LeCroy DDA 7 Zi series, Operator'S Manual

Page: 443 / 544

Operator's Manual
WP700Zi-OM-E-RevA
442
For example, the FSB mode requires setting up multiple channels to carry out the eye diagram measurements,
as described in the example below. The Gated Eye Diagram requires at least two inputs: The Data and the Gate
signal. The Transition Mode requires at least one input (the Data Stream, but depending on the specific serial
data standard, a clock input may also be required to recover the clock information).
These signals (except for the strobes) are differential signals, so the use of differential probes is often required to
carry out the measurements. As with any high-speed precision measurements, all probes and SMA cables should
be calibrated and deskewed prior to any data collection.
Example Setups
FSB Eye Mode Configuration
Channel Setup
x
DataStrobep: Channel 1 (M1)
x
DataStroben: Channel 2 (M2)
x
Data1: Channel 3 (M3)
x
Data2: Channel 4 (M4)
Serial Data Analysis Setup
1. Select Signal Type: FSB 533MHz, 667MHz or 800MHz
2. Uncheck Recover Clock -- No clock recovery is required in FSB case
3. Select Eye Diagram Tab, then configure the screen as follows:
ƒ
Mode: FSB
ƒ
Data Source 2: Channel 4 (M4)
ƒ
DSTBP: Channel 1 (M1)
ƒ
DSTBN: Channel 2 (M2)
The screen should look like this.