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Notes
PES4T4 User Manual
®
Introduction
This user manual includes hardware and software information on the 89HPES4T4, a member of IDT's
PRECISE™ family of PCI Express® switching solutions offering the next-generation I/O interconnect stan-
dard.
Finding Additional Information
Information not included in this manual such as mechanicals, package pin-outs, and electrical character-
istics can be found in the data sheet for this device, which is available from the IDT website (www.idt.com)
as well as through your local IDT sales representative.
Content Summary
Chapter 1, "PES4T4 Device Overview," provides a complete introduction to the performance capabili-
ties of the 89HPES4T4. Included in this chapter is a summary of features for the device as well as a system
block diagram and pin description.
Chapter 2, "Clocking, Reset, and Initialization," provides a description of the two differential refer-
ence clock inputs that are used internally to generate all of the clocks required by the internal switch logic
and the SerDes.
Chapter 3, "Theory of Operation," describes the operation of the link feature including polarity inver-
sion, link width negotiation, and lane reversal.
Chapter 4, "Link Operation," describes the operation of the link feature including polarity inversion,
link width negotiation, and lane reversal.
Chapter 5, "General Purpose I/O," describes how the 16 General Purpose I/O (GPIO) pins may be
individually configured as general purpose inputs, general purpose outputs, or alternate functions.
Chapter 6, "SMBus Interfaces," describes the operation of the SMBus master interface on the
PES4T4.
Chapter 7, "Power Management," describes the power management capability structure located in the
configuration space of each PCI-PCI bridge in the PES4T4.
Chapter 8, "Hot-Plug and Hot-Swap," describes the behavior of the hot-plug and hot-swap features in
the PES4T4.
Chapter 9, "Configuration Registers," discusses the base addresses, PCI configuration space, and
registers associated with the PES4T4.
Chapter 10, "JTAG Boundary Scan," discusses an enhanced JTAG interface, including a system logic
TAP controller, signal definitions, a test data register, an instruction register, and usage considerations.
Signal Nomenclature
To avoid confusion when dealing with a mixture of "active-low" and "active-high" signals, the terms
assertion and negation are used. The term assert or assertion is used to indicate that a signal is active or
true, independent of whether that level is represented by a high or low voltage. The term negate or negation
is used to indicate that a signal is inactive or false.
To define the active polarity of a signal, a suffix will be used. Signals ending with an 'N' should be inter-
preted as being active, or asserted, when at a logic zero (low) level. All other signals (including clocks,
buses and select lines) will be interpreted as being active, or asserted when at a logic one (high) level.
About this Manual
1 - 1
February 1, 2011
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