MPC8640DEC datasheet(78/140 Pages) FREESCALE

78 / 140 page

MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Serial RapidIO

Figure 52. Compliance Test/Measurement Load

15 Serial RapidIO

This section describes the DC and AC electrical specifications for the RapidIO interface of the MPC8640,

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

Two transmitter types (short run and long run) on 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 will accept signals

from both the short run and long run transmitter specifications.

The short run transmitter specifications 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 will be 200 ppm.

To ensure interoperability between drivers and receivers of different vendors and technologies, AC

coupling at the receiver input must be used.

15.1

DC Requirements for Serial RapidIO SD

n_REF_CLK and

n_REF_CLK

For more information, see Section 13.2, “SerDes Reference Clocks.”

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