User`s manual

Adapter Card Interfaces
16
Rev 1.3
Mellanox Technologies
4.3.1 System Memory
Each of the HCA cards utilizes the PCI Express interface to store and access IB fabric connection information and
packet data on the system memory.
4.3.2 Flash
Each of the HCA cards includes one 2MB SPI Flash device (M25P80 device by ST Microelectronics) accessible via
the Flash interface of the MT25408 ConnectX IB device.
There is a jumper on each adapter card that indicates to the device whether an on-board Flash device is to be used.
Table 7 provides information on this jumper. See Figure 8 on page 19 for the jumper location.
4.3.3 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.
4.4 VPD Layout for DDR/QDR Single and Dual Port HCA Cards
The PCI VPD (Vital Product Data) layout, for each of the described Mellanox Technologies ConnectX IB HCA
adapter cards, complies with the format defined in the PCI 2.3 Specification, Appendix I. All ConnectX IB HCA
adapter cards share the same PCI VPD layout.“A1” was used as the HCA card (PCB) revision. Later revisions of the
HCA card will have the same format.
Table 7 - Jumper Configuration
Description Option
Card Default
Configuration
Comments
Flash present/ not present connection open – Flash present
connection shorted – Flash not present
Figure 7:
Flash Jumper
connection open
– Flash present
Header 1x2
Table 8 - VPD Layout for MHRH[12]9-X[ST]C
Offset (Decimal) Item Value Format Description
0 Large Resource Type ID String Tag
(0x02)
0x82
1 Length [7:0] LSB 0xD
2 Length [15:8] MSB 0x0
3 Data FALCON IB QDR STR
16 Large Resource Type VPD-R Tag
(0x10)
0x90
17 Length [7:0] LSB 0x4F
18 Length [15:8] MSB 0x00