Publication No. PEX430-0HH/1QD
Configuration and Power-Up 15
CAUTIONS
While these jumpers are fitted the PMC clock frequency will be over-ridden with the frequency selected by
the jumpers (see 3.1.1 ). It is not expected that this will be an issue since the setting of the upstream port
is expected to be done during a configuration operation on the PEX430 and not for normal operation.
Depending on how the NVMRO signal for the PEX430 is connected to the NVMRO signal for other VPX
cards all the non-volatile memory devices in the system could be put into a writable state.
It is possible to set the upstream port to a port that is not configured. For example, if the ports are set up in
x8 x8 x0 x0 mode then only Ports 0 and 1 are valid ports (the other two ports have a zero lane width). In this
case, if the upstream port was set for Port 2 (or 3) then no upstream port will be enabled.
3.1.4
PMC X100 Selection (E1 and E3)
The PEX430 supports the operation of a PMC card with PCIX capability. It is possible
to configure the operation of the PCIX PMC card for either 100 MHz or 133 MHz
operation using Jumper E3 pins 1-2, as shown in Table 3-5.
Table 3-5
PEX430 E1 Pins 3-4
PEX430 E3 Pins 1-2
Description
Open
Open
PMC clock will be set to 100 MHz PCIX mode (if PMC supports PCIX operation)
Open
Closed
PMC clock will be set to 133 MHz PCIX mode if PMC supports PCIX operation)
Closed
Don’t Care
PMC clock will be set manually by other E1 jumpers
NOTE
If a PMC card that does not have PCIX capability is fitted, then jumper E3 pins 1-2 has no effect.
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