公开(公告)号：JP2001290762A

公开(公告)日：2001-10-19

申请号：JP2001073048

申请日：2001-03-14

Applicant: IBM

Inventor： ERIC M FOSTER ,  STEVEN B HERNDON ,  ERIC E LETTER ,  RONALD S SVECK

IPC: G06F13/362 ,  G06F13/00 ,  G09G1/16 ,  G09G5/00

Abstract: PROBLEM TO BE SOLVED: To provide a method and a structure for dynamically blocking access of a request signal to a shared bus. SOLUTION: The shared bus manages a request for access to an address space. A nonreal time master and a real time master compete about their requests for address space access by presenting the address access requests to the shared bus. An access dynamic block by R with respect to the shared bus is accomplished by using a request limiter. The request limiter is a device connected to a real time clock and uses algorithm for deciding a time when the access of R to the shared bus is made performable or nullified. The algorithm uses a window scheme that allows the access of R to the shared bus every N-th clock cycle. Here, the value of an integer N can be supplied to the request limiter by the real time master.