ÛZIATECH
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13. PCI MEZZANINE LOCAL BUS
The ZT 8907 includes a PCI compatible local bus interface (J13) to CompactPCI
mezzanine devices. The PCI mezzanine bus operates at the same speed as the CPU
external
clock speed. Ziatech offers PCI peripheral adapters designed specifically for
this local bus interface. These adapters provide 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 or 33 MHz operation (determined by CPU speed)
•
Reduces STD bus traffic by keeping all PCI operations local
•
Single-slot occupancy capable (VGA)
See the section, "
Removing The zPM Mezzanine Card
," in Chapter 2 for details about
the mechanical connection of mezzanine devices to Ziatech CPUs.
PCI OPERATION FREQUENCY
The PCI operating frequency is derived from the frequency at which the 486 CPU is
operating. The 486 is available with several different internal clock multipliers (1X, 2X,
and 3X).
Processor
Speed (MHz)
Internal Clock
Multiplier
External
Processor Speed
PCI Operating
Frequency
25
1X
25.0
25.0
33
1X
33.3
33.3
100
3X
33.3
33.3
ADDITIONAL INFORMATION
Refer to the individual peripheral data sheets for additional details and for installation
and operating instructions.