MPC8560CPXAPDB datasheet(62/108 Pages) FREESCALE

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MPC8560 Integrated Processor Hardware Specifications, Rev. 3.1

Freescale Semiconductor

RapidIO

Figure 41 shows the DC driver signal levels.

Figure 41. DC Driver Signal Levels

13.2 RapidIO AC Electrical Specifications

This section contains the AC electrical specifications for a RapidIO 8/16 LP-LVDS device. The interface defined is

a parallel differential low-power high-speed signal interface. Note that the source of the transmit clock on the

RapidIO interface is dependent on the settings of the LGPL[0:1] signals at reset. Note that the default setting makes

the core complex bus (CCB) clock the source of the transmit clock. See Chapter 4 of the Reference Manual for more

details on reset configuration settings.

13.3 RapidIO Concepts and Definitions

This section specifies signals using differential voltages. Figure 42 shows how the signals are defined. The figure

shows waveforms for either a transmitter output (TD and TD) or a receiver input (RD and RD). Each signal swings

between A volts and B volts where A > B. Using these waveforms, the definitions are as follows:

•

The transmitter output and receiver input signals TD, TD, RD, and RD each have a peak-to-peak swing of

A-B volts.

•

The differential output signal of the transmitter, VOD, is defined as VTD – VTD.

•

The differential input signal of the receiver, VID, is defined as VRD – VRD.

•

The differential output signal of the transmitter or input signal of the receiver, ranges from A – B volts to –

(A – B) volts.

•

The peak differential signal of the transmitter output or receiver input, is A – B volts.

•

The peak-to-peak differential signal of the transmitter output or receiver input, is 2

× (A – B) volts.

VOA

VOB

RTERM

100

Ω

(no m)

VVOD = VOA – VOB

∆VOS

VOHCM

VOLCM

VOSCM = (VOA + VOB)/2

–V +

∆VOD

VOD = VOA – VOB

–V –

∆VOD

–V

1.375 V

1.125 V

454 mV

247 mV

–247 mV

–454 mV

VOLD

Common-Mode Specifications

(c)

Differential Specifications

(b)

(a)

Note: VOA refers to voltage at output A; VOB refers to voltage at output B.

VOHD

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