MPC8540CPX667JC datasheet(65/104 Pages) FREESCALE

65 / 104 page

MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

RapidIO

Figure 41 shows the definitions of the data to clock static skew parameter tSKEW,PAIR and the data valid

window parameter DV. The data and frame bits are those that are associated with the clock. The figure

applies for all zero-crossings of the clock. All of the signals are differential signals. VD represents VOD for

the transmitter and VID for the receiver. The center of the eye is defined as the midpoint of the region in

which the magnitude of the signal voltage is greater than or equal to the minimum DV voltage.

Figure 41. Data to Clock Skew

Figure 42 shows the definition of the data to data static skew parameter tDPAIR and how the skew

parameters are applied.

Figure 42. Static Skew Diagram

VD Clock x

tSKEW,PAIR

1.0 UI Nominal

0.5 UI

0.5 DV

Eye Opening

VHDmim

VD = 0 V

VD Clock x

D[0:7]/D[8:15], FRAME

CLK0 (CLK1)

1.0 UI Nominal

0.5 UI

tDPAIR

tSKEW,PAIR

Center Point for Clock

D[0:7]/D[8:15], FRAME

Center point of the

data valid window of

the latest allowed data

bit for data grouped

late with respect

to clock

Center point of the

data valid window of

the earliest allowed data

bit for data grouped

late with respect

to clock

MPC8540CPX667JC データシート(PDF) 65 Page - Freescale Semiconductor, Inc

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