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1、9PCI-to-PCIB#!9中国科学技术大学近代物理系(合肥 230027) 宋克柱 张凌云 杨小军 王砚方K 1 从电气负载和系统性能考虑,一条PCI总线不能驱动过多的PCI设备bPCI系统扩展必须使用PCI桥设备b文章介绍了PCI-to-PCI桥的概念a原理a结构及PCI总线扩展方法,简要介绍了PCI-to-PCI透明桥Intel 21154的特点及应用设计注意事项b1oM PCI-to-PCI桥 PCI总线 CompactPCI总线 总线扩展1 PCIaCompactPCI9Ld+M?ZK9L,gz-|V9LVME9L7nb1mPCI9Lza?a,CompactPCI9LbPCI9L3
2、3MHzHa32zHq/r132Mbyte/ sz,66MHzHa66zHq/r528Mbyte/ szbd!9H,3Td!9,1dZ!9bPCI9LZ,APPCIB!b2 BHPCI9LTV!,9L|?T,7O=BHPCI9L!Vd?byPCI9LZ9L,B!( master).H!A,V!#hP9LA!.?bYVd=69FBHHPCI9L,is!,t5V%bd=Z6BHPCI9L,BZEPPCI-to-PCI(P2P)BdZbP2PBHPCI9LbP2PB!;V3PCI9L,9VPCIZB5bP2PB4BHPCI9L6BHPCI9LWB,PCI9LMBb,PCI9LVB-!PCIZbPCI
3、?SKH9L,7db,d=A?_=9LF!4bd!99VP2PBb2. 1 dm1UP2PBbP2PB1BQgPCI9L0, P2PB1=QgPCI9L1bP2PB2BQgPCI9L1, P2PB2=QgPCI9L2bB(=Q)9LI|9BI|,dBI|0bm1 P2PBU2. 2 sPCIBT,VP2PBsiBdiBbiB( transparent ) :Y9LZbB=Q!BQdib=Q!?BQdebBQ=QHA,50/62002M3 中国传感器 http: / / www. sensor. com. cn ( 133) 5%MbBQ=Qi,BQ=QW.YT,JrbdiB( non-tran
4、sparent) :Y3T?I/ O5b),=QBQdVnb=Q)e0dbBQ=QHbBQ=Q,BQ=QWVJrb2. 3 P2PBBBmasterB6BS!( target)W.bP2PBm2U,/+vF:7iaBQmasterga=QtargetgaBQtargetga=Qmastergau(V)a/u(V)bm2 P2PBvBmasterg6BtargetgBb7iBQPCIgbP2PB1F:mas-tergatargetgbBmastertargetgAPCI9L?Sb2. 4 8?P2PBPCI9L?b8, P2PBTxHPCI9LWY, P2PBA/?:( 1)SjBPCI9L(
5、transaction) ,i%|YVB.6BHPCI9LbBBH9L1.6BH9LH,AmasterS,#S9L!bmastertarget,=S9LS9LWP2PBVnb( 2)BSj=9LSERR# ( system er-ror) ,Tr,5|.B9LSERR#b( 3)BSjB9LRST # ,Tr,5|.=9LRST#b2. 5 rP2PBS7iBF( base)K( limit)7i,sYI/ OS(V)aMemoryI/ OS(A)a4|MemoryS(V)bbase7ilimit7iB|VB.6BSbB9L,S=,BA|VBQ/.=Qb=9L,S=,BA|V=Q.BQbm3U
6、P2PBi%I/ OS#.UimbS#.NMbm3 PCIBi%I/OS#.3 !921154Intel/P2PiB,-?P2PBb3X|21154B3TCompactPCIV,211541?PCI9LZb/e121154#!9iYb3. 1 211541+21154/+:PCI9L?S2. 2;BQ=Q64Z|;BQ=Q33MHz66MHzH;PCIaI/ O#Memory,H( de-layed transaction) ;_( posted)i%1523u() ,_/i%883u() ;_1523u,_/91523u;BQ=QVH96 ( 134) 中国自动化 http: / / www. automation. com. cn 50/62002M3LT,M7;410=QH;49!VI25)9L;5V3. 3V|;4IEEE 1149. 1SJTAGgb3. 2 21154v211541/+vF:7iaBQ=Qgea_/Ya_Ya=Q9Lb21154m4U
