Intel Entry Redundant Power 2U ERP2U User Manual
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SSI
ERP2U Power Supply Design Guide, V1.0
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8.3 SMBus Communication
STATUS
Optional
There may be SMBus communication to the power assembly to monitor the cage and modules. This would
require a serial EEPROM to store FRU data of each module and communicate the information onto the SMBus.
There may also be a device in the cage to monitor the module failure and presence status via the SMBus. If there
is a fan in the cage, the SMBus device in the cage may also monitor the fan(s) for failure.
8.3.1
Field Replacement Unit (FRU) Signals
STATUS
Optional
Two pins will be allocated for the FRU information on the power supply connector. One pin is the Serial Clock
(SCL). The second pin is used for Serial Data (SDA). Both pins are bi-directional and are used to form a serial
bus. The FRU circuits inside the power supply must be powered off of 5 VSB output and grounded to ReturnS
(remote sense return). The Write Control (or Write protect) pin should be tied to ReturnS inside the power supply
so that information can be written to the EEPROM.
8.3.2
Module FRU Data
FRU data shall be stored starting in address location 8000h through 80FFh. The FRU data format shall be
compliant with the IPMI specifications. The current version of these specifications are available at:
http:\\developer.intel.com/design/servers/ipmi/spec.htm.
8.3.3
Module FRU Data Format
The information to be contained in the FRU device is shown in the following table.
Table 25: FRU Device Information
Area Type
Description
Common Header
As defined by the FRU document
Internal Use Area
Not required, do not reserve
Chassis Info Area
Not applicable, do not reserve
Board Info Area
Not applicable, do not reserve
8.3.3.1 Product Info Area
As defined by the IPMI FRU document. Product information shall be defined as follows:
Table 26: FRU Device Product Information Area
Field Name
Field Description
Manufacturer Name
{Formal name of manufacturer}
Product Name
{Manufacturer’s model number}
Product part/model number
Customer part number
Product Version
Customer current revision
Product Serial Number
{Defined at time of manufacture}