Patents by Inventor Surendra Mandava

Surendra Mandava has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Multiprocessor system for digital signal processing
    Patent number: 6327648
    Abstract: A novel multi-DSP system allows a main DSP to operate concurrently with an auxiliary DSP for implementing a filter algorithm. The main DSP and auxiliary DSP have separate program memories but share the same data memory. The auxiliary DSP program memory is mapped to the main DSP program memory to allow the main DSP to download filter process instructions from its program memory into the auxiliary DSP program memory. The auxiliary DSP fetches the instructions from its program memory to execute them. The auxiliary DSP is prevented from access to the shared data its program memory when this memory is occupied by the main DSP. An arbitration mechanism gives the auxiliary DSP access to the data memory only when the main DSP is not using this memory.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: December 4, 2001
    Assignee: Cirrus Logic, Inc.
    Inventors: Shahin Hedayat, Surendra Mandava
  • Selective shadowing of registers for interrupt processing
    Patent number: 5642516
    Abstract: Interrupts are prioritized such that selected interrupts use shadow registers to save the current state of the machine, whereas other interrupts use a software implemented interrupt service routine (ISR) to save and restore the current machine state. Hence, the number of nested interrupts that can be serviced will not be limited to the depth of register shadowing.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: June 24, 1997
    Assignee: Cirrus Logic, Inc.
    Inventors: Shahin Hedayat, Surendra Mandava