T8531-TL-DB Agere Systems, Inc., T8531-TL-DB Datasheet - Page 2

• Manufacturer Part Number: T8531-TL-DB
• Description: Multichannel programmable codec chip set. Dry pack tray.
• Manufacturer: Agere Systems, Inc.

Codec Chip Set
Contents
Features ..................................................................... 1
General Description.................................................... 1
Pin Information ........................................................... 7
Chip Set Functional Description ............................... 12
2
T8532 Description.................................................... 4
T8531 Description.................................................... 5
Transmit Path......................................................... 12
Receive Path ......................................................... 13
Other Chip Set Functions....................................... 13
T8531 Functional Blocks........................................ 14
DSP Engine Timing................................................ 16
Antialias Filter and - Converter ...................... 12
Decimator ........................................................... 12
Digital Transmit Gain Adjustment........................ 12
Band Filtering ...................................................... 12
Receive Path Filtering ......................................... 13
Digital Receive Gain............................................ 13
Interpolator and Digital Sigma-Delta
Decoder, Filters, and Receive Amplifier ............. 13
Voltage Reference............................................... 13
Hybrid Balance .................................................... 13
Analog Termination Impedance Synthesis.......... 13
Digital Termination Impedance Synthesis ........... 13
Loopback Modes ................................................. 14
Interchip Control Interface ................................... 14
Clock Synthesizer................................................ 14
DSP Clock Frequency Selection ......................... 14
T8531 System Interface ..................................... 15
T8531 Microprocessor Interface.......................... 15
T8532 Octal Control Interface ............................. 16
T8531 Time-Slot Assignment (TSA).................... 16
T8531 Program Structure.................................... 16
Control of the DSP Engine via the
The DSP Engine Time-Slot Information
The DSP Engine ac Path Coefficient Table ........ 17
The Time-Slot Control Word................................ 18
Operations Performed by the DSP Engine at
Microprocessor Start-Up of the DSP Engine....... 19
Powering Up a Time Slot in the T8531................ 19
Disabling a Time Slot in the T8531 ..................... 19
T8532 Powerup/Powerdown ............................... 19
Changing DSP RAM Space of an Active
DSP Engine Memory Requirements ................... 20
-Law, A-Law, and Linear PCM Modes............... 12
Modulator.......................................................... 13
Microprocessor Interface .................................. 17
Tables ............................................................... 17
T8531 Start-Up ................................................. 18
Time Slot........................................................... 20
Table of Contents
Page
Contents
Absolute Maximum Ratings...................................... 23
Handling Precautions ............................................... 23
Electrical Characteristics .......................................... 24
Transmission Characteristics ................................... 25
Timing Characteristics .............................................. 29
Software Interface .................................................... 32
Applications .............................................................. 42
Outline Diagrams...................................................... 46
Ordering Information................................................. 48
Appendix A. Transmit Path Group Delay vs. Bit
Figures
Figure 1. System Block Diagram .................................1
Figure 2. Block Diagram of T8532 Octal Converter.....4
Figure 3. Block Diagram of One T8532 Analog
Figure 4. T8531 Block Diagram...................................5
Figure 5. T8531 Digital ac Path ...................................6
Figure 6. Control, PCM, and Octal Interfaces..............6
Figure 7. T8532 64-Pin MQFP ....................................7
Figure 8. T8531 64-Pin TQFP .....................................9
Figure 9. Timing Characteristics of PCM Interface
Figure 10. Timing Diagram for Microprocessor
Figure 11. Line Card Solution Using the L7585
Figure 12. Line Card Solution Using the L9215G
Figure 13. Line Card Solution Using the L9310G
Figure 14. Common 2.4 V Voltage Reference...........45
T8531 Reset and Start-Up ..................................... 20
Start-Up After Internal Reset.................................. 21
Tone Plant.............................................................. 22
dc Characteristics .................................................. 24
Common Voltage Reference.................................. 45
64-Pin MQFP ......................................................... 46
64-Pin TQFP .......................................................... 47
Hardware Reset .................................................. 20
Internal Reset ...................................................... 21
Reset of the T8532 Devices ................................ 21
Autocalibration..................................................... 22
DTMF Transceiver............................................... 22
Caller Line Identification ...................................... 22
Call Progress Tones............................................ 22
Offset ................................................................ 48
Channel........................................................4
Assuming 2.048 MHz SCK Rate ................30
Write/Read to/from the DSP on the
Control Interface.......................................31
SLIC .........................................................42
SLIC .........................................................43
SLIC .........................................................44
Lucent Technologies Inc.
November 2000
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