US 7,454,539 B2Granted

Method for transferring variable isochronous data and apparatus therefore

AssigneeSamsung Electronics Co., Ltd.

InventorsYoon-jick Lee, Sung-il Kang

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Abstract

A method for transferring variable isochronous data and an apparatus therefor are provided. The method for transferring variable isochronous data includes the steps of (a) determining isochronous transfer to be terminated when the bus is in an idle state for a time interval which is larger than an isochronous gap period, (b) detecting a residual gap having a time interval which is larger than the time interval of an isochronous gap and smaller than the time interval of a subaction gap, (c) checking whether bandwidth for the transfer of isochronous data remains when the residual gap is detected in the step (b), and (d) transferring the isochronous data when it is determined that the bandwidth remains in the step (c). According to the variable isochronous data transfer method, it is possible to maximize the isochronous transfer by selectively using the residual bandwidth, which is assigned for the transfer of the isochronous data but is not used for the real transfer of the isochronous data, for the transfer of the isochronous data.

Claims7

Dependent claims

A program embodied on a tangible computer-readable storage medium, which when executed by a computer, the program causes the computer to execute a variable data transfer method for isochronously transferring data within a predetermined time on a bus, comprising the steps of:

(a) determining that isochronous transfer of data is terminated when the bus is in an idle state for a time interval longer than an isochronous gap period and detecting a residual gap having a first predetermined time interval which is larger than the time interval of the isochronous gap and smaller than the time interval of a subaction gap;
(b) determining whether the detected gap is an isochronous reset gap having a second predetermined time interval which is larger than the first predetermined time interval and smaller than the time interval of the subaction gap;
(c) enabling an isochronous arbitration reset bit when the detected gap is determined to be the isochronous reset gap in the determination step;
(d) determining whether the isochronous reset bit is enabled when it is determined that the detected gap is not the isochronous reset gap in the determination step and proceeding the process to an asynchronous phase;
(e) determining whether real-time transfer packets exist;
(f) checking timing when real-time transfer packets exist in the step (e), throwing away the packets which deviate from a real-time reference, and transferring the packets which do not deviate from the real-time reference;
(g) determining whether bandwidth is sufficient with respect to packets which are not real-time packets and packets which are real-time packets and do not deviate from the real-time reference, and performing arbitration with respect to real time packets and packets which are not real-time;
(h) transferring the packets when the arbitration is successful;
and
(i) transiting a phase to the asynchronous phase.

7 more elements

An isochronous data transfer apparatus for isochronously transferring data within a predetermined time interval on a bus, comprising:

means for determining that isochronous transfer of data is terminated when the bus is in an idle state for a time interval longer than an isochronous gap period and detecting a residual gap having a first predetermined time interval which is larger than the time interval of the isochronous gap and smaller than the time interval of a subaction gap;
means for determining whether the detected gap is an isochronous reset gap having a second predetermined time interval which is larger than the first predetermined time interval and smaller than the time interval of the subaction gap;
means for enabling an isochronous arbitration reset bit when the detected gap is determined to be the isochronous reset gap by the detection means;
means for determining whether the isochronous reset bit is enabled when it is determined that the detected gap is not the isochronous reset gap by the determination means and driving an asynchronous transfer mode when the isochronous reset bit is not enabled;
means for determining whether real-time transfer packets exist;
means for checking timing when real-time transfer packets exist, throwing away the packets which deviate from a real-time reference, and transferring the packets which do not deviate from the real-time reference;
means for determining whether bandwidth is sufficient with respect to packets which are not real-time packets and packets which are real-time packets and do not deviate from the real-time reference;
means for transferring the packets when the arbitration is successful;
and
means for performing asynchronous transfer of data,
wherein the gap detection means comprises:
a decoder for determining a kind of the gap by determining the time interval of an idle state;
and
a gap detector for detecting a concerned gap according to the determination value output from the decoder.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/498,097Filed 3 Aug 2006 · division
Priority: KR 98-4949318 Nov 1998
Published: US 2006/0282570 A114 Dec 2006
Granted: 18 Nov 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 12/40058
High-speed IEEE 1394 serial bus: isochronous transmission
G06F 13/4282
Bus transfer protocol, e.g. handshake; Synchronisation: on a serial bus, e.g. I2C bus, SPI bus
H04L 12/5601
Packet switching systems: transfer mode dependent, e.g. ATM
H04L 12/6418
Hybrid switching systems: hybrid transport

Family

Application09/441,955Parent of this division · filed 17 Nov 1999
Application10/465,628Parent of this division · filed 20 Jun 2003
US 2006/0282570 A1Pre-grant publication · published 14 Dec 2006
US 7,155,543 B2Parent of this division
US 6,611,886 B1Parent of this division
US 2003/0217220 A1Published application
US 7,454,539 B2This patent

From the US filing history. Foreign family members aren’t listed.