公开(公告)号：DE2716520A1

公开(公告)日：1977-11-10

申请号：DE2716520

申请日：1977-04-14

Applicant: IBM

Inventor： BIRNEY RICHARD EUGENE ,  DAVIS MICHAEL IAN ,  HOOD ROBERT ALLEN ,  GRAYBIEL LYNN ALLAN ,  BOCA RATON FLA ,  KAHN SAMUEL ,  OSBORNE WILLIAM STEESE ,  BOURKE DONALL GARRAID ,  PUTTLITZ FREDERIC JOHN

IPC: G06F12/02 ,  G06F9/20 ,  G06F13/06

Abstract: The look ahead circuits are for an address relocation translator which contains stacks of segmentation registers (SR's), each of which may be loaded with an assigned address of a physical block in a main memory. An additional pair of bit positions are provided with each SR to receive look ahead bits from decoder loading circuits which decode a physical address being loaded into the SR to indicate the storage unit containing the addressed block. During each subsequent address translation the loaded look ahead bits are outgated while the block address is being read from an SR. The look ahead bits are decoded for selecting the required storage unit component of the main memory, and a translator interface is switched to that unit. The look ahead bits are handled by parallel high speed circuits so that the required storage unit is selected before a storage unit cycle is generated by the translator for accessing the addressed block.

公开(公告)号：DE2430693A1

公开(公告)日：1975-01-16

申请号：DE2430693

申请日：1974-06-26

Applicant: IBM

Inventor： BOUKNECHT MAX ABBOTT ,  DAVIS MCHAEL IAN ,  BOCA RATON FLA ,  MITCHELL JUN MATTHEW JOSEPH

IPC: G06F13/12 ,  G06F15/16 ,  G06F3/04

公开(公告)号：DE2718019A1

公开(公告)日：1977-11-10

申请号：DE2718019

申请日：1977-04-22

Applicant: IBM

Inventor： BIRNEY RICHARD EUGENE ,  DAVIS MICHAEL IAN ,  GRAYBIEL LYNN ALLAN ,  HOOD ROBERT ALLEN ,  BOCA RATON FLA ,  KAHN SAMUEL ,  OSBORNE WILLIAM STEESE

IPC: G06F9/312 ,  G06F12/06 ,  G06F12/14 ,  G06F13/12 ,  G06F9/18

Abstract: The equate operand spaces (EOS) system provides control over the addressabilities accessed by means of different address keys in an address key register (AKR) in a processor. Executing instructions, and their source and sink type operands may have different address keys in the AKR and therefore different addressibilities. When enabled, the EOS control forces each source operand fetch to occur within the sink operand addressability specified in the AKR, even though the AKR explicity contains 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 or disabled in the processor.