CHAPTER 13. PCI MEZZANINE LOCAL BUS
The ZT 8905 includes a PCI compatible local bus interface to industry standard PCI mezzanine
devices. The bus operates at half of the CPU
external
clock speed. Ziatech offers PCI peripheral
adapters designed specifically for this local bus interface. These adapters give superior performance
over STD bus solutions by running with up to four times the data width and up to four times the
operating frequency. Major features of the PCI interface are listed below.
•
25, 30, or 33 MHz operation (Determined by CPU speed)
•
Reduces STD bus traffic by keeping all PCI operations local
•
Single-slot occupancy capable (VGA)
PCI OPERATION FREQUENCY
The PCI operating frequency is derived from the frequency at which the Pentium CPU is operating.
The Pentium is available with several different internal clock multipliers (1.5X, 2X, 2.5X, and 3X).
Processor
Speed (MHz)
Internal Clock
Multiplier
External
Processor Speed
PCI Operating
Frequency
75
1.5X
50.0
25.0
90
1.5X
60.0
30.0
100
1.5X
66.6
33.3
120
2.0X
60.0
30.0
133
2.0X
66.6
33.3
150
2.5X
60.0
30.0
166
2.5X
66.6
33.3
180
3.0
60.0
30.0
200
3.0
66.6
33.3
ADDITIONAL INFORMATION
Refer to the individual peripheral data sheets for additional details and installation and operating
instructions.
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Содержание ZT 8905
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