T8532 datasheet(2/48 Pages) AGERE

2 / 48 page

Lucent Technologies Inc.

Preliminary Data Sheet

November 2000

Codec Chip Set

T8531/T8532 Multichannel Programmable

Table of Contents

Contents

Page

Features ..................................................................... 1

General Description.................................................... 1

T8532 Description.................................................... 4

T8531 Description.................................................... 5

Pin Information ........................................................... 7

Chip Set Functional Description ............................... 12

Transmit Path......................................................... 12

Antialias Filter and

Σ-∆ Converter ...................... 12

Decimator ........................................................... 12

Digital Transmit Gain Adjustment........................ 12

Band Filtering ...................................................... 12

µ-Law, A-Law, and Linear PCM Modes............... 12

Receive Path ......................................................... 13

Receive Path Filtering ......................................... 13

Digital Receive Gain............................................ 13

Interpolator and Digital Sigma-Delta

Modulator.......................................................... 13

Decoder, Filters, and Receive Amplifier ............. 13

Other Chip Set Functions....................................... 13

Voltage Reference............................................... 13

Hybrid Balance .................................................... 13

Analog Termination Impedance Synthesis.......... 13

Digital Termination Impedance Synthesis ........... 13

Loopback Modes ................................................. 14

Interchip Control Interface ................................... 14

T8531 Functional Blocks........................................ 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

DSP Engine Timing................................................ 16

T8531 Program Structure.................................... 16

Control of the DSP Engine via the

Microprocessor Interface .................................. 17

The DSP Engine Time-Slot Information

Tables ............................................................... 17

The DSP Engine ac Path Coefficient Table ........ 17

The Time-Slot Control Word................................ 18

Operations Performed by the DSP Engine at

T8531 Start-Up ................................................. 18

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

Time Slot........................................................... 20

DSP Engine Memory Requirements ................... 20

Contents

Page

T8531 Reset and Start-Up ..................................... 20

Hardware Reset .................................................. 20

Internal Reset ...................................................... 21

Reset of the T8532 Devices ................................ 21

Start-Up After Internal Reset.................................. 21

Autocalibration..................................................... 22

Tone Plant.............................................................. 22

DTMF Transceiver............................................... 22

Caller Line Identification ...................................... 22

Call Progress Tones............................................ 22

Absolute Maximum Ratings...................................... 23

Handling Precautions ............................................... 23

Electrical Characteristics .......................................... 24

dc Characteristics .................................................. 24

Transmission Characteristics ................................... 25

Timing Characteristics .............................................. 29

Software Interface .................................................... 32

Applications .............................................................. 42

Common Voltage Reference.................................. 45

Outline Diagrams...................................................... 46

64-Pin MQFP ......................................................... 46

64-Pin TQFP .......................................................... 47

Ordering Information................................................. 48

Appendix A. Transmit Path Group Delay vs. Bit

Offset ................................................................ 48

Figures

Page

Figure 1. System Block Diagram .................................1

Figure 2. Block Diagram of T8532 Octal Converter.....4

Figure 3. Block Diagram of One T8532 Analog

Channel........................................................4

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

Assuming 2.048 MHz SCK Rate ................30

Figure 10. Timing Diagram for Microprocessor

Write/Read to/from the DSP on the

Control Interface.......................................31

Figure 11. Line Card Solution Using the L7585

SLIC .........................................................42

Figure 12. Line Card Solution Using the L9215G

SLIC .........................................................43

Figure 13. Line Card Solution Using the L9310G

SLIC .........................................................44

Figure 14. Common 2.4 V Voltage Reference...........45

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