Motorola MVME3100 manual PCI-X-to-PCI-X Bridges, PCI Mezzanine Card Slots

Chapter 4 Functional Description

PCI-X-to-PCI-X Bridges

The MVME3100 uses two PLX PCI6520 PCI-X-to-PCI-X bridges to isolate the primary PCI bus, bus A. These bridges isolate bus A from bus B with the PMC sites and from bus C with the USB controller and PMCspan interface. The PCI6520 is a 64-bit, 133 MHz, PCI-X r1.0b compliant device. It operates asynchronously between 33 MHz and 133 MHz on either primary or secondary port. Refer to the PCI6520CB Data Book listed in Appendix B, Related Documentation, for additional details and/or programming information.

PCI Mezzanine Card Slots

The MVME3100 provides two PMC sites that support standard PMCs or PrPMCs. Both PMC sites are located on PCI bus B and operate at the same speed and mode as determined by the slowest PMC module. The board routing supports a maximum of 100 MHz PCI-X operation on each site. Signaling voltage (Vio) for the two PMC sites is dependent on keying pin installation options and can be configured for 5V or 3.3V. Both sites must be configured for the same Vio voltage or the Vio voltage will be disabled. Each PMC site has enough 3.3V and 5V power allocated to support a 25 watt (max) PMC or PrPMC from either supply.

PMC slot 1 supports:

Mezzanine Type:	PMC = PCI Mezzanine Card
Mezzanine Size:	S1B = Single width and standard depth
	(75mm x 150mm) with front panel
PMC Connectors:	J11, J12, J13, and J14 (32/64-bit PCI with front and
	rear I/O)
Signaling Voltage:	VIO = +3.3V (+5V tolerant) or +5V, selected by keying
	pin

PMC slot 2 supports:

Mezzanine Type:	PMC = PCI Mezzanine Card
Mezzanine Size:	S1B = Single width and standard depth
	(75mm x 150mm) with front panel
PMC Connectors:	J21, J22, and J23 (32/64-bit PCI with front I/O)
Signalling Voltage:	VIO = +3.3V (+5V tolerant) or +5V, selected by keying
	pin

Note You cannot use 3.3V and 5V PMCs together; the voltage keying pin on slots 1 and 2 must be identical. When in 5V mode, the bus runs at 33 MHz.

In addition, the PMC connectors are located such that a double-width PMC may be installed in place of the two single-width PMCs.

MVME3100 Installation and Use (V3100A/IH1) 43