Chapter 4 Functional Description
PCI/PCI-X Interfaces and Devices
The MVME3100 provides three separate PCI/PCI-X bus segments. Bus segment A operates in 66 MHz PCI or PCI-X mode and is connected to the MPC8540, the TSi148 VME controller, the serial ATA (sATA) controller, and two PCI-X-to-PCI-X bridges. Bus segment B is bridged between bus A and the two PMC sites and operates in 33/66 MHz PCI or 66/100 MHz PCI-X mode depending on the slowest speed PMC installed. Bus segment C is bridged between bus A, the USB controller, and the PMCspan connector. Bus C operates at 33 MHz PCI mode.
MPC8540 PCI-X Interface
The MPC8540 PCI-X controller operates in PCI or PCI-X, host bridge mode depending on the state of the Bus A mode switch. The mode cannot be changed by software. Refer to the MPC8540 Reference Manual listed in Appendix B, Related Documentation, for additional details and/or programming information.
TSi148 VME Controller
The VMEbus interface for the MVME3100 is provided by the TSi148 ASIC. The TSi148 provides the required VME, VME extensions, and 2eSST functions. Transceivers are used to buffer the VME signals between the TSi148 and the VME backplane. Refer to the TSi148 User’s Manual listed in Appendix B, Related Documentation, for additional details and/or programming information.
Serial ATA Host Controller
The sATA host controller uses the Intel GD31244 PCI-X to sATA controller. This device provides four sATA channels at 1.5Gb/s and is compliant with the Serial ATA: High speed serialized AT Attachment Specification, Revision 1.0e. It also supports the native command queuing feature of sATA II.
The MVME3100 uses two of the four sATA channels. Channel 0 is routed to a sATA connector mounted on the front panel for an external drive connection. Channel 1 is routed to a planar sATA connector for an "inside the chassis" drive connection. Colocated with the planar connector is a sATA power connector. At power-up, the controller is configured to operate in either legacy (Native PCI IDE) mode or Direct Port Access (DPA) mode, controlled by the sATA mode switch. The mode cannot be changed by software.
The MVME3100 provides two LEDs to indicate sATA channel activity. The function of the LEDs depends on the operating mode of the 31244 (legacy or DPA mode).
Refer to the 31244 PCI-X to Serial ATA Controller Datasheet and 31244 PCI-X to Serial ATA Controller Specification Update listed in Appendix B, Related Documentation, for additional details and/or programming information
