The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Jun. 29, 1998
Pankaj Malhotra, Sunnyvale, CA (US);
Cisco Technology, San Jose, CA (US);
Abstract
Provided is a method for preventing memory overrun in a data transmission system. The data transmission system includes a CPU, an HDLC controller having a receive buffer, and a memory shared between the CPU and the HDLC controller. The method includes initializing the HDLC controller by writing to the shared memory. The CPU terminates data reception at the HDLC controller by sending a data reception termination instruction to the controller. The CPU receives an acknowledgement instruction from the HDLC controller responsive to sending the data reception termination instruction. The CPU creates an empty buffer in the shared memory responsive to receiving the acknowledgement instruction from the controller. Thereafter, the CPU makes receive descriptors included in the shared memory point to the empty buffer. The HDLC controller subsequently transfers the data contained in its receive buffer to the empty buffer in shared memory.