C
URTISS
-W
RIGHT
C
ONTROLS
E
MBEDDED
C
OMPUTING
PMC-605 PCI-P0 B
RIDGE
M
ODULE
809524 R
EVISION
D F
EBRUARY
2009
1-7
PCI-P0 Clock
Source
Configurations
Table 1.1 and Figure 1.5 describe the different clock source configurations possible with the
PMC-605 in a two or three slot backplane configuration.
Note:
The on-board oscillator is not installed on standard versions of the PMC-605 product. Consult
the factory if you require a version of the product that includes the oscillator.
F
IGURE
1.5: PCI-P0 Clock Source Configurations
T
ABLE
1.1:
Clock Source Configurations
Configuration
Description
Fully Synchronous Clock System Slot
The PMC-605 in the system slot receives a 33 MHz clock source from its host card
and routes it over the PCI-P0 bus to the other PMC-605s. In this configuration, the bus
clock source is disabled for all PMC-605s in the system. The primary and secondary
buses of each PMC-605 module operate at the same clock speed.
Asynchronous System Slot
The PMC-605 in the system slot receives a 33 MHz clock source from its host card to
provide timing for its secondary side. The PMC-605’s primary bus uses a clock source
generated by its on-board oscillator (
see Note
) and routes this second clock over the
PCI-P0 bus. In this configuration, the primary and secondary sides can operate at dif-
ferent clock speeds.
Peripheral Slot
PMC-605 modules in the peripheral slots receive clocking from their host cards for
their secondary sides. Their primary buses use a clock source on the PCI-P0 bus.
Secondary PCI Bus
Primary PCI Bus
PCI-P0 Bus
Host PCI Bus
PCI Clock
21554
CLK0
CLK0
B
u
ffer
Fully Synchronous
System Slot
Secondary PCI Bus
Primary PCI Bus
PCI-P0 Bus
Host PCI Bus
PCI Clock
21554
CLK0
CLK0
OSC.
0-33 MHz
Asynchronous
System Slot
Secondary PCI Bus
Primary PCI Bus
PCI-P0 Bus
Host PCI Bus
PCI Clock
21554
CLK0
CLK0
Peripheral Slot
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