Tag: constraints

FPGA design timing constraints 4. Multi-cycle constraints

Table of Contents 1. Background 2. set_multicycle_path a) Targets interface b) options interface c)The relationship between setup and hold 3. Multi-cycle constraint scenario 3.1 Multi-cycle constraints in a single clock domain 3.2 Multi-cycle path and clock phase shift 3.3 Multi-cycle constraints from slow clock to fast clock 3.4 Multi-cycle constraints from fast clock to slow […]

hibernate.validator.constraints.NotEmpty error when verifying request parameters java.lang.NoClassDefFoundError: javax/el/PropertyNot…

In the spring maven project, use hibernate validator to annotate the input parameter object of the formal verification method. hibernate-validator version: 5.0.2.Final validation-api version: 1.1.0.Final There is an attribute named order_time in the model class annotated with @NotEmpty: package com.emax.paycenter.dto.external; import org.hibernate.validator.constraints.NotEmpty; import org.hibernate.validator.constraints.URL; import javax.validation.constraints.Min; import javax.validation.constraints.NotNull; import java.io.Serializable; /** * Scan QR code […]

FPGA design timing constraints 3. Set clock groups set_clock_groups

Table of Contents 1. Background 2. Relationship between clocks 2.1 Clock relationship classification 2.2 View clock relationship 3. Asynchronous clock group 3.1 Priority 3.2 Use format 3.3 asynchronous and exclusive 3.4 Example of results 4. Reference materials 1. Background The timing analysis tool in Vivado will analyze all clock-related timing paths in the design by […]

Tables, constraints, and other database objects

# Tables, constraints, and other database objects “` 1.Creation and deletion of tables 1.1. Create table: Syntax: create table table name ( Field name Field type Default value (default), Field name Field type Default value (default), Field name Field type Default value (default), Field name Field type Default value (default) ) \tNaming conventions: Table name: […]

FPGA design timing constraints 2. Input delay and output delay

Table of Contents 1. Background 2. set_input_delay 2.1 set_input_delay meaning 2.2 set_input_delay parameter description 2.3 Usage examples 3. set_output_delay 3.1 set_output_delay meaning 3.2 set_output_delay parameter description 3.3 Usage examples 4. Sample project 4.1 Engineering code 4.2 Timing Report 5. Reference materials 1. Background In order to accurately simulate the timing of signal transmission from FPGA […]

[SQL Server] Foreign key constraints

Foreign key constraints prologue foreign key constraints Preamble In many scenarios, foreign keys are used to associate the master-slave relationship between two or more tables, so as to quickly query the relationship between data through foreign key fields. In fact, foreign keys are still relatively vague in my concept, and I have never really used […]

mysql keys, data constraints in database tables (PRIMARY KEY, UNIQUE, NOT NULL, DEFAULT, CHECK, FOREIGN KEY) composite primary key constraints, unique constraints, default constraints, check constraints, foreign key constraints. cascade

Let’s first look at the explanation of the results of the desc xxx table in mysql: The “Field” column displays the name of each field (i.e., column) of the table. The “Type” column shows the data type of each field. The “Null” column indicates whether the field can be NULL. If the field does not […]

FPGA design timing constraints 1. Main clock and generated clock

?Directory 1. Master clock create_clock 1.1 Definition 1.2 Constraint setting format 1.3 Add this clock to the existing clock 1.4 Example 1.5 Differential signals 2. Generate clock generate_clock 2.1 Definition 2.2 Format 2.2.1 by clock frequency 2.2.2 by clock edges 2.2.3 Example 2.2.4 Automatically generate clock 2.2.5 Rename the generated clock 1. Main clock create_clock […]