80KSBR200 Datasheet, PDF (123/172 Pages) Integrated Device Technology – sRIO SERIAL BUFFER FLOW-CONTROL DEVICE

IDT 80KSBR200
Notes
13.0 Serial RapidIO^TM AC Specifications
Advanced Datasheet*
13.1 Overview
The SerB’s SERDES are in full compliance to the RapidIO^TM AC specifications for the LP-Serial physical layer [5]. This
section provides those specifications for reference. 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 chip-to-chip 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 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 SerB can drive beyond the specification
distance of at least 50 cm at all baud rates. Please use IDT’s Simulation Kit IO models to determine reach and signal
quality for a given PCB design.
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 inter-operability between drivers and receivers of different vendors and technologies, AC coupling at the
receiver input must be used.
13.2 Signal Definitions
LP-Serial links uses differential signaling. This section defines terms used in the description and specification of differ-
ential signals. Differential Peak-Peak Voltage of Transmitter or Receiver shows how the signals are defined. The figure
below 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:
1. The transmitter output signals and the receiver input signals TD,TD, RD and RD each have a peak-to-peak
swing of A - B Volts
2. The differential output signal of the transmitter, V_OD, is defined as V_TD-V_TD.
3. The differential input signal of the receiver, V_ID, is defined as V_RD-V_RD.
4. The differential output signal of the transmitter and the differential input signal of the receiver each range from A
- B to -(A - B) Volts.
5. The peak value of the differential transmitter output signal and the differential receiver input signal is A - B Volts
6. The peak-to-peak value of the differential transmitter output signal and the
7. Differential receiver input signal is 2 * (A - B) Volts
Figure 24 Differential Peak-Peak Voltage of Transmitter or Receiver
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March 19, 2007
„2005 Integrated Device Technology, Inc. All rights reserved. Advanced Datasheet for informational purposes only. Product specifications subject to change without notice.NOT AN OFFER FOR SALE The information presented herein is subject to a
Non-Disclosure Agreement (NDA) and is for planning purposes only. Nothing contained in this presentation, whether verbal or written, is intended as, or shall have the effect of, a sale or an offer for sale that creates a contractual power of acceptance.