342 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

Creating and Downloading User-Data Files

Data Transfer Troubleshooting (N5182A, E4438C and E8267D Only)

Data Requirements• The signal generator requires a file with a minimum of 60 bytes• For every data bit (bit 0), you must provide 7 bits of control information (bits 1-7).
ERROR -223, Too much data
PRAM download exceeds the size of PRAM memory.
Either use a smaller pattern or get more memory by ordering the appropriate
hardware option.

Tabl e 8 -1 4 PRAM Da ta By te

Bit Function Value Comments
0 Data 0/1 This is the data (payload) bit. It is “unspecified” when burst (bit 2) is set to 0.
1 Reserved 0 Always 0
2 Burst 0/1 1 = RF on
0 = RF off
For non-bursted, non-TDMA syste ms, to have a continuous signal, set this bit to 1 for all
bytes. For framed data, set this bit to 1 for on timeslots and 0 for off timeslots.
3 Reserved 0 Always 0
4 Reserved 1 Always 1
5 Reserved 0 Always 0
6EVENT1
Output
0/1 To have the signal generator output a single pulse at the EVENT 1 connector, set this bit
to 1. Use this output for functions such as a triggering external hardware to indicate when
the data pattern begins and restarts, or creating a data-synchronous pulse train by
toggling this bit in alternate bytes.
7 Pattern Reset 0/1 0 = continue to next sequential memory address.
1 = end of memory and restart memory playback.
This bit is set to 0 for all bytes except the last byte of PRAM. To restart the pattern, set
the last byte of PRAM to 1.

Table8-13 PRAM Download - Symptoms and Causes

Symptom Possible Cause