公开(公告)号：DE3279007D1

公开(公告)日：1988-10-13

申请号：DE3279007

申请日：1982-06-02

Applicant: IBM

Inventor： COSGROVE MICHAEL R ,  FREY ALEXANDER H ,  MOORE KENNETH A ,  PELED ABRAHAM ,  RIS FREDERIC N ,  SPROUL III

IPC: G06F9/38 ,  G06F9/42

Abstract: An instruction pipeline for a data processor is disclosed, in which instruction execution is carried out in a sequence of phases which include fetching the instruction from an instruction storage, computing a data storage address from the fetched instruction, accessing the data storage at the computed address to obtain a datum operand, and then carrying out the logical or arithmetic operation on the accessed datum in accordance with the fetched instruction. Branch and stack instructions and return instructions are accommodated by providing a return address stack in the data storage, which stores the next instruction store address to be returned to after a return operation has been completed. Since the instruction address stack in the data storage cannot be directly accessed by the instruction fetching stage of the pipeline until several instruction execution phases have transpired, without degrading the performance of the pipeline, a stack register is provided in the instruction fetch stage of the pipeline which contains a duplicate of the instruction store address presently residing at the top of the instruction address stack. Then when a return instruction is encountered in the instruction fetch stage, the address of the next instruction to be returned to in the instruction storage is immediately available without interrupting the flow in the pipeline. A stack pointer in a stage of the pipeline between the instruction fetch stage and the data store access stage, then takes advantage of unused instruction phases in the pipeline, to cause the data store access stage to read the . next available instruction store address from the instruction address stack therein and load it into the stack register in preparation for the next return instruction. Thus, the data storage and instruction stacking function can be shared in the same data storage device which is accessed by an intermediate stage in the multiple phase instruction pipeline without degrading the performance of the pipeline.

公开(公告)号：CA1217874A

公开(公告)日：1987-02-10

申请号：CA466403

申请日：1984-10-25

Applicant: IBM

Inventor： GHOSH SAKTI P ,  MATTSON RICHARD L ,  PELED ABRAHAM

IPC: G06F12/00 ,  G06F3/153 ,  G06F17/30 ,  G07G1/00 ,  G06F3/02

Abstract: A METHOD FOR ACCESSING DATA FROM A SELF-SERVICE POINT-OF-SALE TERMINAL of the Invention A new use of relational database management at a host CPU interacting with selection requests from remote POS terminals is described. The new use includes (1) dynamic database generation of textual screens from the CPU relational data manager together with information for accessing a video picture source local to the POS terminal for generating selected picture screens, and (2) the textual searching of a virtual menu tree (part of a text screen) whose starting node is dependent upon the user's choice of picture or text information. The changed content of the text and picture screens is solely a function of the relationally accessed data designated by the user's menu selection.