System and method for data transmission

• US 20050100114A1
• Filed: 09/10/2004
• Published: 05/12/2005
• Est. Priority Date: 09/12/2003
• Status: Abandoned Application

• Current Assignee: Airbee Wireless, Inc.
• Original Assignee: Airbee Wireless, Inc.
• Inventors: Sundaresan, Raja, Satagopan, Ramanujam
• Application Number:
  US10/937,894
• Publication Number:
  US 20050100114A1
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 13/4286 using a handshaking protocol, e.g. RS232C link
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 7/005 Correction by an elastic buffer
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

Method and system for a power optimal coding scheme used in data transmission. The coding scheme provides for the transmission and reception of asynchronous data using a first in first out driven serial port. In one embodiment of the present invention, preamble and synchronization word patterns are selected such that the start bit of the first byte of data that follows the synchronization word synchronizes with the start bit clocking signal of the baseband receiving serial port. Thereafter, the data stream will be synchronized with the serial port.

Claims

1. A method for data transmission using a serial port, the method comprising:

enabling the serial port;

disabling a plurality of interrupts;

loading first data in a register;

enabling the plurality of interrupts;

determining if an interrupt condition is present;

determining if the register contains the first data;

loading second data in the register if the interrupt condition is present and the register does not contain the first data; and

transmitting the second data.

2. The method of claim 1, further comprising enabling a plurality of flags.

3. The method of claim 2, wherein the plurality of flags comprises an interrupt flag, an underrun interrupt flag, an empty flag and an almost empty flag.

4. The method of claim 3, further comprising determining if the underrun interrupt flag is set if the interrupt condition is present;

and if the underrun interrupt flag is set, resetting the register, disabling the reset register, and clearing the interrupt flag.

5. The method of claim 4, further comprising determining if the empty flag is set if the interrupt condition is present and the underrun interrupt flag is not set;

and if the the empty flag is set, loading the second data in the register, clearing the empty flag, and clearing the interrupt flag.

6. The method of claim 5, further comprising determining if the almost empty flag is set if the interrupt condition is present, the underrun flag is not set, and the empty flag is not set;

and if the almost empty flag is set, loading the second data in the register, clearing the almost empty flag, and clearing the interrupt flag.

7. A coding scheme for transmission of a data stream to a receiver, comprising:

generating a preamble;

generating a synchronization component having a first portion and a second portion;

obtaining a payload;

generating an error control; and

transmitting the data stream to the receiver;

wherein the synchronization component synchronizes the receiver and controls the reception of the payload, and the first portion of the synchronization component is selected from a group consisting of C0, E0, and F0.

8. The coding scheme of claim 7, wherein the second portion of the synchronization component is DD.

9. The coding scheme of claim 8, further comprising modifying the synchronization component based on the data stream received by the receiver.

10. The coding scheme of claim 9, further comprising modifying the synchronization component based on the preamble received by the receiver.

11. The coding scheme of claim 7, wherein the first portion of the synchronization component is CO and the second portion of the synchronization component is DD.

12. The coding scheme of claim 11, further comprising modifying the first portion of the synchronization component to one of C0, 07, and EB;

and modifying the second portion of the synchronization component to one of DD, B5, AD, and C0.

13. A system for transmitting a data stream according to the coding scheme of claim 7.

14. The system of claim 13, further comprising:

a plurality of registers for storing at least a portion of the data stream;

a rate control component for control the transmission rate of the plurality of registers; and

a transmission control component for transmitting the data stream stored in the plurality of registers.