发明授权
- 专利标题： Microprogram controlled data processing system
- 专利标题（中）： 微程序控制数据处理系统
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申请号： US869003申请日： 1978-01-12
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公开(公告)号： US4197578A公开(公告)日： 1980-04-08
- 发明人: Kenichi Wada , Kanji Kubo
- 申请人： Kenichi Wada , Kanji Kubo
- 申请人地址： JPX
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX
- 优先权： JPX52-2397 19770114
- 主分类号： G06F9/22
- IPC分类号： G06F9/22 ; G06F9/26 ; G06F9/28 ; G06F9/30 ; G06F9/318 ; G06F9/34 ; G06F9/38 ; G06F9/16
摘要：
A circuit outputs different subsidiary address data depending on operand address data contained within operand designation fields and operation codes of system instructions. A control storage, which stores microinstructions, is accessed for the initial microinstructions, contained within microinstruction sequences for system instructions, at storage locations specified by the operation codes and the subsidiary address data. As a result, different microinstruction sequences for system instructions with the same operation code can be initiated depending on the operand address data, without using any microinstructions for testing the operand address data.
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