Mellanox Technologies ConnectX-3 MCX341A-XCAN, User Manual

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ConnectX®-3 Ethernet Single and Dual SFP+ Ports Mezzanine Card User Manual for Open Compute Project Rev 1.9
Mellanox Technologies 15
2.3.1 System Memory
The Mezzanine cards utilize the PCI Express interface to store and access Ethernet fabric con-
nection information and packet data on the system memory.
2.3.2 SPI
Each of the Mezzanine cards includes one 16MB SPI Flash device (M25PX16-VMN6P device
by ST Microelectronics) accessible via the SPI interface of the ConnectX®-3 EN device.
There is a jumper on each Mezzanine card that indicates to the device whether an on-board Flash
device is to be used or not.
Table 4 provides information on this jumper.
2.3.3 EEPROM
Each board incorporates an EEPROM that is accessible through the I
2
C-compatible interface.
The EEPROM capacity is 4Kb. The EEPROM is used for storing the Vital Product Data (VPD).
The PCI VPD (Vital Product Data) layout for each of the Mezzanine cards complies with the for-
mat defined in the
PCI 3.0 Specification, Appendix I.
Table 4 - Jumper Configuration
Description Option
Card Default
Configuration
Flash present/
not present
connection open – Flash present
connection shorted – Flash not present connection open
– Flash present
Table 5 - MCX342A-XCAN VPD Layout
Offset
(Decimal)
Item Value Format Description
0 Large Resource Type ID
String Tag (0x02)
0x82
1 Length [7:0] LSB 0x18
2 Length [15:8] MSB 0x0
3 Data CX354A - Con-
nectX-3 QSFP
STR
27 Large Resource Type VPD-R
Tag (0x10)
0x90
28 Length [7:0] LSB 0x4F
29 Length [15:8] MSB 0x00
30 VPD Keyword PN STR Add in Card Part Number
32 Length 0x15
33 Part Number PN %STR_SPC