Emerson MVME55006E manual System Memory, PCI Local Buses and Devices, Gigabit Ethernet Interface

Functional Description System Memory

2.8System Memory

System memory for the MVME5500 is provided by one to four banks of ECC synchronous DRAM in two banks. During system initialization, the firmware determines the presence and configuration of each memory bank installed by reading the contents of the serial presence detection (SPD) EEPROM on the board, and another one on the expansion memory module. The system firmware then initializes the GT-64260B memory controller for proper operation based on the contents of the serial presence detection EEPROM.

If a PMC module is plugged into PMC slot 1, the memory mezzanine card cannot be used because the PMC module covers the memory mezzanine connector.

2.9PCI Local Buses and Devices

The GT-64260B on the MVME5500 provides two independent 64-bit, 33/66 MHz PCI buses. The GT-64260B documentation refers to these buses as PCI Bus 0 and PCI Bus 1.

The devices on Bus 1 are the GT-64260B PCI bridge 1, one 32/64-bit PMC slot, and an 825544EI LAN device. The devices on Bus 0 are the GT-64260B PCI bridge 0, one 32/64-bit PMC slot and a HiNT PCI 6154 PCI-to-PCI bridge. For the purpose of this document, Bus 1 is also identified as PCI Bus 1.0, and Bus 0 is also identified as PCI Bus 0.0.

2.9.1Gigabit Ethernet Interface

The MVME5500 provides a Gigabit Ethernet transceiver interface (1000BaseT) using an Intel 82544EI integrated Ethernet device (Ethernet 1). It also supports 100BaseTX and 10BaseT modes of operation. The Ethernet interface is accessed via an industry-standard, front-panel mounted RJ-45 connector.

2.9.210/100Mb Ethernet Interface

The 10/100Mb Ethernet interface (Ethernet 2) comes from the GT-64260B, and connects to an external PHY. This port can be routed to a front-panel RJ-45 connector or to the P2 connector with user-configurable jumpers.

Each Ethernet interface is assigned an Ethernet Station Address. The address is unique for each device. The Ethernet Station Address is displayed on a label affixed to the board. The assembly policy is to assign MAC addresses in such a manner that the higher value MAC address is assigned to Ethernet port 1 and the lower to Ethernet port 2.

In addition, the Gigabit Ethernet address is stored in a configuration ROM interfaced to the 82544EI device, while the 10/100Mb Ethernet address is stored in the on-board VPD serial

EEPROM.

42 MVME55006E Single-Board Computer Installation and Use (6806800A37D)