US Patent 7739469 Patching ROM code

Patent 7739469 was granted and assigned to Freescale Semiconductor on June, 2010 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Freescale Semiconductor

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7739469

Date of Patent

June 15, 2010

Patent Application Number

11268827

Date Filed

November 8, 2005

Patent Primary Examiner

‌

Sanjiv Shah

Patent abstract

An instruction set is executed from Read Only Memory (ROM). When a current instruction in the instruction set corresponds to a reserved patch memory block of ROM, a Random Access Memory (RAM) index and a ROM return address are loaded into a memory map, and a program counter is set to a first reserved ROM address. After jumping the program counter to the first reserved ROM address, the program counter is jumped to RAM based on the RAM index to execute a patch code, which includes at least one instruction to set the program counter to a second reserved ROM address. When the program counter equals the second reserved ROM address, the ROM return address is retrieved. Then the instruction set is executed from ROM based on the ROM return address.