Artesyn MVME8100/MVME8110 Installation and Use (September 2014) - Manual (Page 79)

Functional Description
MVME8100 / MVME8110 Installation and Use (6806800P25G) 79
The four ports can be configured for RS-232 or RS-422/RS-485 modes. RS-232 mode supports RX, TX, RTS
and CTS signals. Only four wire full duplex RX/TX is supported in RS422/485 mode. The signaling mode is
selected through on board configuration switches on S2.
4.12 PCIe Ports
The MVME8100 / MVME8110 provides multiple PCI Express ports. The P5020/P5010 is configured to use
two x4 PCIe controllers (#1 and #3) on the MVME8100 / MVME8110. Both controllers are configured to
operate at Gen 1 data rate (2.5 Gbaud). These ports are routed to an IDT 32NT24AG2 PCIe switch for
expansion of the PCIe ports. The IDT switch is a 32 lane Gen 2 device and can support up to 24 ports, 8 of
which are capable of NT function. Each port of the switch is configured to operate at Gen 1 data rate. The
configuration of the ports and the partitioning of the switch into a single or multiple domains is controlled
by an I2C eeprom connected to the PCIe switch master SMbus and loaded into the switch following reset.
The board provides two separate eeproms so that separate configuration data can be maintained for the
MVME8100 / MVME8110 operating as a root complex or as an end point on the P0 connector ports for
MVME8100. The selection of the root complex or end point eeprom for loading the configuration data after
reset is determined by the root complex configuration switch S4-2 (see
S4 Switch on page 40 .). The eeproms
can be reprogrammed from the processor using the I2C master interface in the IDT device. A swap bit in
CPLD control register can be used to temporarily swap the eeprom device addressing so that the alternate
eeprom can be reprogrammed. A diagram of the PCIe port configuration is shown in the figure below.