LeCroy DDA 7 Zi series, Operator'S Manual

Page: 222 / 544

WavePro 7Zi
221
WP700Zi-OM-E-RevA
Note: All values entered in this field
are always in decimal format.
Bytes Length Max - If the Data
Length Condition (see below) is
selected to be either INRANGE or
OUT(of)RANGE, then you will also
need to specify a maximum data
length value (i.e., the upper value of
the range you wish to include or
exclude)
Length Condition - The Data Length
Condition can be set to many different
values, such as <=, <, =, >, >=, not =,
INRANGE, or OUT(of)RANGE. Select
the correct condition for your needs.
Ack Setup
Use this setup to choose whether you want to add an Acknowledge bit condition to your ADDR,
ADDR+DATA, FRAME LENGTH, or EEPROM trigger condition. DON’T CARE would be the
most common setup, although ACK or NO ACK might be a useful condition to add for an unusual
or hard-to-find I
2
C problem. An example of this would be triggering on an EEPROM write
(selected by an ADDR trigger) where the EEPROM failed to acknowledge a byte written.
Overview of SPIbus
Both SPIbus TD and D options contain powerful software algorithms to extract serial data information from
physical layer waveforms measured on your oscilloscope. The extracted information is overlaid (annotated) on the
actual physical layer waveforms, and color-coded to provide fast, intuitive understanding.
The SPIbus TD option contains a data trigger that can be configured for the many variants of SPI, such as SSPI
(single master and slave with predetermined format settings) and SIOP. The basic SPI Type is all-inclusive and
the SSPI and SIOP types are just pre-selected settings in the basic SPI trigger.
The SPI trigger does not require use of a Chip Select line. In its place is the ability to set a Minimum Interframe
Time that corresponds to a time that is (typically) 4x a single bit time and less than the interframe time between
different message packets. By eliminating the requirement to have a Chip Select line present, an additional
oscilloscope channel is preserved for use with other analog signals - a significant feature.