MPC8640DEC datasheet(59/140 Pages) FREESCALE

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MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

High-Speed Serial Interfaces (HSSI)

Figure 37. I2C Bus AC Timing Diagram

13 High-Speed Serial Interfaces (HSSI)

The MPC8640D features two Serializer/Deserializer (SerDes) interfaces to be used for high-speed serial

interconnect applications. The SerDes1 interface is dedicated for PCI Express data transfers. The SerDes2

can be used for PCI Express and/or Serial RapidIO data transfers.

This section describes the common portion of SerDes DC electrical specifications, which is the DC

requirement for SerDes Reference Clocks. The SerDes data lane’s transmitter and receiver reference

circuits are also shown.

13.1

Signal Terms Definition

The SerDes utilizes differential signaling to transfer data across the serial link. This section defines terms

used in the description and specification of differential signals.

Figure 38 shows how the signals are defined. For illustration purpose, only one SerDes lane is used for

description. The figure shows waveform for either a transmitter output (SDn_TX and SDn_TX) or a

receiver input (SDn_RX and SDn_RX). Each signal swings between A Volts and B Volts where A > B.

Using this waveform, the definitions are as follows. To simplify illustration, the following definitions

assume that the SerDes transmitter and receiver operate in a fully symmetrical differential signaling

environment.

1. Single-Ended Swing

The transmitter output signals and the receiver input signals SDn_TX, SDn_TX, SDn_RX and

SDn_RX each have a peak-to-peak swing of A - B Volts. This is also referred as each signal wire’s

Single-Ended Swing.

2. Differential Output Voltage, VOD (or Differential Output Swing):

The Differential Output Voltage (or Swing) of the transmitter, VOD, is defined as the difference of

the two complimentary output voltages: VSDn_TX - VSDn_TX. The VOD value can be either positive

or negative.

3. Differential Input Voltage, VID (or Differential Input Swing):

SDA

SCL

tI2CF

tI2SXKL

tI2CL

tI2CH

tI2DXKL

tI2DVKH

tI2SXKL

tI2SVKH

tI2KHKL

tI2PVKH

tI2CR

tI2CF

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