Sun Microsystems SUN BLADE 150, Service Manual

Page: 185 / 218

Appendix C Functional Description C-11
The motherboard has an LED which shows the ethernet mode (
FIGURE C-2
). If the
LED is flashing, the ethernet is operating at 100 Mbps. If the LED is not flashing, the
ethernet is operating at 10 Mbps.
C.5.5.2 USB
The PCIO-2.x USB interface is an industry standard low-cost serial bus intended for
slower peripheral devices such as keyboard and mouse. The protocol on the USB is
of a master/slave polling nature with the following features:
■
OpenHCI host controller
■
1.5 and 12 Mb/s transfer rate
■
Four host ports
The Sun Blade 150 uses two USB ports for the keyboard and mouse. See Appendix E
for details.
C.5.5.3 IEEE 1394
The Sun Blade 150 provides a dual IEEE-1394 interface for faster asynchronous
peripheral devices of transfer rate up to 400Mb/s.
Note – Only one Sun Visual Collaboration Kit (1394 camera) is supported at one
time due to system bandwidth limitations. The minimum DIMM configuration for
using the Sun Visual Collaboration Kit is 256 Megabytes.
C.5.6 PCI to PCI Bridge ASIC
This ASIC provides the PCI bus extension for plug-in PCI devices and is compliant
with PCI Specification 2.1 and PCI Power Management Specification 1.0.
C.5.7 Flash PROM
The Sun Blade 150 motherboard contains 1 Mbyte of flash memory, which is
connected to the EBus of the PCIO-2.x ASIC. The flash PROM is an 8 Mbit, 5.0 volt
flash memory with faster than 120ns access time.
The 1 Mbyte of the PROM is divided into two halves, the OpenBoot PROM and the
Power-On Self-Test (POST). The OpenBoot PROM and POST image reside in a
separate address space off of the EBus space. There is a ROMBO connector for