MPC8540CPX667JC 参数 Datasheet PDF下载

RapidIO

shows the definitions of the data to clock static skew parameter t

SKEW,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. V

D

represents V

OD

for

the transmitter and V

ID

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.

V

D

Clock x

1.0 UI Nominal

0.5 UI

V

D

Clock x

t

SKEW,PAIR

0.5 DV

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

0.5 DV

V

HDmim

V

HDmim

V

D

= 0 V

V

D

= 0 V

Eye Opening

DV

Figure 41. Data to Clock Skew

shows the definition of the data to data static skew parameter t

DPAIR

and how the skew

parameters are applied.

Center Point for Clock

CLK0 (CLK1)

1.0 UI Nominal

0.5 UI

Center point of the

data valid window of

the earliest allowed data

bit for data grouped

late with respect

to 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

t

DPAIR

t

SKEW,PAIR

Figure 42. Static Skew Diagram

MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

65