Data access arrangement utilizing a serialized digital data path across an isolation barrier

• US 6,647,101 B2
• Filed: 10/26/2001
• Issued: 11/11/2003
• Est. Priority Date: 11/16/1998
• Status: Expired due to Fees

• Current Assignee: Silicon Laboratories Incorporated
• Original Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Inventors: Beutler, Thomas Grey, Rahamim, Raphael, Riggert, Eric Floyd
• Primary Examiner(s): Ramakrishnaiah, Melur
• Application Number:
  US10/032,776
• Publication Number:
  US 20020126806A1
• Time in Patent Office: 746 Days
• Field of Search: 379/93.05, 379/93.28, 379/90.01, 379/93.31, 379/93.29, 379/442-443, 379/399.01, 379/399.02, 375/222, 375/241-242, 375/340
• US Class Current: 379/93.05
• CPC Class Codes: H04M 11/066 Telephone sets adapted for data transmision

Abstract

A modem utilizing a DAA having line side circuitry including a telephone network interface and system side circuitry including a host system interface. The line side circuitry and the system side circuitry are separated by a high voltage isolation barrier. In accordance with the invention, the high voltage isolation barrier and other DAA circuitry are configured such that data and control information may be communicated between the system side circuitry and the line side circuitry using a serialized digital communication protocol. In one embodiment of the invention, the line side circuitry of the modem includes detection and measurement circuitry that is programmable to measure or establish electrical characteristics (e.g., tip/ring voltage and loop current) of the telephone line interface connection. Command information for the programmable circuitry is multiplexed with data communicated across the high voltage isolation barrier. Interrupt signals and information for synchronizing communications between the system side circuitry and the line side circuitry may also comprise a portion of the serialized datastream.

Claims

1. A data access arrangement, comprising:

a high voltage isolation barrier having a first side and a second side, and a first capacitor and a second capacitor;

system side circuitry coupled to the first side of the high voltage isolation barrier, the system side circuitry configurable to communicate with host system circuitry and comprises a first transceiver circuit for bidirectional communications with the high voltage isolation barrier; and

line side circuitry coupled to the second side of the high voltage isolation barrier, the line side configurable to communicate with a telephone network and comprises a second transceiver circuit for bidirectional communications with the high voltage isolation barrier, the first and second transceiver circuits configured to transmit/receive differential signals across the first and second capacitors to communicate the serialized digital information,

wherein data and control information are communicated between the system side circuitry and the line side circuitry across the high voltage isolation barrier in a serialized digital format, wherein the high voltage isolation barrier further comprises circuitry configurable to provide a clock signal from the system side circuitry to the line side circuitry, and wherein the serialized digital information is communicated at approximately one half of the frequency of the clock signal.

2. The data access arrangement of claim 1, wherein the data and control information is multiplexed as part of the same serialized digital datastream.

3. The data access arrangement of claim 2, wherein the serialized digital datastream communicated between the system side circuitry and the line side circuitry is organized in frames having at least data portion and a control portion.

4. The data access arrangement of claim 1, wherein the serialized digital information contains error correction information relating to the data information.

5. The data access arrangement of claim 4, wherein the error correction information comprises redundant data information.

6. The data access arrangement of claim 1, wherein the serialized digital information contains synchronization bits for synchronizing serial communications between the system side circuitry and the line side circuitry.

7. The data access arrangement of claim 1, wherein the line side circuitry further comprises a coder/decoder, and wherein the serialized digital data information communicated between the system side circuitry and the line side circuitry includes encoded information generated by the coder/decoder and information for decoding by the coder/decoder.

8. The data access arrangement of claim 7, wherein the line side further circuitry comprises:

a programmable circuit,

wherein the system side circuitry multiplexes control information for the programmable circuit and the information for decoding by the coder/decoder and communicates the multiplexed information as part of the serialize digital information.

9. The data access arrangement of claim 8, wherein the programmable circuit is a line/ring impedance circuit.

10. The data access arrangement of claim 8, wherein the programmable circuit is a ring detection circuit.

11. The data access arrangement of claim 8, wherein the programmable circuit is a loop current measurement circuit.

12. The data access arrangement of claim 8, wherein the programmable circuit is a caller ID circuit.

13. The data access arrangement of claim 1, wherein the serialized digital control information communicated between the system side circuitry and the line side circuitry includes interrupt information.

14. The data access arrangement of claim 13, wherein the line side circuitry further comprises a ring detection circuit, and wherein the interrupt information is generated by the ring detection circuit.

15. A data access arrangement, comprising:

a system side circuitry;

a programmable line side circuitry;

a digital isolation barrier that communicatively couples the system side circuitry and the programmable line side circuitry;

the programmable line side circuitry is operable to communicate across a telephone network, the programmable line side circuitry is also operable to be reconfigured based on information indicative of a condition of the telephone network; and

the system side circuitry is operable to communicate with a host system circuitry;

the digital isolation barrier is operable to communicate data and control information in a multiplexed, serialized digital datastream between the system side circuitry and the programmable line side circuitry.

16. The data access arrangement of claim 15 wherein the programmable line side circuitry identifies the information indicative of the condition of the telephone network;

and

the programmable line side circuitry is reconfigured based on the information indicative of the condition of the telephone network to facilitate improved communication across the telephone network.

17. The data access arrangement of claim 16 wherein the programmable line side circuitry is reconfigured in real time.

18. A computer system, comprising:

a data bus;

a processor coupled to the data bus; and

a modem coupled to the data bus, the modem comprising;

a high voltage isolation barrier having a first side and a second side;

system side circuit coupled to the first side of the high voltage isolation barrier, the system side circuitry configurable to communicate with host system circuitry; and

line side circuitry coupled to the second side of the high voltage isolation barrier, the line side configurable to communicate with a telephone network,

wherein data and control information are communicated between the system side circuitry and the line side circuitry across the high voltage isolation barrier in a serialized digital format.

19. The computer system of claim 18, wherein the serialized digital information contains synchronization information for synchronizing serial communications between the system side circuitry and the line side circuitry.

20. The computer system of claim 18, wherein the line side circuitry of the modem further comprises a coder/decoder, and wherein the serialized digital data information communicated between the system side circuitry and the line side circuitry includes encoded information generated by the coder/decoder and information for decoding by the coder/decoder.