Atec Agilent-DSO8104A - Manual (Page 3)

3
Infiniium Benefits
(continued)
MSO viewing and triggering
No matter how complicated the
signals you are dealing with,
the Infiniium MSO comes with
powerful viewing and triggering
capabilities to help you untangle
them. The Infiniium MSO can
trigger across all 16 digital
channels and four scope channels.
There are no limitations on the
combination of analog and digital
channels that can be used for
a particular pattern or state
trigger setting. This enables you
to easily isolate and analyze
complex interactions between
digital signals and analog content
in your design. Once your trigger
condition is set, seamlessly view
the cause-and-effect relationships
and make measurements across
all 20 channels.
MSO application
With more sophisticated memory
buses such as SDRAM being
deployed in embedded designs, it
is important to be able to isolate
a particular cycle of the memory
bus that may be causing a
problem. Isolating a SDRAM write
cycle requires triggering across
four digital channels when CS,
CAS, and WE signals are low and
RAS is high, along with one analog
channel on a rising edge of Clk.
You need a second analog channel
to capture a data bit of the
SDRAM bus that you suspect has
signal integrity problems. With
the write cycle isolated, you can
create an eye diagram of the data
bit with fast waveform update
rates and then worst-case setup
and hold time measurements can
be made, while also revealing
anomalies or glitches. Doing this
type of analysis with a traditional
two or four-channel oscilloscope,
or with a two-box logic analyzer
and traditional oscilloscope,
would be difficult or impossible.