IDT EB4T4 Eval Board, Manual

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Notes
EB4T4 Eval Board Manual 1 - 1 August 20, 2007
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Chapter 1
Description of the EB4T4
Eval Board
Introduction
The 89HPES4T4 switch (also referred to as PES4T4 in this manual) is a member of IDT’s PCI Express®
standard (PCIe®) based line of products. It is an 4-lane, 4-port switch. One upstream port is provided for
connecting to the root complex (RC), and up to three downstream ports are available for connecting to PCIe
endpoints or to another switch. More information on this device can be found in the 89HPES4T4 User
Manual.
The 89EBPES4T4 Evaluation Board (also referred to as EB4T4 in this manual) provides an evaluation
platform for the PES4T4 switch. It is also a cost effective way to add a PCIe downstream port (x1) to an
existing system with a limited number of PCIe downstream ports. The EB4T4 eval board is designed to
function as an add-on card to be plugged into a x1 PCIe slot available on a motherboard hosting an appro-
priate root complex, microprocessor(s), and three downstream ports. The EB4T4 is a vehicle to test and
evaluate the functionality of the PES4T4 chip. Customers can use this board to get a headstart on software
development prior to the arrival of their own hardware. The EB4T4 is also used by IDT to reproduce
system-level hardware or software issues reported by customers. Figure 1.1 illustrates the functional block
diagram representing the main parts of the EB4T4 board.
Figure 1.1 Function Block Diagram of the EB4T4 Eval Board
JTAG
Header
Main
Reset
I/O Expander
PCA9555
PCIe x1 Upstream Edge
EEPROM
24LC512
SMBUS
HEADER
PES4T4
PCI Express
Switch
External Power
PCIe x1 Downstream Slot
x1
x1
25 MHz
SSC Clock
Buffer
Clock
Fanout
SMBus
Voltages on board
+12V, +3.3V, +1.5V, +1.0V
Connector
Power
Module
PTH08T240
x1
x1
x1
PCIe x1 Downstream Slot
PCIe x1 Downstream Slot