Sun Microsystems Sun Blade 1000 Service Manual page 292

The PCI B leaf supports six master devices. The Sun Blade 1000 and Sun Blade 2000
workstations include the following five devices: PCIO-2, three slots, and the 876
SCSI controller.
C.1.4.2 PCIO-2
The PCIO-2 contains a multi-function PCI interface and four leaves for each of the
supported interfaces: Ethernet (10/100 Mbit), USB, IEEE 1394, and EBus. The figure
below is a block diagram of the PCIO-2 ASIC:
Bus adapter
64 bit PCI bus (Revision 2.1 compliant)
33 MHz
Double write buffers
MISC
JTAG
Bist
FIGURE C-7
C-20 Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
Ethernet channel
Enet DMA
2 DMA
channels
GEM
10/100
100/200/400
Mbit/sec.
Mbit/sec.
MII
Ethernet PHY
Ethernet 10/100 BASE- T
PCIO-2 Block Diagram
PCI Bus
PCI
configuration
space
(multi-function)
1394 channel
1394 DMA USB DMA
12 DMA
1 DMA
channels channel
1394 Link USB control
Hub
12 Mbit/sec.
USB
1394 PHY
USB channel EBus channel
EBus DMA
4 DMA
channels
EBus control
5 Mbit/sec.
EBus