Technical data

Functional Description

MVME2502 Installation and Use (6806800R96B)

PMC/XMC sites are keyed for 3.3V PMC signaling. PMC and XMC add-on cards must have a hole

in the 3.3 V PMC keying position in order to be populated on the MVME2502. The XMC

specification accommodates this since it is expected that carrier cards will host both XMC and

PMC capable add-on cards.

The MVME2502 have a keying pin at the 3.3V location at each PMC site. The MVME2502 boards

are not 5 volt PMC IO compatible. The MVME2502 also has a 5 volt keying pin location at each

PMC site. At PMC site 2, the 5 volt keying pin hole is used to mount the SATA adapter card.

Warning label covers 5 volt keying pin at PMC site 1 and also at PMC site 2. If 5 volt PMC or XMC

devices are operated on MVME2502 it may cause damage to the board.

The MVME2502 utilizes the P2020 x2 link PCI Express interface for PMC/XMC1 and x1 link PCI

Express interface for PMC/XMC2. It is designed such that same PCI Express interface is used for

either PMC or XMC. It is made possible by using PCIe Mux/DeMux chip. The CPLD via on-board

switch controls the enable pin.

The CPLD controls the PCIe Mux/DeMux at both sites. The CPLD detects the presence signal

provided by the XMC or PMC board and it will be used to configure the routing of PCIe

Mux/DeMux correspondingly.

4.9.1 PMC Add-on Card

The MVME2502 PMC interface utilizes IDT’s TSI384 as the PCie/PCI-X bridge. It can support up

to 8.5 Gbps (64 bits x 133 Mhz). The onboard switch S2-5 configures the TSI384 to run on

either 100 Mhz or 133 Mhz, with 133 Mhz as default.

The MVME2502 supports multi-function PMCs and processor PMCs (PrPMCs). The PMC site

has two IDSELs, two REQ/GNT pairs, and EREADY to support PrPMC as defined by VITA39.

4.9.2 XMC Add-on Card

The x2 links the PCI-E Gen 1 and is directly routed to the P15 XM connector through Pericom

MUX Switch. The onboard switch S2-4 should be set to "ON".

XMC add-on cards are required to operate at +5V or +12V (from carrier to XMC). The

MVME2502 provides +5V to the XMC VPWR (Variable Power) pins. The MVME2502 does not

provide +12V to the XMC VPWR pins. Voltage tolerances for VPWR and all carrier supplied

voltage (+3.3 V, +12 V, -12 V) are defined by the base XMC standard.