AN77: Silicon DAA Software Guidelines

AN77
S I L I C O N DAA S OFTWARE G UIDELINES
1. Introduction
This document provides the steps necessary to program the Si3050 DAA for basic operation using either the PCM/
SPI or GCI control interface.
DSP or ASIC
3.3 V
Si3050
VD
CS
SCLK
CS
SCLK
SDI
SDO
SDO
SDI
PCLK
FSYNC
VA
PCLK
FSYNC
RX
DTX
TX
DRX
GPO
RST
GND
Figure 1. Si3050 in PCM/SPI Mode Block Diagram
Rev. 0.1 9/06
Copyright © 2006 by Silicon Laboratories
AN77
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Power Up
RST Low Pulse
Write Register 33
// Enable PCM mode
20h = ALaw
28h = Law
30h = 8-bit Linear
38h = 16-bit Linear
Write Register 26
// Set DC Termination
Write Register 30
// Set AC Termination
Set Advanced
Configuration*
Write Register 6 (00h)
// Enables ISOcap™
Write Register 5 (01h)
// Takes Si3050 off-hook
*Advanced configuration includes programmable interupts, ring detection thresholds,
ring qualification, TX/RX gain settings, etc.
Figure 2. Si3050 Basic Off-Hook Routine with Configuration 1
2
Rev. 0.1
AN77
DSP or ASIC
3.3 V
Si3050
VD
FSYNC
FSYNC
PCLK
PCLK
RX
DTX
TX
DRX
GPO
RST
VA
SCLK
GND
Figure 3. Si3050 in GCI Mode Block Diagram
Rev. 0.1
3
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Power Up
RST Low Pulse
Write Register 42
// Enable GCI mode
01h = ALaw (B1)
05h = Law (B1)
09h = 8-bit Lin (B1)
0Fh = 16-bit Linear
Write Register 26
Write Register 30
02h = ALaw (B2)
06h = Law (B2)
0Ah = 8-bit Lin(B2)
// Set DC Termination
// Set AC Termination
Set Advanced
Configuration*
Write Register 6 (00h) // Enables ISOcap™
Write Register 5 (01h) // Takes Si3050 off-hook
*Advanced configuration includes programmable interupts, ring detection thresholds,
ring qualification, TX/RX gain settings, etc.
Figure 4. Si3050 Basic Off-Hook Routine with Configuration 2
4
Rev. 0.1
AN77
NOTES:
Rev. 0.1
5
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Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers
using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
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