MIPS R10000 Microprocessor User's Manual - SGI TechPubs Library

System Interface Operations 111
Multiprocessor System Using Cluster Bus
Cycle
SysClk
SysReq0*
SysGnt0*
SysReq1*
SysGnt1*
SysReq2*
SysGnt2*
SysReq3*
SysGnt3*
SysRel*
SysCmd(11:0)
SysVal*
Figure 6-8 shows how the System interface arbitration signals are used in a fourprocessor
system using the cluster bus.
R10000 0
R10000 1
R10000 2
R10000 3
SysReq*
SysGnt*
SysRel*
SysReq*
SysGnt*
SysRel*
SysReq*
SysGnt*
SysRel*
SysReq*
SysGnt*
SysRel*
Figure 6-8 Arbitration Signals for Multiprocessor System Using the Cluster Bus
Figure 6-9 is an example of the System interface arbitration in a four-processor
system using the cluster bus.
Figure 6-9 Arbitration Protocol for Multiprocessor System Using the Cluster Bus
MIPS R10000 Microprocessor User's Manual Version 2.0 of January 29, 1997
SysReq0*
SysGnt0*
SysReq1*
SysGnt1*
SysReq2*
SysGn2*
SysReq3*
SysGnt3*
SysRel*
External
Agent
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Master EA EA EA EA - P0 P0 - P1 - P2 P2- EA EA EA EA
BlkRd
BlkRd
BlkRd RspDat RspDat
RspDat RspDat