04807113 is referenced by 20 patents and cites 6 patents.

A microprogram controlled data processing apparatus executes multi-operand instructions in which one or more operand specifiers are provided for specifying the addressing for each operand independently from the operation code of the instruction. An instruction execution unit receives a top address of a microprogram from a decoding unit, a ready status signal and a signal from the decoding unit indicating whether a destination of an operand is in a general purpose register or in a memory unit, and writes an operand into a destination address of a register on the memory unit under control of a microprogram. Because the destination of the operand is indicated by the instruction decoding unit, it is not necessary to determine this information by microinstruction execution, with the result that execution of the instruction can be performed at high speed.

Title
Microprogrammed control data processing apparatus in which operand source and/or operand destination is determined independent of microprogram control
Application Number
469803
Publication Number
4807113
Application Date
November 14, 1986
Publication Date
February 21, 1989
Inventor
Yoshihiro Miyazaki
Hitachi
JP
Takayuki Morioka
Hitachi
JP
Ryosei Hiraoka
Hitachi
JP
Tadaaki Bandoh
Ibaraki
JP
Hidekazu Matsumoto
Hitachi
JP
Agent
Antonelli Terry & Wands
Assignee
Hitachi
JP
IPC
G06F 9/36
G06F 9/34
G06F 9/42
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