Intel
®
Carrier Grade Server TIGPT1U TPS
NEBS 3.3 V Riser Board
Revision 1.0
47
6. NEBS 3.3 V Riser Board
This chapter describes the design and external interface of the Intel
®
TIGPT1U NEBS 3.3 V riser
board. Features of the NEBS 3.3 V riser board include:
•
One 66 MHz 3.3 V 64-bit PCI slot
•
A 1 x 3 power connector to provide 5V power to support one Peripheral Component
Interconnect (PCI) adapter with a maximum power requirement of 25 watts (5 V @ 5 A).
Note that the 5 V power rail is only connected to the 1 x 3 power connector. 5 V supply
connections from the baseboard are disconnected at the riser connector.
6.1 Chapter Structure and Outline
The information contained in this chapter is organized into four sections. The information is
presented in a modular format, with numbered headings for each major topic and subtopic. The
content of each section is summarized as follows:
Section 6.2: Functional Description:
Provides a functional description of the NEBS 3.3 V riser board.
Section 6.3: Connector Interface:
Gives signal descriptions and the corresponding electrical parameters for
each input and output of a given connector.
Section 6.4: Electrical Specification:
Describes the electrical, environmental, and mechanical specifications.
6.2 Functional
Description
The NEBS 3.3 V riser board contains one 66 MHz 3.3 V 64-bit slot. A 1 x 3 power connector is
used to provide 5 V power to the PCI adapter plugged into the NEBS 3.3 V riser board, and is
capable of supporting a PCI adapter with a maximum wattage of 25 watts (5 V @ 5 A).
The riser is intended to mate to slot 1 of the Baseboard. The riser can accept 5 V from either
the baseboard edge fingers or through the connector cable assembly from the XFPB. Selecting
between the two supplies are done as follows:
1. To select P5V_A from the XFPB -- Install cable from the PDB to J1A1 and depopulate
RP7A1, RP7A2, RP7A3 (default state).
2. To select P5V from baseboard -- Install RP7A1, RP7A2, RP7A3 and remove cable from
the PDB.
