System for selectively masking data in a branch address register and replacing the microinstruction address register by the masked data
US5210833A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1990 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Jan 25, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/264
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A microprogram control unit is provided for processing conditional branch micro-instructions stored in a micro-instruction memory to control the function of an information processing apparatus. The unit includes a microprogram counter coupled to the micro-instruction memory and contains an address for accessing the micro-instruction stored in the memory. A circuit is provided for registering the micro-instruction received from the micro-instruction memory and having an address field coupled to the microprogram counter and a condition field for designating a condition to be judged. A detecting circuit is coupled to the registering circuit to receive the micro-instruction therefrom and for detecting the conditional branch micro-instruction. Further, there is provided a circuit for generating status signals representing respectively a plurality of the status of the information processing apparatus and selectively outputting anyone of the status signals. There is also provided a circuit for judging coincidence between the status signal selectively outputted from the status signal generating circuit and the condition designated by the content of the condition field of the micro-instruct…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.