C-10 Sun Blade 150 Service Manual • June 2002
C.5.3.4 SMBus Interface
The SMBus host controller provides the communication channel with other serial
devices through SMBus protocol. In the Sun Blade 150 system, this SMBus is
connected to the four SDRAM DIMM modules, so that on system power-up
OpenBoot PROM can access the information regarding each DIMM type and
configuration stored inside the serial EEPROM on each DIMM module.
C.5.4 PCI Graphics
C.5.4.1 ATI Rage XL ASIC
ATI Rage XL is the graphics controller in a 256-pin Ball grid array (BGA) package.
The controller provides PCI based graphics with a 64 bit memory path supporting
SGRAM.
C.5.4.2 Graphics Memory
The ATI Rage Pro memory interface supports a 64-bit memory path. The system has
8 Mbytes of SGRAM on the motherboard. The system uses two chips, based on a 32
Mbit SDRAM (512k x 32 x 4 banks).
C.5.5 PCIO-2.x ASIC
The PCIO-2.x ASIC is a 256-pin BGA package. This ASIC contains the following
interfaces:
■ EBus Channel Engine, which can interface standard off-the-shelf ISA devices
■ Full-duplex Ethernet Engine with Media Access Control function, providing a
10/100 Mbps network interface
■ IEEE-1394 standard interface capable of 100, 200, 400 Mbit/sec transfers
■ Open HCI compliant USB host controller capable of supporting 1.5, 12 Mbit/sec
transfer rate
C.5.5.1 Ethernet
The PCIO-2.x ASIC includes a 10/100Mbps ethernet MAC. The Sun Blade 150
system uses the Lucent LU3X31T PHY chip attached to the PCIO-2.x MII interface.
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