PPC8567CVTAQGGA datasheet(61/139 Pages) FREESCALE

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MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

High-Speed Serial Interfaces (HSSI)

Figure 38 shows the PCI output AC timing conditions.

Figure 38. PCI Output AC Timing Measurement Condition

13 High-Speed Serial Interfaces (HSSI)

The MPC8568E features one Serializer/Deserializer (SerDes) interfaces to be used for high-speed serial

interconnect applications. It 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 39 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 (SD_TX and SD_TX) or a receiver

input (SD_RX and SD_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 SD_TX, SD_TX, SD_RX and SD_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: VSD_TX – VSD_TX. The VOD value can be either positive

or negative.

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

CLK

Output Delay

tPCKHOV

High-Impedance

tPCKHOZ

Output

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