IDT 89EBPES16T4G2, Manual

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Notes
EB16T4G2 Eval Board Manual 1 - 1 October 3, 2007
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Chapter 1
Description of the EB16T4G2
Eval Board
Introduction
The 89HPES16T4G2 switch (also referred to as PES16T4G2 in this manual) is a member of IDT’s PCI
Express® standard (PCIe®) based line of products. It is a Gen2 4-port switch, with 4 serial lanes per port.
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 89HPES16T4G2 User Manual.
The 89EBPES16T4G2 Evaluation Board (also referred to as EB16T4G2 in this manual) provides an
evaluation platform for the PES16T4G2 switch. It is also a cost effective way to add a PCIe downstream
port (x4) to an existing system with a limited number of PCIe downstream ports. The EB16T4G2 eval board
is designed to function as an add-on card to be plugged into a x4 PCIe slot available on a motherboard
hosting an appropriate root complex, microprocessor(s), and three downstream ports. The EB16T4G2 is a
vehicle to test and evaluate the functionality of the PES16T4G2 chip. Customers can use this board to get a
headstart on software development prior to the arrival of their own hardware. The EB16T4G2 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 EB16T4G2 board.
Figure 1.1 Function Block Diagram of the EB16T4G2 Eval Board
JTAG
Header
Main
Reset
I/O Expander
PCA9555
PCIe x4 Upstream Edge
EEPROM
24LC512
SMBUS
HEADER
PES16T4G2
PCI Express
Switch
External Power
PCIe x16 Downstream Slot
PCIe x16 Downstream Slot
x4
25 MHz
SSC Clock
Buffer
Clock
Fanout
SMBus
PCIe x16 Downstream Slot
Voltages on board
+12V, +3.3V, +2.5V, +1.0V
Connector
Power
Module
PTH08T240
x4
x4
x4