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Conditional branch unit for microprogrammed data processor

  • US 4,338,661 A
  • Filed: 05/21/1979
  • Issued: 07/06/1982
  • Est. Priority Date: 05/21/1979
  • Status: Expired due to Term
First Claim
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1. A data processor adapted for microprogrammed operation for executing a plurality of macroinstructions, the data processor comprising:

  • (a) first means for storing a macroinstruction having a field containing conditional branch information;

    (b) a control store having an input port for receiving a control store address and an output port providing a control word which includes a conditional branch selection field; and

    (c) means for storing conditional signals indicative of the operational state of the data processor,(d) conditional branch control means coupled to the first means, coupled to the output port of the control store, and coupled to the means for storing conditional signals, the conditional branch control means comprising means for decoding the conditional branch selection field to provide a selection signal for selecting branch information from either the macroinstruction branch field or the control word conditional branch selection field, and means responsive to the selected branch field information and the conditional signals for providing branch execution address information to the control store.

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