公开(公告)号：GB2490831B

公开(公告)日：2018-12-12

申请号：GB201214869

申请日：2011-04-07

Applicant: IBM

Inventor： ROY CIDECIYAN ,  HISATO MATSUO ,  THOMAS MITTELHOLZER ,  KENJI OHTANI ,  PAUL SEGER ,  KEISUKE TANAKA

IPC: G11B20/18

公开(公告)号：GB2500529B

公开(公告)日：2020-03-25

申请号：GB201311026

申请日：2011-10-06

Applicant: IBM

Inventor： HISATO MATSUO ,  RIKA NAGAHARA ,  KENJI OHTANI

IPC: G06F13/16 ,  G06F13/366

Abstract: The present invention includes a plurality of CPUs using memory as main memory, another function block using memory as a buffer, a CPU interface which controls access transfer from the plurality of CPUs to memory, and a DRAM controller for performing arbitration of the access transfer to the memory. Therein, the CPU interface causes access requests from the plurality of CPUs to wait, and receives and stores the address, data transfer mode and data size of each access, notifies the DRAM controller of the access requests, and then, upon receiving grant signals for the access requests, sends information to the DRAM controller according to the grant signals, whereupon the DRAM controller receives the grant signals, and on the basis of the access arbitration, specifies CPUs for which transfers have been granted so as to send the grant signals to the CPU interface.