- n. 条款；[计] 子句
clause2019-09-25 18:48:04clause 英[klɔːz]美[klɔz]口语练习跟读 n. 条款；[计] 子句 specify 英['spesɪfaɪ]美['spɛsɪfaɪ]口语练习跟读 vt. 指定；详细说明；列举；把…列入说明书 either 英['aɪðə; 'iː-]美['ið...
Refactor JoinClause to use a Clause join clause2020-12-27 21:13:21<div><p>The JoinClause can now use any Clause as a "ON" clause. <p>Additionaly, the join clause between two tables can be guessed automatically it one and only one foreign key links them.</p>...
FILTER clause2020-11-30 11:26:49<div><p>I'd like to make a contribution by implementing the <code>FILTER</code> clause, as better described in these blog posts: ...
MDIO Clause 45 和Clause 222020-06-28 16:42:48MDIO Clause 45 和Clause 22 Contents MDIO History Theory of Operation Clause 22 Clause 45 References MDIO History Management Data Input/Output, or MDIO, is a 2-wire serial bus that is used to manage ...
MDIO Clause 45 和Clause 22
Contents MDIO History Theory of Operation Clause 22 Clause 45 References MDIO History Management Data Input/Output, or MDIO, is a 2-wire serial bus that is used to manage PHYs or physical layer de]
- MDIO History
- Theory of Operation
- Clause 22
- Clause 45
Management Data Input/Output, or MDIO, is a 2-wire serial bus that is used to manage PHYs or physical layer devices in media access controllers (MACs) in Gigabit Ethernet equipment. The management of these PHYs is based on the access and modification of their various registers.
MDIO was originally defined in Clause 22 of IEEE RFC802.3. In the original specification, a single MDIO interface is able to access up to 32 registers in 32 different PHY devices. These registers provide status and control information such as: link status, speed ability and selection, power down for low power consumption, duplex mode (full or half), auto-negotiation, fault signaling, and loopback.
To meet the needs the expanding needs of 10-Gigabit Ethernet devices, Clause 45 of the 802.3ae specification provided the following additions to MDIO:
- Ability to access 65,536 registers in 32 different devices on 32 different ports
- Additional OP-code and ST-code for Indirect Address register access for 10 Gigabit Ethernet
- End-to-end fault signaling
- Multiple loopback points
- Low voltage electrical specification
The MDIO bus has two signals: Management Data Clock (MDC) and Managment Data Input/Ouput (MDIO).
MDIO has specific terminology to define the various devices on the bus. The device driving the MDIO bus is identified as the Station Management Entity (STA). The target devices that are being managed by the MDC are referred to as MDIO Manageable Devices (MMD).
The STA initiates all communication in MDIO and is responsible for driving the clock on MDC. MDC is specified to have a frequency of up to 2.5 MHz.
Clause 22 defines the MDIO communication basic frame format (figure 13) which is composed of the following elements:
Figure 13: Basic MDIO Frame Format
ST 2 bits Start of Frame (01 for Clause 22) OP 2 bits OP Code PHYADR 5 bits PHY Address REGADR 5 bits Register Address TA 2 bits Turnaround time to change bus ownership from STA to MMD if required DATA 16 bits Data
Driven by STA during write
Driven by MMD during read
The frame format only allows a 5-bit number for both the PHY address and the register address, which limits the number of MMDs that the STA can interface. Additionally, Clause 22 MDIO only supports 5V tolerant devices and does not have a low voltage option.
In order to address the deficiencies of Clause 22, Clause 45 was added to the 802.3 specification. Clause 45 added support for low voltage devices down to 1.2V and extended the frame format (figure 14) to provide access to many more devices and registers. Some of the elements of the extended frame are similar to the basic data frame:
Figure 14: Extended MDIO Frame Format
ST 2 bits Start of Frame (00 for Clause 45) OP 2 bits OP Code PHYADR 5 bits PHY Address DEVTYPE 5 bits Device Type TA 2 bits Turnaround time to change bus ownership from STA to MMD if required ADDR/DATA 16 bits Address or Data
Driven by STA for address
Driven by STA during write
Driven by MMD during read
Driven by MMD during read-increment-address
The primary change in Clause 45 is how the registers are accessed. In Clauses 22, a single frame specified both the address and the data to read or write. Clause 45 changes this paradigm. First an address frame is sent to specify the MMD and register. A second frame is then sent to perform the read or write.
The benefits of adding this two cycle access are that Clause 45 is backwards compatible with Clause 22, allowing devices to interoperate with each other. Secondly, by creating a address frame, the register address space is increased from 5 bits to 16 bits, which allows an STA to access 65,536 different registers.
In order to accomplish this, several changes were made in the composition of the data frame. A new ST code (00) is defined to identify Clause 45 data frames. The OP codes were expanded to specify an address frame, a write frame, a read frame, or a read and post read increment address frame. Since the register address is no longer needed, this field is replaced with DEVTYPE to specify the targeted device type. The expanded device type allows the STA to access other devices in addition to PHYs.
Additional details about Clause 45 can be found on the IEEE 802.3 workgroup website.
- IEEE 802 LAN/MAN Standards Committee
- Use The MDIO Bus To Interrogate Complex Devices– Electronic Design Magazine
- MDIO Clause 22 and Clause 45
- MDIO Clause 45 和Clause 22
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Extracts clause creation into clause methods.2020-12-09 06:52:29Originally, this method had several sanitization steps for each clause baked directly into the method. This update has broken each clause into their own method. This makes it easier to build secure ...
ORDER BY clause is not in GROUP BY clause2020-06-30 09:24:45[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY ...
[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
MySQL 5.7.5及以上功能依赖检测功能。如果启用了ONLY_FULL_GROUP_BY SQL模式（默认情况下），MySQL将拒绝选择列表，HAVING条件或ORDER BY列表的查询引用在GROUP BY子句中既未命名的非集合列，也不在功能上依赖于它们。（5.7.5之前，MySQL没有检测到功能依赖关系，默认情况下不启用ONLY_FULL_GROUP_BY。有关5.7.5之前的行为的说明，请参见“MySQL 5.6参考手册”。）
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deducing from clause2021-01-08 09:05:06Having a full query definition including the select part and excluding the from-clause a minimal from-clause is deductive. <p>QueryDSL tuple projection example: List tuples = queryFactory.select...
Please change License to 2-clause or 3-clause BSD2020-11-21 23:52:20<p>According to <a href="http://en.wikipedia.org/wiki/BSD_licenses">BSD licenses - Wikipedia, the free encyclopedia, 4-clause BSD is not compatible with GPLv2, but 2-clause or 3-clause BSD is. ...
Relative clause markers2020-12-09 14:35:11<div><p>The guidelines state that relative clause introducing words like English "that" should be tagged as <code>SCONJ</code>. I have two questions: 1. I noticed that in the English data ...
Transform SIZE in where clause to COUNT in having clause2020-12-08 19:25:40<div><p>Instead of creating a subquery for the SIZE function when appearing in the where clause, we can transform it into - A newly generated JOIN node - GROUP BY parent JOIN node - and replace the ...
Where clause help2020-12-08 20:48:55<p>Uncaught TypeError: Argument 1 passed to FaaPz\PDO\AdvancedStatement::where() must be an instance of FaaPz\PDO\Clause\Conditional, string given, called in filename.... <p>and second gives me the ...
which is not functionally dependent on columns in GROUP BY clause2019-07-15 12:23:09mysql出现which is not functionally dependent on columns in GROUP BY clause报错欢迎使用Markdown编辑器总结 欢迎使用Markdown编辑器 假设查询语句是下面这样： SELECT d_1 FROM table WHERE id = 1 GROUP ...
SELECT d_1, create_date FROM table WHERE id = 1 GROUP BY create_date
SELECT any_value(d_1) create_date FROM table WHERE id = 1 GROUP BY create_date
2. 关闭ONLY_FULL_GROUP_BY模式。关于这个模式，是mysql提供的安全检查。 直接设置为一个新值就完事了：
SET GLOBAL sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
ystemctl restart mysqld.service
Having clause support2021-01-07 11:43:59<div><p>Hi! Any chance to get having clause supported? As it is so important in OLAP.</p><p>该提问来源于开源项目：apache/incubator-pinot</p></div>
Clause de documentation2020-12-27 05:05:25une clause portant sur la documentation. Dans le manifesto des méthodes agiles, on peut y lire: <p>Je pense qu'il pourrait être intéressant d'ajouter cette clause explicitant la présence d...
Sql报错：[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains ...2020-01-11 12:21:18Mysql换成8.0版本报错；1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.
Incorrect Limit clause2020-11-22 22:41:00ve come across a problem that kundera adds limit clause to the cql while using JPA model. I just want to select all the entities, but it add "limit 0", which causes the problem. <p>Can you ...
SQL HAVING Clause2019-01-19 10:52:12SQL HAVING Clause
Remove Commons Clause modules2020-11-29 13:57:50<p>The Commons Clause, when applied to an OSI-approved license, creates a new license that violates the Open Source Definition (OSD). The OSI does not approve licenses that violate the OSD and does ...
MySQL 之 ORDER BY clause is not in GROUP BY clause2019-09-02 17:50:02055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'basedb.tcd.sale_day' which is not functionally dependent on columns in GROUP BY clause; this is inco...
MySQL异常:[Err] 1055 – Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nona...2020-12-14 13:31:45[Err] 1055 – Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column ‘information_schema.PROFILING.SEQ’ which is not functionally dependent on columns in GROUP ...
Major license change: 4-clause BSD to 3-clause BSD2020-12-26 16:23:28<div><p>This pull request is an attempt to relicense critical files in the libnet project from the 4-clause to 3-clause BSD license. I've opened the PR to start a discussion with as many of the ...
[YSQL] Enabled USING clause in DELETE and FROM clause in UPDATE2021-01-11 21:30:31<div><p>This pull request enables USING clause in DELETE and FROM clause in UPDATE in gram.y for queries like: <pre><code> DELETE FROM a_table USING another_table WHERE a_table.id = another_table....
解决MySQL 1055 - ORDER BY clause is not in GROUP BY clause2020-09-02 15:53:59[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column ‘information_schema.PROFILING.SEQ’ which is not functionally dependent on columns in GROUP ...
Into Clause VS Let Clause2013-05-11 23:13:021.Into Clause 用来将select, join,或者group的结果存储到一个临时变量中。 目的：在之后的查询中需要使用此结果。例如： var developersGroupedByLanguage = from d in developers group d by d....
7.2.2. The WHERE Clause2021-01-01 20:51:537.2.2. The WHERE Clause 7.2.2.where子句 The syntax of the WHERE Clause is where子句的语法如下： WHERE search_condition where search_condition is any value expression (see Section 4.2) ...
Horn Clause霍尔语句2021-01-19 20:31:43应用 逻辑学家Alfred Horn提出了这样一个概念，便于进行逻辑推理。...如果一个clause最多只有1个结论，那么这种clause就称为horn clause。 例如： 1.parent(X, Z), parent(Z, Y) -> grandparent(X, Y) 2.go
Export with where clause2020-12-25 18:58:28<p>I want to export an entity with a where clause in the SQL. I have this : <pre><code> php $sqlQuery = $em->getRepository('AppBundle:Member') ->createQueryBuilder('m') -...