Generating and checking a quaternary pseudo random binary sequence

A pseudo-random binary and sequence technology, applied to random number generators, electrical components, instruments, etc., can solve problems such as baseline drift and clock content

Active Publication Date: 2019-01-04
XILINX INC
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However, PRBS patterns when mapped to PAM4 ...

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  • Generating and checking a quaternary pseudo random binary sequence
  • Generating and checking a quaternary pseudo random binary sequence
  • Generating and checking a quaternary pseudo random binary sequence

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Embodiment Construction

[0041] In the following description, numerous specific details are set forth in order to provide a more thorough description of specific examples described herein. It will be apparent, however, to those skilled in the art that one or more other examples and / or variations of these examples may be practiced without all of the specific details presented below. In other instances, well-known features have not been described in detail so as not to obscure the description of the examples of the present application. For ease of illustration, the same numerical designations are used in different figures to refer to the same items; however, in alternative examples, the items may be different.

[0042] This application describes exemplary devices and / or methods. It should be understood that the word "exemplary" is used in this application to mean "serving as an example, instance, or illustration." Any example or feature described in this application as "exemplary" is not necessarily t...

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Abstract

An apparatus (100, 200) and method (160, 270) relate generally to generation and checking of a quaternary pseudo random binary sequence ("QPRBS"). In an apparatus (100), there is a pseudo random binary sequence ("PRBS") generator (10) configured to receive a seed (111 ) of a PRBS (14) to be generated. A mask generator (110) is configured to generate a mask output (115) corresponding to the PRBS (14). The PRBS generator (10) and the mask generator (110) are both configured for sequential operation with respect to one another. A masking circuit (117) is configured to receive the mask output (115) and the PRBS (14) to bitwise mask the PRBS (14) with the mask output (115) to generate the QPRBS (105).

Description

technical field [0001] The following description refers to integrated circuit (IC) devices. More specifically, the following description relates to generating and checking a quaternary pseudorandom sequence in an IC. Background technique [0002] Pulse amplitude modulation (PAM) is a common mechanism for high-speed applications such as the physical link layer, with PAM2 (also known as NRZ) being the most commonly used to support serial communications up to 28 gigabits per second (Gbps). The recent PAM4 is proposed to be used in high-speed communication links exceeding 28Gbps. PAM4 uses four different amplitude levels (for example, -1, -1 / 3, +1 / 3, +1 volts), each amplitude level Level is represented by a combination of two bits (eg, 00, 01, 10, 11). [0003] To test a high speed communication link, a test pattern may be sent by the transmitter over such a communication link for reception and error checking of the receiver. Thus, such test patterns can be used to determine ...

Claims

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Application Information

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IPC IPC(8): G06F7/58
CPCG06F7/582H04L1/244H04L25/4917H04L25/03343
Inventor W·林
Owner XILINX INC
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