Sun Microsystems Netra T4 AC100, Service And System Reference Manual

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10-12 Netra T4 AC100/DC100 Service and System Reference Manual • August 2001
SBC is composed of a Sun CrossBar Interconnect interface block and two leaf blocks
(the UPA64S leaf block is not used in the Netra T4 system):
■
PCI A leaf block
■
PCI B leaf block
The following figure depicts the micro architecture of the SBC ASIC:
FIGURE 10-7
SBC Block Diagram
Data Access Command
DMA FSM PIO FSM
Merge Buffer
UPA64S
Misc/
Arb
JTAG
PBM MDU
STC MMU
CTRL
PCI-B
Leaf
5
PBM MDU
STC MMU
CTRL
PCI-A
Leaf
Leaf
Ctrl
10 MHz 150 MHz
66 MHz
64-bit, 33 MHz PCI, 6 devices 64-bit, 66/33 MHz EPCI, 2/4 devices
IChip
7
JTAG
Data/ECC Address Arb/Or
72
Ctrl
Clocks/Misc
Sun Crossbar
Interconnect
Interface
Block
(not
used)