IDT EB4T4 Eval Board, Manual

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Notes
EB4T4 Eval Board Manual 2 - 1 August 20, 2007
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Chapter 2
Installation of the EB4T4
Eval Board
EB4T4 Installation
This chapter discusses the steps required to configure and install the EB4T4 evaluation board. All avail-
able DIP switches and jumper configurations are explained in detail.
The primary installation steps are:
1. Configure jumper/switch options suitable for the evaluation or application requirements.
2. Connect PCI Express endpoint cards to the downstream port PCIe slots on the evaluation board.
3. Insert the evaluation board into the host system (motherboard with root complex chipset).
4. Apply power to the host system.
The EB4T4 board is shipped with all jumpers and switches configured to their default settings. In most
cases, the board does not require further modification or setup.
Hardware Description
The PES4T4 is an 4-lane, 4-port PCI Express® switch. It is a peripheral chip that performs PCI Express
based switching with a feature set optimized for high performance applications such as servers and
storage. It provides fan-out and switching functions between a PCI Express upstream port and three down-
stream ports or peer-to-peer switching between downstream ports.
The EB4T4 has three PCI Express downstream ports, accessible through three x4 open-ended connec-
tors.
Basic requirements for the board to run are:
– Host system with a PCI Express root complex supporting x4 configuration through a PCI Express
x1 slot.
– PCI Express Endpoint Cards capable of training x1 link.
Host System
The evaluation board cannot be operated as a standalone unit. A host system implementing a PCI
Express root complex supporting x1 configuration through a PCI Express x1 slot is required to take full
advantage of the PES4T4’s capabilities.
Reference Clocks
The PES4T4 uses one differential reference clock (100 MHz). The EB4T4 derives this clock from a
common source which is user-selectable. The common source can be either the host system’s reference
clock or the onboard clock generator. Selection is made by resistors described in Table 2.1.
Clock Configuration R32, R53, R51, R62
Installed Clock Source
R32, R53 Onboard Reference Clock – Use onboard clock generator
R51, R62 Upstream Reference Clock – Host system provides clock (Default)
Table 2.1 Clock Source Selection