Fast equalization method, chip, and communications system

Patent metadata

Field	Value
Publication number	US-11496340-B2
Application number	US-202017100033-A
Country	US
Kind code	B2
Filing date	Nov 20, 2020
Priority date	Jun 19, 2018
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

A fast equalization method is provided, which includes: storing a receive parameter and a transmit parameter, of each of a primary chip and a secondary chip, that meet a link stability requirement and that are obtained when link equalization is previously performed; and when determining that link equalization needs to be performed, configuring, as first fast equalization timeout duration, a larger value in initial fast equalization timeout duration of the primary chip and initial fast equalization timeout duration of the secondary chip, and invoking the foregoing receive and transmit parameters, so that the primary chip and the secondary chip perform a current time of link equalization based on the first fast equalization timeout duration and the foregoing transmit and receive parameters.

First claim

What is claimed is:

1. A fast equalization method, comprising:
storing first equalization parameters that satisfy a link stability requirement and are obtained when an (N−a) th time of link equalization is performed, wherein the first equalization parameters comprise a receive parameter and a transmit parameter of a primary chip and a receive parameter and a transmit parameter of a secondary chip, N≥2, 1≤a<N, and both a and N are integers;
in response to determining that an N th time of link equalization needs to be performed, reading a first initial fast equalization timeout duration of the primary chip and a second initial fast equalization timeout duration of the secondary chip, wherein the first initial fast equalization timeout duration is less than or equal to an equalization timeout duration that is of the primary chip in a fourth phase of equalization and that exists when the (N−a) th time of link equalization is performed, wherein the second initial fast equalization timeout duration is less than or equal to an equalization timeout duration that is of the secondary chip in a third phase of equalization and that exists when the (N−a) th time of link equalization is performed, wherein both the first and second initial fast equalization timeout durations are device advertised values and are hardware initialized values;
configuring a first fast equalization timeout duration based on the first and second initial fast equalization timeout durations-; and
invoking the first equalization parameters, so that the primary chip and the secondary chip perform the N th time of link equalization based on the first fast equalization timeout duration and the first equalization parameters, wherein the first fast equalization timeout duration is a larger value of the first and second initial fast equalization timeout durations-,
wherein the first fast equalization timeout duration represents an equalization timeout duration that is of the primary chip in the third phase of equalization and that exists when the N th time of link equalization is performed and an equalization timeout duration that is of the primary chip in the fourth phase of equalization and that exists when the N th time of link equalization is performed, and
wherein the first fast equalization timeout duration represents an equalization timeout duration that is of the secondary chip in the third phase of equalization and that exists when the N th time of link equalization is performed and an equalization timeout duration that is of the secondary chip in the fourth phase of equalization and that exists when the N th time of link equalization is performed.

2. The method according to claim 1 , wherein invoking the first equalization parameters comprises:
invoking parameters corresponding to a rate that needs to be reached after the N th time of link equalization is performed and that are in the first equalization parameters, so that the primary chip and the secondary chip perform the N th time of link equalization based on the first fast equalization timeout duration and the parameters corresponding to the rate.

3. The method according to claim 1 , wherein before configuring the first fast equalization timeout duration based on the first and second initial fast equalization timeout durations, the method further comprises:
determining whether the primary chip supports fast equalization; and
determining whether the secondary chip supports the fast equalization; and
wherein configuring the first fast equalization timeout duration comprises:
configuring the first fast equalization timeout duration in response to determining that both the primary chip and the secondary chip support the fast equalization.

4. The method according to claim 3 , wherein determining whether the primary chip supports fast equalization comprises:
when the first initial fast equalization timeout duration is not 0, determining that the primary chip supports the fast equalization.

5. The method according to claim 3 , wherein determining whether the secondary chip supports the fast equalization comprises:
when the second initial fast equalization timeout duration is not 0, determining that the secondary chip supports the fast equalization.

6. The method according to claim 1 , further comprising:
storing second equalization parameters that satisfy the link stability requirement and that are obtained when the N th time of link equalization is performed, wherein the second equalization parameters comprise the receive parameter and the transmit parameter of the primary chip and the receive parameter and the transmit parameter of the secondary chip.

7. The method according to claim 6 , further comprising:
in response to determining that an (N+b) th time of link equalization needs to be performed, configuring second fast equalization timeout duration; and
invoking the second equalization parameters, so that the primary chip and the secondary chip perform the (N+b) th time of link equalization based on the second fast equalization timeout duration and the second equalization parameters,
wherein the second fast equalization timeout duration represents an equalization timeout duration that is of the primary chip in the third phase of equalization and that exists when the (N+b) th time of link equalization is performed and an equalization timeout duration that is of the primary chip in the fourth phase of equalization and that exists when the (N+b) th time of link equalization is performed, and
wherein the second fast equalization timeout duration represents an equalization timeout duration that is of the secondary chip in the third phase of equalization and that exists when the (N+b) th time of link equalization is performed and an equalization timeout duration that is of the secondary chip in the fourth phase of equalization and that exists when the (N+b) th time of link equalization is performed, the second fast equalization timeout duration is the same as the first fast equalization timeout duration, b≥1, and b is an integer.

8. The method according to claim 1 , wherein after the N th time of link equalization is performed, the method further comprises:
clearing the first fast equalization timeout duration.

9. The method according to claim 1 , wherein the primary chip and the secondary chip are connected to each other via a peripheral component interconnect express (PCIe) bus or a cache coherent interconnect for accelerators (CCIX) bus.

10. The method according to claim 1 , further comprising: in response to determining that the N th time of link equalization needs to be performed, performing hot reset and link retrain that are triggered by an operating system.

11. The method according to claim 1 , wherein the first initial fast equalization timeout duration is determined based on a physical layer (PHY) capability supported by the primary chip, or the second initial fast equalization timeout duration is determined based on a PHY capability supported by the secondary chip.

12. A communications system, comprising system software, a primary chip, and a secondary chip, and the primary chip and the secondary chip are connected to each other via a peripheral component interconnect express (PCIe) bus or a cache coherent interconnect for accelerators (CCIX) bus; and
wherein the system software is adapted to perform the fast equalization method according to claim 1 .

13. A fast equalization apparatus, comprising:
a manager adapted to store first equalization parameters that satisfy a link stability requirement and that are obtained when an (N−a) th time of link equalization is performed, wherein the first equaliz

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Yongyao
• Luo Fei
• Nie Er

Classifications

• H04B1/38

  Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving · CPC title

• G06F13/1684

  using multiple buses · CPC title

• H04L25/03012 Primary

  operating in the time domain (H04L25/03165, H04L25/03178 take precedence) · CPC title

• G06F13/4068 Primary

  Electrical coupling · CPC title

• G06F13/4282

  on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247) · CPC title