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Schematic capture or schematic entry is a step in the design cycle of electronic design automation (EDA) at which the electronic diagram, or electronic schematic of the designed electronic circuit is created by a designer. This is done interactively with the help of a schematic capture tool also known as schematic editor.

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The circuit design is the first step of actual design of an electronic circuit. Typically sketches are drawn on paper, and then entered into a computer using a schematic editor. Therefore schematic entry is said to be a front-end operation of several others in the design flow.

Despite the complexity of modern components – huge ball grid arrays and tiny passive components – schematic capture is easier today than it has been for many years. Brainworx bx_console review. CAD software is easier to use and is available in full-featured expensive packages, very capable mid-range packages that sometimes have free versions and completely free versions that are either open source or directly linked to a printed circuit board fabrication company.

In past years, schematic diagrams with mostly discrete components were fairly readable. However, with the newer high pin-count parts and with the almost universal use of standard letter or A4 sized paper, schematics have become less so. Many times, there will be a single large part on a page with nothing but pin reference keys to connect it to other pages.

Readability levels can be enhanced by using buses and superbuses, related pins can be connected into a common bus and routed to other pages. Buses don't need to be just the traditional address or data bus directly linked pins. A bus grouping can also be used for related uses, such as all analog input or all communications related pin functions.

Other considerations[edit]

After the circuit design is captured in a schematic, most EDA tools allow the design to be simulated.

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Schematic capture involves not only entering the circuits into the CAD system, but also generally calls for decisions that may seem more appropriate for later in the design, such as package choice. Although you may be able to change the package later, many PCB CAD systems ask you to choose both the part and package when placing it into the schematic capture program.

This also brings into play such considerations as prototyping and assembly. In a high-volume assembly environment, there will be plenty of opportunities for DFM analysis. However, in a rapid prototyping environment such as at assembly houses specializing in low-volume/high-mix and quick turnaround times, the pick and place machines are programmed directly from the board layout files. Careful package selection during schematic capture will save time during the assembly and debug process.

With new parts, the CAD system may not have your chosen component in its parts library, so you may need to create the parts library yourself. Bruno mars xxiv album download. Again, you may at the time not be overly concerned with the package, but careful creation of the part library will save time and risk later.

After the circuit design is captured in a schematic, then the PCB layout can begin.

See also[edit]

Further reading[edit]

• Pratt, Gary; Jarrett, Jay (2001-08-06). 'Top-Down Design Methods Bring Back The Useful Schematic Diagram'. Electronic Design. 49 (16): 69. ISSN0013-4872. ED Online ID #3784.

Introduction

This document describes the Embedded Packet Capture (EPC) feature in Cisco IOS^® software.

Prerequisites

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Requirements

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There are no specific requirements for this document.

Components Used

The information in this document is based on these software and hardware versions:

• Cisco IOS Release 12.4(20)T or later
• Cisco IOS-XE Release 15.2(4)S - 3.7.0 or later

The information in this document was created from devices in a lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Background Information

When enabled, the router captures the packets sent and received. The packets are stored within a buffer in DRAM and are thus not persistent through a reload. Once the data is captured, it can be examined in a summary or detailed view on the router. In addition, the data can be exported as a packet capture (PCAP) file to allow for further examination. The tool is configured in exec mode and is considered a temporary assistance tool. As a result, the tool configuration is not stored within the router configuration and will not remain in place after a system reload.

The Packet Capture Config Generator and Analyzer tool is available for Cisco Customers to aid in the configuration, capture, and extraction of packet captures.

Cisco IOS Configuration Example

Basic EPC Configuration

1. Define a 'capture buffer', which is a temporary buffer that the captured packets are stored within. There are various options that can be selected when the buffer is defined; such as size, maxium packet size, and circular/linear:
   
2. A filter can also be applied to limit the capture to desired traffic. Define an Access Control List (ACL) within config mode and apply the filter to the buffer:
   
3. Define a 'capture point', which defines the location where the capture occurs. The capture point also defines whether the capture occurs for IPv4 or IPv6 and in which switching path (process versus cef):
   
4. Attach the buffer to the capture point:
   
5. Start the capture:
   
6. The capture is now active. Allow collection of the necessary data.
   
7. Stop the capture:
   
8. Examine the buffer on the unit:
   

   Note: This output only shows the hex dump of the packets captures. In order to see them in human readable there are two ways.

   1. Export the buffer from the router for further analysis:
      

      Tip: Enhancement request CSCuw77601 has been filed in order to add a mail-to option under export so you can email the buffer diretly to an email-id.

   2. However the previous method is not always practical as it required T/FTP access to the router. In such situations, you can take a copy of the hex dump and use any online hex-pcap convertor in order to view the files.
9. Once the necessary data has been collected, delete the 'capture point' and 'capture buffer':

Notes:

• In releases earlier than Cisco IOS Release 15.0(1)M, the buffer size was limited to 512K.
• In releases earlier than Cisco IOS Release 15.0(1)M, the captured packet size was limited to 1024 bytes.
• The packet buffer is stored in DRAM and will not persist through reloads.
• The capture configuration is not stored in NVRAM and will not persist through reloads.
• The capture point can be defined to capture in the cef or process switching paths.
• The capture point can be defined to capture only on an interface or globally.
• When the capture buffer is exported in PCAP format, L2 information (such as Ethernet encapsulation) is not preserved.
• SeeBest Practices for searching Commandsin order to obtain more information on the commands used in this section.

Cisco IOS-XE Configuration Example

The Embedded Packet Capture feature was introduced in Cisco IOS-XE Release 3.7 - 15.2(4)S. The configuration of the capture is different than Cisco IOS as it adds more features.

Basic EPC Configuration

1. Define the location where the capture will occur:
   
2. Associate a filter. The filter may be specified inline, or an ACL or class-map can be referenced:
   
3. Start the capture:
   
4. The capture is now active. Allow it to collect the necessary data.
   
5. Stop the capture:
   
6. Examine the capture in a summary view:
   
7. Examine the capture in a detailed view:
   
8. In addition, export the capture in PCAP format for further analysis:
   
9. Once the necessary data has been collected, remove the capture:
   

Notes:

• The capture can be performed on physical interfaces, sub-interfaces, and tunnel interfaces.
• Network Based Application Recognition (NBAR) based filters, that use the match protocol command under the class-map, are currently not supported.
• See Best Practices for searching Commands in order to obtain more information on the commands used in this section.

Verify

There is currently no verification procedure available for this configuration.

Troubleshoot

This section provides information you can use to troubleshoot your configuration.

For EPC that runs on Cisco IOS-XE, this debug command can be used to ensure EPC is set up properly:

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