Invention Grant
- Patent Title: Method, apparatus, system for centering in a high performance interconnect
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Application No.: US15632836Application Date: 2017-06-26
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Publication No.: US10560081B2Publication Date: 2020-02-11
- Inventor: Mahesh Wagh , Zuoguo J. Wu , Venkatraman Iyer , Gerald S. Pasdast , Todd A. Hinck , David M. Lee , Narasimha R. Lanka
- Applicant: Intel Corporation
- Applicant Address: US CA Santa Clara
- Assignee: Intel Corporation
- Current Assignee: Intel Corporation
- Current Assignee Address: US CA Santa Clara
- Agency: Alliance IP, LLC
- Main IPC: H03K5/26
- IPC: H03K5/26 ; G01R31/04 ; H03L9/00 ; G06F1/3296 ; G06F13/42 ; H03K5/131

Abstract:
In an example, a system and method for centering in a high-performance interconnect (HPI) are disclosed. When an interconnect is powered up from a dormant state, it may be necessary to “center” the clock signal to ensure that data are read at the correct time. A multi-phase method may be used, in which a first phase comprises a reference voltage sweep to identify an optimal reference voltage. A second phase comprises a phase sweep to identify an optimal phase. A third sweep comprises a two-dimensional “eye” phase, in which a plurality of values within a two-dimensional eye derived from the first two sweeps are tested. In each case, the optimal value is the value that results in the fewest bit error across multiple lanes. In one example, the second and third phases are performed in software, and may include testing a “victim” lane, with adjacent “aggressor” lanes having a complementary bit pattern.
Public/Granted literature
- US20170294906A1 METHOD, APPARATUS, SYSTEM FOR CENTERING IN A HIGH PERFORMANCE INTERCONNECT Public/Granted day:2017-10-12
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