| 摘要 |
<p>EQUATE OPERAND ADDRESS SPACE CONTROL SYSTEM Equate operand spaces (EOS) control over the addressabilities provided by different address keys in an address key register (AKR) in a processor. When enabled, the EOS control forces each source operand access to occur within the sink operand addressability specified in the AKR, even though the AKR explicitly specifies a different addressability for source operands. When the EOS feature is disabled, the source operand addressability contained in the AKR is used when fetching source operands. An EOS field in the AKR stores whether the EOS state is enabled in the processor. The EOS field is connected to active address key (AAK) select circuits. When the EOS state is enabled, it outgates from the AKR the sink operand address key as the AAK in response to a source operand request. The source operand address key in the AKR is not disturbed by EOS enablement or disablement. Upon disabling the EOS state, the AAK select circuits resume any separate addressabilities available in the AKR for the source and sink operands.</p> |
