MPC8544E datasheet(63/117 Pages) FREESCALE

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MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5

Freescale Semiconductor

High-Speed Serial Interfaces (HSSI)

Figure 42 shows the PCI input AC timing conditions.

Figure 42. PCI Input AC Timing Measurement Conditions

Figure 43 shows the PCI output AC timing conditions.

Figure 43. PCI Output AC Timing Measurement Condition

16 High-Speed Serial Interfaces (HSSI)

The MPC8544E features two serializer/deserializer (SerDes) interfaces to be used for high-speed serial

interconnect applications.The SerDes1 dedicated for PCI Express data transfers. The SerDes2 can be used

for PCI Express and/or SGMII application. 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.

16.1

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 44 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.

tPCIVKH

CLK

Input

tPCIXKH

CLK

Output Delay

tPCKHOV

High-Impedance

tPCKHOZ

Output

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