Tektronix 071-0590-00 user manual Basics, Creating Word Patterns Using Front Panel Controls

Reference

Word Patterns

This section explains how to create, edit, save, and recall WORD patterns using front panel controls or the Menu system.

Basics

You may create and save up to ten WORD patterns in battery-backed memory locations WORD 0 through WORD 9. In addition, the current WORD pattern is stored in battery-backed memory. In standard units, each of the saved WORDs and the current WORD can contain up to 16 bits. In Generators and Analyzers equipped with the 1-Mbit Option, which provides additional battery-backed memory, each of the saved WORDs and the current WORD can contain up to 64kbits (with fewer memory buffers, larger WORD patterns can be saved).

There are three ways to create GB1400 WORD patterns:

Using front panel controls. This is usually the quickest way to create and edit short patterns. It also can be a practical way to edit a few bytes in long patterns if these bytes are located near to each other.

Using the Menu system. Because it provides direct byte addressing, this is often the best method for editing a few widely scattered bytes in long WORD patterns. The Menu system also provides the FILL function, used to load a user-specified 8-bit pattern into all bytes, and the ORDER function, used to set the bit-order in each byte to MSB or LSB first. Thus you can use the Menu system to create long WORDs with simple bit patterns using its byte fill, order, and editing capabilities.

Downloading: This is the best way to create long WORDs with complex patterns. Long WORD patterns may be created on an external controller, using a text editor or specialized software, and downloaded via the instrument's GPIB or RS-232 ports. Downloading is the only practical way to create simulations of SONET, SDH, FDDI or other framed signals.

Creating Word Patterns Using Front Panel Controls

Standard Instruments

Use the following procedure to create WORD patterns using front panel controls in standard instruments, that is Analyzers and Generators not equipped with the

1-Mbit Option:

1.If you are using a previously saved pattern as the basis for the new pattern, recall this pattern from memory. (See Recalling Word Patterns).

2.Press the WORD key. The LED in the WORD key will turn on (indicating that the instrument is in the WORD editing mode) and the display will show the bit sequence of the current WORD pattern in binary format. The WORD may contain either one or two bytes, that is 8 or 16 bits. Word length (8 or

16)is displayed after the WORD's bit sequence.

GB1400 User Manual 3-5