MPC8572ECLPXAVND datasheet(90/140 Pages) FREESCALE

90 / 140 page

MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Serial RapidIO

16.5.1

Compliance Test and Measurement Load

The AC timing and voltage parameters must be verified at the measurement point, as specified within 0.2

inches of the package pins, into a test/measurement load shown in Figure 57.

NOTE

The allowance of the measurement point to be within 0.2 inches of the

package pins is meant to acknowledge that package/board routing may

benefit from D+ and D– not being exactly matched in length at the package

pin boundary.

Figure 57. Compliance Test/Measurement Load

17 Serial RapidIO

This section describes the DC and AC electrical specifications for the RapidIO interface of the MPC8572E

for the LP-Serial physical layer. The electrical specifications cover both single and multiple-lane links.

Two transmitters (short run and long run) and a single receiver are specified for each of three baud rates,

1.25, 2.50, and 3.125 GBaud.

Two transmitter specifications allow for solutions ranging from simple board-to-board interconnect to

driving two connectors across a backplane. A single receiver specification is given that accepts signals

from both the short run and long run transmitter specifications.

The short run transmitter should be used mainly for chip-to-chip connections on either the same printed

circuit board or across a single connector. This covers the case where connections are made to a mezzanine

(daughter) card. The minimum swings of the short run specification reduce the overall power used by the

transceivers.

The long run transmitter specifications use larger voltage swings that are capable of driving signals across

backplanes. This allows a user to drive signals across two connectors and a backplane. The specifications

allow a distance of at least 50 cm at all baud rates.

All unit intervals are specified with a tolerance of +/– 100 ppm. The worst case frequency difference

between any transmit and receive clock is 200 ppm.

MPC8572ECLPXAVND 数据表(PDF) 90 Page - Freescale Semiconductor, Inc