IDT 89EBPES24T3G2, Manual

Page: 9 / 35

Notes
EB24T3G2 Eval Board Manual 1 - 1 January 21, 2008
®
Chapter 1
Description of the EB24T3G2
Eval Board
Introduction
The 89HPES24T3G2 switch (also referred to as PES24T3G2 in this manual) is a member of IDT’s PCI
Express® standard based line of products. It is a PCIe® Base Specification 2.0 compliant (Gen2) 3-port
switch, with 8 serial lanes per port. One x8 upstream port is provided for connecting to the root complex
(RC), and two x8 downstream ports are available for connecting to PCIe endpoints or to another switch.
More information on this device can be found in the 89HPES24T3G2 User Manual.
The 89EBPES24T3G2 Evaluation Board (also referred to as EB24T3G2 in this manual) provides an
evaluation platform for the PES24T3G2 switch. It is also a cost effective way to add PCIe ports (slots) to an
existing system with limited number of PCIe ports/slots. The EB24T3G2 board is designed to function as an
add-on card to be plugged into a x8 PCIe slot available on a motherboard hosting an appropriate root
complex and microprocessor(s). The EB24T3G2 is a vehicle to test and evaluate the functionality of the
PES24T3G2 switch. Customers can use this board to get a headstart on software development prior to the
arrival of their own hardware. The EB24T3G2 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 EB24T3G2 board.
Figure 1.1 Function Block Diagram of the EB24T3G2 Eval Board
JTAG
Header
Main
Reset
I/O Expander
PCA9555
PCIe x8 Upstream Edge
EEPROM
24LC512
SMBUS
HEADER
PES24T3G2
PCI Express
Switch
External Power
PCIe x8 Downstream Slot
x8
25 MHz Crystal
Clock
Generator
Clock
Fanout
SMBus
PCIe x8 Downstream Slot
Voltages on board
+12V, +3.3V, +2.5V, +1.0V
Connector
Power
Module
PTH08T240
x8
x8
Port 4
Port 2
Port 0
(lane reversed)