR.

ZOCUS

The HEADINT and HOOKINT are external accessory detection inputs used for monitoring
voltage levels in these inputs. They are routed internally from the miscellaneous.

The monitored RF functions are:

• Power amplifier temperature (GRFTEMP)

• VCXO Temperature (WTx_TEMP)

PATEMP input is used to measure temperature of the TEX and HLGA.

A/D values can be monitored through the ‘ADC Reading’ window in Phoenix.

The ZOCUS device N201 (National LM3819) is a calibrated current sensor, used by energy
management software to determine the current consumption in the mobile phone.

Current is sensed across a “zero-ohm” PWB track resistor (actual trace resistance is

~3.3mΩ) using a high gain and extremely low offset comparator. The measured current

is converted to a pulse width modulation (PWM) signal with the duty cycle representing
both the magnitude and direction of current. The PWM signal is converted to digital data
that can be read by the phone via the CBUS interface.

ZOCUS reads the average current over a period of approximately 1 second.

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To determine the functionality of ZOCUS, use Phoenix ADC Reading option to read the
phones Battery average current, the value returned is calculated from values measured
by ZOCUS. Also self-test will prove CBUS connectivity to ZOCUS.

Bluetooth

VBAT

BSI

GND

Current Sense

track resistor

VBAT

UEME

Sense In

ZOCUS

N201

VDD GND

CBUS

D200

The Bluetooth circuit consists of the Bluetooth module (N101), A TCXO (G100) operating
at 26MHz.

The BT202 Bluetooth transceiver module for NMM-3, consists of a RF ASIC, Baseband
ASIC and 4Mbits Flash Memory. It contains UART and PCM user interface. The supply
voltage is VBAT, VFLASH1 and VIO. External reference clock is 26 MHz.

The Bluetooth module is not a repairable part, and so should be replaced if found to be
defective..

56:XTALGND

55:XTAL

54:VCC

53:VCC

52:VCC

51:GND

50:SYSCLK

49:VBB EN

1:GND

2:GND

3:GND

4:GND

5:GND

6:VRE G

7:GND

8:GND

9:GND

10:GND

48:SLEEP X

xxxxxxx

xxxxxxxxxxxxx

47:GND

46:VCC XTAL

45:VDD

44:RESETX

43:GPP2

42:WRX

41:GPP3.

40:GPP4

39:GND

38:GPP0

37:GPP1

36:GPP10

35:GPP11

34:CENX

33:GND

32:VAPPL

31:OSCON

30:GPP9

29:GND

11:G ND

12:ANT

13:GND

14:GND

15:GND

16:REFCLK

17:GND

18:EN26MH Z

19:GND

20:TRST

21:TMS

22:TDO

23:TDI

24:GPP5

25:TCK

26:SPLCLK

27:GPP7

28:GPP6

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Pin Description:

No.

44 RESETX PURX BB reset input from UEME

50 SYSCLK1 SYSCLK system clock_input / 26MHz from TCXO G100

55 XTAL - internal 13MHz oscillator / Not connected

56 XTALGND GND Select oscillator / Ground

18 EN26MHZ VIO Defines system clock / connected to VIO for 26MHz

16 REFCLK GND Reference clock input / connected to Ground

26 SLPCLK SLEEPCLK Sleep clock input from UEME

49 VBBEN UEMRSTX Internal RF regulators enabled by UEME ResetX

48 SLEEPX SLEEPX Switch to active mode

31 OSCON OSCON Force active mode(=ResetX for Flash)

1-5, 7-11, 13-

15, 17,19,

29,33,

39,47,51

52-54 VCC VBAT_BT Main power supply voltage input from Battery

6 VREG VFLASH1 Regulated power supply voltage input 2.78V from

46 VCCXTAL VCCXTAL Regulated 2.4V supply output for external TCXO G100

Bluetooth
Name

GND GND Ground reference

NMM-3 Name Function / Destination

VFLASH1, used for RF and BB parts.

45 VDD GPP3 Regulated 1.8V supply for internal BB and Memory

Blocks

32 VAPPL VIO 1.8V supply for application interfacing

12 ANT ANT Antenna pin

38 GPP0 LPRFSYNC General purpose port / Data Bus

37 GPP1 LPRFINT Interrupt to TIKU to initilise BT operation.

43 GPP2 GND General purpose port connected to Ground

41 GPP3 VDD General purpose port supply for internal BB and Mem-

ory Blocks

40 GPP4 - General purpose port / No Connection

24 GPP5 GND General purpose port connected to Ground

28 GPP6 LPRFRX General purpose port / Data Bus

27 GPP7 LPRFTX General purpose port / Data Bus

30 GPP9 - General purpose port / No Connection

36 GPP10 CBUSCLK General purpose port used for control and flash pro-

gramming

35 GPP11 CBUSDA General purpose port used for control and flash pro-

gramming

34 CENX CBUSENX CBUS enable / No Connection

20 TRST - JTAG test reset / No Connection

21 TMS - JTAG test mode / No Connection

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