MPC8535E datasheet(90/126 Pages) FREESCALE

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MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3

High-Speed Serial Interfaces

Freescale Semiconductor

Figure 56 shows the PCI output AC timing conditions.

Figure 56. PCI Output AC Timing Measurement Condition

2.20

High-Speed Serial Interfaces

The MPC8535E 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 SGMII or SATA.

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.

2.20.1

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 57 shows how the signals are defined. For illustration purposes, 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.

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.

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.

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

The Differential Input Voltage (or Swing) of the receiver, VID, is defined as the difference of the two complimentary input

voltages: VSDn_RX - VSDn_RX. The VID value can be either positive or negative.

Differential Peak Voltage, VDIFFp

The peak value of the differential transmitter output signal or the differential receiver input signal is defined as Differential Peak

Voltage, VDIFFp = |A - B| Volts.

Differential Peak-to-Peak, VDIFFp-p

Since the differential output signal of the transmitter and the differential input signal of the receiver each range from A - B to

-(A - B) Volts, the peak-to-peak value of the differential transmitter output signal or the differential

receiver input signal is defined as Differential Peak-to-Peak Voltage, VDIFFp-p = 2*VDIFFp =

2 * |(A - B)| Volts, which is twice of differential swing in amplitude, or twice of the differential

CLK

Output Delay

tPCKHOV

High-Impedance

tPCKHOZ

Output

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