Title:
【発明の名称】ROMデータワードの更新を可能にするための回路システム
Document Type and Number:
Japanese Patent JPH02503248
Kind Code:
A
Abstract:
A non-reprogrammable ROM holding microinstruction words cooperates with a Content Addressable Memory made of a TAG Memory and Data Memory. Portions of the locations in the TAG Memory have the same address as certain locations in the ROM so that when these selected addresses occur, a multiplexer will select the updated data from the Data Memory rather that from the ROM. The entire system is placed on one chip and provides great spatial surface savings over that which would be required if only a Static RAM were used for a control storage unit to hold the microinstruction words.
Inventors:
Converser, Sebat
Application Number:
JP50270989A
Publication Date:
October 04, 1990
Filing Date:
February 17, 1989
Export Citation:
Assignee:
Unisys Corporation
International Classes:
G06F9/06; G06F9/26; G06F11/28; G06F9/22; (IPC1-7): G06F9/06; G06F9/22; G06F11/28
Attorney, Agent or Firm:
Fukami Hisaro (2 outside)