Sun Microsystems SPARCengine Ultra AXi, Техническое руководство, Страница: 57 / 174

Chapter 3 Functional Description 3-9
3.3.14 Memory Bus
The UltraSPARC IIi CPU manages all memory control signals and multiplexes the
address lines for standard DRAMs. The data bus is 128-bits wide plus-16 bits ECC.
This 144-bit wide bus is converted to a 72-bit bus using 6 multiplexer chips to
interface with the CPU.
3.3.15 UPA64S Bus
The Sun Creator Graphics card family is supported for 2D and 3D graphics. The card
interfaces to the motherboard with a UPA64S connector, and to standard Sun
monitors with a 13W3 video connector. This is an internal bus only.
3.3.16 PCI 66 Bus
The UltraSPARC IIi CPU module has a PCI-66 bus. The bus operates at 66 MHz, 3.3V
and has characteristics similar to PCI specifications. The PCI-66 bus is bridged to the
PCI-A and PCI-B buses by the Sun ASIC Advanced PCI Bridge (APB) SME2411BGA-
66. This is an internal bus.
3.3.17 EBus2
This is a versatile 8-bit data, 24-bit address bus similar to an ISA bus. Components
on this bus provide economical interfaces to the Sun keyboard and mouse, PS/2
keyboard, PS/2 mouse, printers, floppy drives, serial ports, flash memory and
NVRAM/TOD devices. This is an internal bus only.
3.4 Advanced System Monitoring (ASM)
The ASM features implemented in the Ultra AXi monitor critical temperatures,
voltages, and the optional cooling fans. The ASM features will issue warnings for
high temperatures, low voltage, optional cooling fan failure and will initiate system
shutdown due to high temperature. ASM features also control the operation of the
two optional cooling fans. These functions and features are implemented internally
using dedicated circuitry that operates on the I2C serial-bit-bus. To support these
functions and features, OBP 3.10.4 or later and Solaris 2.6 HW: 3/98 or later is
required.