XVME-6500
USER
’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 37 -
http://www.acromag.com
- 37 -
www.acromag.com
When an XMC module is installed in the Upper Site, the PEX8114 PXIe to PCI-X
Bridge is automatically disabled and all 8 lanes of the PCIe interface for the
Upper site are connected to the XMC module. If this automatic mechanism
does not work with a particular XMC module,
SW2-2
may be used to force the
site to work in XMC mode.
Note:
Processor XMC modules are not supported on the XVME-6500.
3.16.2 PMC Modules
PMC modules can be used in either or both Upper and Lower Expansion Sites
on the XVME-6500, however if one PMC module is used in conjunction with
one XMC module the PMC module must be in the Upper Site.
When a PMC module is installed in the Upper Site, the PEX8114 PXIe to PCI-X
Bridge is enabled and connected using lanes of the PCIe interface for the
Upper Site. If PMC modules are not recognized, check
SW2-2
to be sure it is
not forcing the sites to work in XMC mode.
The PMC interface uses PCI-X and can function at 133MHz, 100MHz, 66MHz
or 50MHz bus speeds.
SW2-1
may be used to select a maximum bus speed, or
allow it to be automatic based on the PMC card(s) installed.
Note:
The
VITA 39 Specification, "
PCIX Auxiliary Standard for PMCs"
states
that "Dual PMC site carriers shall under-clock the bus at 100MHz when
133MHz capable PMC(s) are installed and the 133MHz mode is enabled."
Instability may result with some 133MHz capable PMC modules with the bus
speed set at 133MHz. Under-clocking to 100MHz using
SW2-1
is
recommended when 133MHz module(s) are installed.
Note:
Processor PMC modules are not supported on the XVME-6500.
3.16.3 PMC/XMC JTAG Interfaces
Some PMC/XMC modules may utilize JTAG connections for FPGA
programming or other module debug activities. Individual JTAG connections
are available for each site through the use of a Molex 78171-5006 6-pin micro
connector. J8 is used for connection to the Lower Site, while J9 is used for
connection to the Upper Site.
Adapter cables to connect between J8/J9 and a Xilinx USB programmer are
available. Please consult factory for more information.
VREF voltage on the connector can be selected as either 2.5V or 3.3V using
switch
