Dell PowerEdge M805 - Manual (Page 10)

8
Rev 1.0
4 Mezzanine Card Interfaces
The Mezzanine card attaches to the blade using a press feed connector which connects both the InfiniBand and PCI
Express interfaces.
4.1 InfiniBand Interface
The ConnectX
TM
IB (MT25408) device is compliant with the InfiniBand Architecture Specification, Release 1.2. It
has two compliant 4X InfiniBand ports, ports 1 and 2, each having four Tx/Rx pairs of SerDes. The mezzanine card
based on this device provides access to these ports through a board to board press feed connector.
4.2 PCI Express Interface
The MDI mezzanine card has eight Tx/Rx pairs of SerDes providing for a PCI Express x8 interface, version 2.0 com-
pliant and compatible with base 1.1 chipsets. The device can be either a master initiating the PCI Express bus opera-
tions or a slave responding to PCI bus operations.
4.3 Memory
The mezzanine card supports multiple memory devices through the PCI Express, Flash, and I2C-compatible inter-
faces.
4.3.1 System Memory
The mezzanine card utilizes the PCI Express interface to store and access IB fabric connection information on the
system memory.
4.3.2 Flash
The mezzanine card includes two 2MB SPI Flash devices (P/N M25P16-VME6G by ST Microelectronics) accessible
via the Flash interface of the MT25408 ConnectX IB device.
4.3.2.1 Jumper Configuration
There is a jumper on each mezzanine card that indicates to the device whether an on-board Flash device exists (or is
to be used). Table 6 provides information on this jumper. See Figure A.1 on page 15 for the jumper location.
4.3.3 VPD EEPROM
Each board incorporates an EEPROM that is accessible through the I2C-compatible interface. The EEPROM is used
for storing the Vital Product Data (VPD). The VPD format adheres to the PCI Local Bus specification rev 2.3 VPD
definition. The EEPROM capacity is 512 bytes.