MPC8379ECVRALDA datasheet(67/114 Pages) FREESCALE

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MPC8379E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

High-Speed Serial Interfaces (HSSI)

Figure 46 shows the SPI timing in slave mode (external clock).

Figure 46. SPI AC Timing in Slave Mode (External Clock) Diagram

Figure 47 shows the SPI timing in master mode (internal clock).

Figure 47. SPI AC Timing in Master Mode (Internal Clock) Diagram

20 High-Speed Serial Interfaces (HSSI)

The MPC8379E features two serializer/deserializer (SerDes) interfaces to be used for high-speed serial

interconnect applications. See Table 1 for the interfaces supported.

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.

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 48 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.

SPICLK (input)

tNEIXKH

tNEIVKH

tNEKHOV

Input Signals:

SPIMOSI

(See Note)

Output Signals:

SPIMISO

(See Note)

Note: The clock edge is selectable on SPI.

SPICLK (output)

tNIIXKH

tNIKHOV

Input Signals:

SPIMISO

(See Note)

Output Signals:

SPIMOSI

(See Note)

Note: The clock edge is selectable on SPI.

tNIIVKH

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