Sun Microsystems Sun Blade 1000 Service Manual page 290

SBC is composed of a Sun CrossBar Interconnect interface block and three leaf
blocks:
PCI A leaf block
PCI B leaf block
UPA64S leaf block
The following figure depicts the microarchitecture of the SBC ASIC:
10 MHz
JTAG
JTAG
ctrl
5
Clocks/Misc
66 MHz
IChip
FIGURE C-6
C-18 Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
Arb/Or Data/ECC
72
150 MHz
Misc/
Data access
arb
Merge buffer
DMA FSM
PCI-B
CTRL Leaf
MMU STC
MDU PBM
7
64-bit, 33 MHz PCI, 6 devices 64-bit, 66/33 MHz EPCI, 2/4 devices
SBC Block Diagram
Ctrl Address
Command
Sun Crossbar
Interconnect
Interface
block
PIO FSM
PCI-A
CTRL Leaf
MMU STC
MDU PBM
120 MHz
UPA64S
2 ports
Addr
UPA64S
Leaf
Ctrl
Data
64