24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No.153 /DEL/1997 A (22) Date of filing of Application: 20/01/1997
(54) Title of the invention: “A SYSTEM FOR DATA TRANSFER AND BUS
MANAGEMENT OVER A BUS STRUCTURE.”
(51) International Classification 7 : G06F 13/36
(30) Priority Data:
(31) Document No.: 08/594,651
(32) Date: 02/02/1996
(33) Name of convention country: USA.
(66) Filed U/s 5(2): NIL
(61) Patent of addition to application No.: NA
(62) Filed on: NA
(63) Divisional to Application No.: NIL
(64) Filed on: NA
Total No Of Page: 60
(57) Abstract
(71) Name of the applicant:
SONY ELECTRONICS,INC.,
Address of the Applicant:
Sony Drive, Park Ridge, New Jersey 07656-
8003, United States Of America.
(72) Name of the Inventor:
SCOTT D. SMYERS
BRUCE FAIRMAN;
An application programming interface implements and manages isochronous and asynchronous
data transfer operations between an application and a bus structure. During an asynchronous
transfer the API includes the ability to transfer any amount of data between one or more local data
buffers within the application and a range of addresses over the bus structure using one or more
asynchronous transactions. An automatic transaction generator may be used to automatically
generate the transactions necessary to complete the data transfer. The API also includes the ability
to transfer data between the application and another node on the bus structure isochronously over a
dedicated channel. During an isochronous data transfer, a buffer management scheme is used to
management scheme is used to manage a linked list of data buffer descriptors. This linked
descriptor list can form a circular list of buffers and include a forward pointer to the next buffer in
the list and a backward pointer to the previous buffer in the list for each buffer. The linked
descriptor list may also form a linear list to which the application can append additional buffers or
remove existing buffers from the list. During insochronous transfers of data, the API provides
implementation of a resynchronization event in the stream of data allowing for
resynchronizationby the application to a specific point within the data. Implementation is also
provided for a call back routine for each buffer in the list, which calls the application at a
predetermined point during the transfer of data.
18136