SI2457-D-FS datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Wireless rf/communication> Telecom circuit> SI2457-D-FS

SI2457-D-FS: DescriptionIC ISOMODEM SYSTEM-SIDE 16SOIC; CategoryWireless rf/communication Telecom circuit; File Size6MB，307 Pages; ManufacturerSilicon Laboratories Inc; Environmental Compliance

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IC ISOMODEM SYSTEM-SIDE 16SOIC

SI2457-D-FS Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Silicon Laboratories Inc
Parts packaging code	SOIC
package instruction	SOIC-16
Contacts	16
Reach Compliance Code	compliant
data rate	56 Mbps
JESD-30 code	R-PDSO-G16
length	9.9 mm
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Maximum seat height	1.75 mm
Nominal supply voltage	3.3 V
surface mount	YES
Telecom integrated circuit types	MODEM
Temperature level	COMMERCIAL
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.9 mm
Base Number Matches	1

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AN93

Si2493/57/34/15/04 (Revisions D and D1) and Si2494/39

(Revisions A and A1) Modem Designer ’s Guide

1. Introduction

The Si2494/93/57/39/34/15/04 ISOmodem chipset family consists of a 38-pin QFN (Si2494/39) or 24-pin TSSOP

(Si2493/57/34/15/04) or 16-pin SOIC (Si2493/57/34/15/04) low-voltage modem device, and a 16-pin SOIC line-

side DAA device (Si3018/10) connecting directly with the telephone local loop (Tip and Ring). This modem solution

is a complete hardware (controller-based) modem that connects to a host processor through a UART, parallel or

SPI interface. Parallel and EEPROM interfaces are available only on the 38-pin QFN or 24-pin TSSOP package

option. Refer to Table 4, “ISOmodem Capabilities,” on page 10 for available part number, capability and package

combinations. Isolation is provided by Silicon Laboratories’ isolation capacitor technology, which uses high-voltage

capacitors instead of a transformer. This isolation technology complies with global telecommunications standards

including FCC, ETSI ES 203 021, JATE, and all known country-specific requirements.

Additional features include programmable ac/dc termination and ring impedance, on-hook and off-hook intrusion

detection, Caller ID, loop voltage/loop current monitoring, overcurrent detection, ring detection, and the hook-

switch function. All required program and data memory is included in the modem device. When the modem

receives a software or hardware reset, all register settings revert to the default values stored in the on-chip

program memory. The host processor interacts with the modem controller through AT commands used to change

Silicon Laboratories representatives and distributors.

This application note is intended to supplement the Si2494/39 Revision A/A1, Si2493 Revision D/D1, and the

Si2457/34/15/04 Revision D/D1 data sheets. It provides all the hardware and software information necessary to

implement a variety of modem applications, including reference schematics, sample PCB layouts, AT command

and register reference, country configuration tables, programming examples and more. Particular topics of interest

can be easily located through the table of contents or the comprehensive index located at the back of this

document.

XTI

CLKOUT

EESD

EECLK

EECS

RXD

TXD

CTS

RTS

DCD

ESC

D0-D7

SDI

SDO

SCLK

INT

RESET

PLL

Clocking

EEPROM

Interface

XTO

Data Bus

Si3018/10

AOUT

AOUTb

FSYNC

SDO

SDI

MCLK

DSP

UART

Interface

Controller

DAA

Interface

To Phone

Line

Parallel

Interface

ROM

RAM

Program Bus

SPI

Interface

Si3000

Interface

Figure 1. Functional Block Diagram

Rev. 1.41 8/16

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AN93

ABLE

Section

ONTENTS

Page

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.1. Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2. Modem (System-Side) Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1. Resetting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.1.1. Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1.2. Reset Strapping: General Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1.3. Reset-Strap Options for 16-Pin SOIC Package . . . . . . . . . . . . . . . . . . . . . . 13

2.1.4. Reset-Strap Options for 24-Pin TSSOP Package. . . . . . . . . . . . . . . . . . . . . 13

2.1.4.1. Reset Strapping Options for TSSOP-24 with UART-Interface . . . . . . . 14

2.1.4.2. Reset Strapping Options for TSSOP-24 with Parallel-Interface . . . . . . 14

2.1.4.3. Reset Strapping Options for TSSOP with SPI-Interface. . . . . . . . . . . . 15

2.1.5. Reset Strapping Options for QFN Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.1.5.1. Reset Strapping Options for QFN Parts with UART Operation . . . . . . 15

2.1.5.2. Reset Strapping Options for QFN Parts with SPI Operation . . . . . . . . 16

2.1.5.3. Reset Strapping Options for QFN Parts with Parallel Operation . . . . . 16

2.2. System Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2.1. Interface Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2.2. Interface Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.2.3. UART Interface Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.2.3.1. UART Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.2.3.2. Autobaud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.2.3.3. Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.2.4. Parallel and SPI Interface Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.2.4.1. Hardware Interface Register 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.2.4.2. Hardware Interface Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.2.4.3. Parallel Interface Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.2.4.4. SPI Interface Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.2.4.5. Interface Communication Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.3. Isolation Capacitor Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.4. Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.4.1. Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.4.2. Wake-on-Ring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.4.3. Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.5. Controlling GPIOs (38-Pin QFN Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.6. SSI/Voice Mode (24-Pin TSSOP and 38-Pin QFN Only) . . . . . . . . . . . . . . . . . . . . . 33

2.7. EEPROM Interface (24-Pin TSSOP and 38-Pin QFN Only) . . . . . . . . . . . . . . . . . . . 34

2.7.1. Supported EEPROM Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

2.7.2. Three-Wire SPI Interface to EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2.7.3. Detailed EEPROM Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2.7.4. Boot Commands (Custom Defaults) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2.7.5. AT Command Macros (Customized AT Commands) . . . . . . . . . . . . . . . . . . 37

2.7.6. Firmware Upgrades. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

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AN93

2.7.6.1. Boot Command Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

2.7.6.2. AT Command Macro Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2.7.6.3. Autoloading Firmware Upgrade Example . . . . . . . . . . . . . . . . . . . . . . . 38

2.7.6.4. Combination Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3. DAA (Line-Side) Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

3.1. Hookswitch and DC Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.2. AC Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.3. Ringer Impedance and Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.4. Pulse Dialing and Spark Quenching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.5. Line Voltage and Loop Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.6. Legacy-Mode Line Voltage and Loop Current Measurement . . . . . . . . . . . . . . . . . . 45

3.7. Billing Tone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4. Hardware Design Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1. Component Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1.1. Power Supply and Bias Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1.2. Hookswitch and DC Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1.3. Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.1.4. Ringer Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4.1.5. Optional Billing-Tone Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4.2. Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

4.3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.4. Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

4.4.1. ISOmodem Layout Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4.4.2. Module Design and Application Considerations . . . . . . . . . . . . . . . . . . . . . . 57

4.4.2.1. Module Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.4.2.2. Motherboard Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.5. Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.5.1. Interaction between the AOUT Circuit and the

Required Modem Reset Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.5.2. Audio Quality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

4.5.3. Power Dissipation in the Si3018 DAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

5. Modem Reference Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.1. Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.2. DSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.3. Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.4. AT Command Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.5. Extended AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

5.6. S Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

5.7. U Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

5.7.1. U-Register Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

5.7.2. U00–U16 (Dial Tone Detect Filter Registers) . . . . . . . . . . . . . . . . . . . . . . . 104

5.7.3. U17–U30 (Busy Tone Detect Filter Registers) . . . . . . . . . . . . . . . . . . . . . . 105

5.7.4. U31–U33 (Ringback Cadence Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . 108

5.7.5. U34–U35 (Dial Tone Timing Register) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

5.7.6. U37–U45 (Pulse Dial Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

5.7.7. U46–U48 (DTMF Dial Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

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AN93

5.7.8. U49–U4C (Ring Detect Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

5.7.9. U4D (Modem Control Register 1—MOD1) . . . . . . . . . . . . . . . . . . . . . . . . . 110

5.7.10. U4E (Pre-Dial Delay Time Register) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

5.7.11. U4F (Flash Hook Time Register) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

5.7.12. U50–U51 (Loop Current Debouncing Registers) . . . . . . . . . . . . . . . . . . . 112

5.7.13. U52 (Transmit Level Register) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

5.7.14. U53 (Modem Control Register 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

5.7.15. U54 (Calibration Timing Register). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

5.7.16. U62–U66 (DAA Control Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

5.7.17. U67–U6A (International Configuration Registers). . . . . . . . . . . . . . . . . . . 115

5.7.18. U6C (Line-Voltage Status Register) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

5.7.19. U6E–U7D (Modem Control and Interface Registers) . . . . . . . . . . . . . . . . 119

5.7.20. U80 (Transmit Delay for V.22 Fast Connect) . . . . . . . . . . . . . . . . . . . . . . 129

5.7.21. U87 (Synchronous Access Mode Configuration Register) . . . . . . . . . . . . 130

5.7.22. UAA (V.29 Mode Register) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

5.8. Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

5.8.1. Method 1 (Fastest) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

5.8.2. Method 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

5.8.3. Method 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

5.9. Escape Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

5.9.1. +++ Escape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

5.9.2. “9th Bit” Escape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

5.9.3. “Escape Pin” Escape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

5.10. Data Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

5.11. Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

5.12. Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

5.13. EPOS (Electronic Point of Sale) Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

5.13.1. EPOS Fast Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

5.13.2. EPOS V.29 Fast Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

5.14. Legacy Synchronous DCE Mode/V.80 Synchronous Access Mode . . . . . . . . . . . 137

5.15. V.80 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

6. Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

6.1. Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

6.2. Country-Dependent Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

6.2.1. DC Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

6.2.2. Country Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

6.2.2.1. Country Initialization Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

6.2.2.2. Country-Setting Register Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

6.2.2.3. Special Requirements for Serbia and Montenegro. . . . . . . . . . . . . . . 158

6.2.3. Blacklisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

6.3. Caller ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

6.3.1. Force Caller ID Monitor (Always On) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

6.3.2. Caller ID After Ring Only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

6.3.3. UK Caller ID with Wetting Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

6.3.4. Japan Caller ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

6.3.5. DTMF Caller ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Rev. 1.41

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Shortcut: E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF EG EH EI EJ EK EL EM EN EO EP EQ ER ES ET EU EV EW EX EY EZ F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF FG FH FI FJ FK FL FM FN FO FP FQ FR FS FT FU FV FW FX FY FZ G0 G1 G2 G3 G4 G5 G6 G7 G8 G9 GA GB GC GD GE GF GG GH GI GJ GK GL GM GN GO GP GQ GR GS GT GU GV GW GX GZ H0 H1 H2 H3 H4 H5 H6 H7 H8 HA HB HC HD HE HF HG HH HI HJ HK HL HM HN HO HP HQ HR HS HT HU HV HW HX HY HZ I1 I2 I3 I4 I5 I6 I7 IA IB IC ID IE IF IG IH II IK IL IM IN IO IP IQ IR IS IT IU IV IW IX J0 J1 J2 J6 J7 JA JB JC JD JE JF JG JH JJ JK JL JM JN JP JQ JR JS JT JV JW JX JZ K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 KA KB KC KD KE KF KG KH KI KJ KK KL KM KN KO KP KQ KR KS KT KU KV KW KX KY KZ

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