User’s Guide
Publication number 16760-97007
February, 2002
For Safety information, Warranties, and Regulatory information,
see the pages behind the index.
© Copyright Agilent Technologies 2000-2002
All Rights Reserved
Agilent Technologies Probes for
the 16760A Logic Analyzer
(E5378A, E5379A, E5380A, and E5386A)
Probing Solutions for the Agilent 16760A
High Speed State Analyzer — At a Glance
The Agilent 16760A is a high-speed logic analyzer capable of making state
measurements at clock speeds up to 1.5 Gb/s. For high bandwidth measurements,
the 16760A logic analyzer has both a differential and single-ended probes available.
For target systems designed to use the Agilent E5346A 38-Pin Probe, a probe is
available using an Amp “MICTOR 38” connector.
For more information on the 16760A logic analyzer, refer to the online help in the
product.
E5378A 100-pin Single-ended Probe
Also available as option 010 on the Agilent
16760A.
• 34 Channels
• State speeds up to 1.5 Gb/s
• 250 mV peak-to-peak sensitivity
• 100-pin Samtec connector
• Requires Probing Connector Kit
(see page 44)
E5386A Half-channel Adapter with E5378A
The E5386A adapter maps the 34 signals
from the 100-pin samtec connector to the
16760A when operating in half-channel
state mode..
16760A module
Logic analyzer
probe cables
E5378A 100-pin single-ended
Two 16760A modules
Four
logic analyzer
probe cables
Two E5386A
half-channel adapters
E5378A 100-pin single-ended probe
2
16760A module
E5379A 100-pin Differential Probe
Also available as option 011 on the Agilent
16760A.
Two
logic analyzer
probe cables
Two E5379A
differential probes
16760A module
Two probe
cables
E5386A half-channel
adapter
E5379A differential probe
E5380A 38-pin Single-ended Probe
•17 Channels
•State speeds up to 1.5 Gb/s
•200 mV peak-to-peak sensitivity
•100-pin Samtec connector
•Requires Probing Connector Kit
(see page 44)
E5386A Half-channel Adapter with E5379A
The E5386A adapter maps the 17
differential signals from the 100-pin
Samtec connector to the 16760A when
operating in half-channel state mode.
16760A module
Also available as option 012 on the Agilent
16760A.
• Compatible with boards designed for
Logic analyser
probe cables
Agilent E5346A 38-pin Probe
• 34 Channels
• State speeds up to 600 Mb/s
• 300 mV peak-to-peak sensitivity
• 38-pin MICTOR connector
E5380A 38-pin
single-ended
probe
• Requires AMP MICTOR 38 Connector
and Agilent Support Shroud
(see page 44)
3
In This Book
In this book, you will find information that helps you understand and implement the
high-bandwidth, high density probing solutions available with the Agilent 16760A
high speed state logic analyzer. Use this information to both evaluate the electrical
and mechanical implications to your target system’s design, and to properly select
and layout the proper components used to connect to the logic analyzer.
Chapter 1 is a description of the available probing options.
Chapter 2 covers the mechanical considerations such as connector/shroud type,
footprint for PC board layout, and probe/connector dimensions.
Chapter 3 covers the electrical considerations such as equivalent probe loads
Chapter 4 provides design theory.
Chapter 5 offers a list of recommended reading for additional information.
Chapter 6 lists connectors and shrouds that may be ordered.
4
Contents
E5378A 100-pin Single-ended Probe 2
E5386A Half-channel Adapter with E5378A 2
E5379A 100-pin Differential Probe 3
E5386A Half-channel Adapter with E5379A 3
E5380A 38-pin Single-ended Probe 3
1 Probing Options 9
The E5378A 100-pin Single-ended Probe 10
The E5379A 100-pin Differential Probe 11
The E5380A 38-pin Single-ended Probe 12
The E5386A Half-channel Adapter 13
2 Mechanical Considerations 15
E5378A and E5379A Probe Specifications 16
E5380A 38-pin Single-ended Probe 23
E5386A Half-channel Adapter 28
Used with E5378A 100-pin Single-ended Probe 29
Used with E5379A 100-pin Differential Probe 30
5
Contents
3 Electrical Considerations 31
Equivalent Probe Loads 32
E5378A and E5379A Models 32
E5380A Model 33
4 Circuit Board Design 35
Transmission Line Considerations 36
Thresholds 37
E5378A 100-pin single-ended probe 37
Data inputs 37
Clock input 37
E5379A 100-pin differential probe 38
Data inputs 38
Clock input 38
E5380A 38-pin single-ended probe 39
Labels split across probes 39
Reordered bits 39
Half-channel 1.5 Gb/s mode 40
5 Recommended Reading 41
For More Information 42
MECL System Design Handbook 42
High-speed Digital Design 42
Designing High-speed Target Systems for Logic Analyzer Probing 42
6
Contents
6 Connectors and Shrouds 43
Ordering Probing Connectors and Shrouds 44
7
Contents
8
1
Probing Options
Description of the E5378A, E5379A, E5380A, and E5386 probes.
9
Chapter 1: Probing Options
The E5378A 100-pin Single-ended Probe
The E5378A 100-pin Single-ended Probe
The E5378A is a 34-channel single-ended probe capable of capturing data up to 1.5
Gb/s. The probe has the following inputs:
• 32 single-ended data inputs, in two groups (pods) of 16.
• Two differential clock or data inputs. Refer to page 37 for a discussion of how to
utilize the clock input. Either or both clock inputs can be acquired as data inputs
if not used as a clock.
• Two data threshold reference inputs, one for each pod (group of 16 data inputs).
Refer to page 37 for guidelines and discussion about how to utilize the threshold
inputs.
The Agilent 16760-68702 or 16760-68703 Probing Connector Kit is required for
connecting the E5378A probe to your target system. The kit contains five mating
connectors and five support shrouds. The connectors and shrouds may be ordered
separately if desired. See the table on page 44 for part numbers.
See Also Chapter 2 for the mechanical information to design the connector into your target
system board.
E5378A 100-pin single-ended probe and probing connector kit
10
Chapter 1: Probing Options
The E5379A 100-pin Differential Probe
The E5379A 100-pin Differential Probe
The E5379A is a 17-channel differential probe capable of capturing data up to 1.5
Gb/s. Two E5379A probes are required to support all the inputs on one 16760A. The
probe has the following inputs:
• 16 differential data inputs.
• One differential clock or data input. Refer to page 38 for a discussion of how to
utilize the clock input. The clock input can be acquired as a data input if not used
as a clock.
The Agilent 16760-68702 or 16760-68703 Probing Connector Kit is required for
connecting the E5379A probe to your target system. The kit contains five mating
connectors and five support shrouds. The connectors and shrouds may be ordered
separately if desired. See the table on page 44 for part numbers.
Differential Input Amplitude
Definition.
difference voltage V - V
than or equal to 200 mV p-p.
For differential signals, the
must be greater
See Also
Chapter 2 for the
mechanical
information to design
the connector into
your target system
boards.
E5379A 100-pin differential probe and probing connector kit
11
Chapter 1: Probing Options
The E5380A 38-pin Single-ended Probe
The E5380A 38-pin Single-ended Probe
The E5380A is designed to be compatible with target systems designed for the
Agilent E5346A 38-pin Probe. If you have a target system designed for connection
to the E5346A 38-pin Probe, the E5380A probe will connect directly to the same
connector. The recommended state speed of this probe is 600 Mbits/second. The
minimum input signal amplitude required by the E5380A is 300 mV.
The probe combines two 17-channel cables into a single-ended 38-pin MICTOR
connector. The probe has the following inputs:
• 32 single-ended data inputs, in two groups (pods) of 16.
• Two single-ended clock or data inputs. Refer to page 37 for a discussion of how
to utilize the clock input. Either or both clock inputs can be acquired as data
inputs if not used as a clock.
The Agilent E5346-68701 or E5346-68700 Probing Connector Kit is required for
connecting the E5380A probe to your target system. The kit contains five mating
connectors and five support shrouds. The connectors and shrouds may be ordered
separately if desired. See the table on page 44 for part numbers.
See Also Chapter 2 for the mechanical information to design the connector into your target
system board
E5380A 38-pin single-ended probe and probing connector kit
12
Chapter 1: Probing Options
The E5386A Half-channel Adapter
The E5386A Half-channel Adapter
The E5386A Half-channel Adapter is intended to be used in half-channel state mode
and works with:
• E5378A 100-pin Single-ended Probe
• E5379A 100-pin Differential Probe
The E5386A Half-channel Adapter has it's own ID code. When using the adapter,
the logic analyzer recognizes its code rather than that of the probe which is attached
to the target. Therefore, the user interface format menu doesn't automatically set
thresholds to the right values. You need to go into the threshold menu and select
(differential, custom, or standard settings).
When using the adapter in half-channel state:
• Clock-bits are not available in half-channel state mode (although JCLK on the
master is still used).
• Be sure to connect Master pod 1 of the logic analyzer to the upper bits, 8-15 +
clk, on the half-channel adapter. This is necessary to connect the clock in the
system under test to the logic analyzer system clock.
• Using the E5386A does not reduce the performance of the 16760A and the
E5378A or E5379A system.
If the E5386A is used in full-channel state mode, the thresholds on the unused (odd)
bits are floating. This could result in spurious activity indicators in the format menu.
13
Chapter 1: Probing Options
The E5386A Half-channel Adapter
14
2
Mechanical Considerations
Once you have decided which probe is required, use the following mechanical
information to design the appropriate connector into your target system board.
.
15
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
E5378A and E5379A Probe Specifications
The E5378A and E5379A probes require a probe kit that contains Samtec
connectors and shrouds. Refer to the table in Chapter 6 for the kit part numbers.
Samtec 100-pin connector footprint and support shroud mounting hole
dimensions
CAUTION: The support shrouds are made of conductive metal. Care should be taken to avoid
shorting adjacent boards or components with the shrouds. For this reason it may be
advisable not to connect the shrouds to ground.
16
Samtec 100-pin connector dimensions
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
Support shroud dimensions for 100-pin Samtec connector
17
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
E5378A 100-pin single-ended probe dimensions
E5379A 100-pin differential probe dimensions
18
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
E5378A 100-pin Single-ended Probe Connector
Pin Assignments
Signal
Ground 1 2 Ground
Do Not Connect 3 4 Do Not Connect
Ground 5 6 Ground
Odd D0 7 8 Even D0
Ground 9 10 Ground
Odd D1 11 12 Even D1
Ground 13 14 Ground
Odd D2 15 16 Even D2
Ground 17 18 Ground
Odd D3 19 20 Even D3
Ground 21 22 Ground
Odd D4 23 24 Even D4
Ground 25 26 Ground
Odd D5 27 28 Even D5
Ground 29 30 Ground
Odd D6 31 32 Even D6
Ground 33 34 Ground
Odd D7 35 36 Even D7
Ground 37 38 Ground
Odd D8 39 40 Even D8
Ground 41 42 Ground
Odd D9 43 44 Even D9
Ground 45 46 Ground
Odd D10 47 48 Even D10
Ground 49 50 Ground
Odd D11 51 52 Even D11
Ground 53 54 Ground
Odd D12 55 56 Even D12
Ground 57 58 Ground
Odd D13 59 60 Even D13
Ground 61 62 Ground
Odd D14 63 64 Even D14
Ground 65 66 Ground
Pin
Number
Pin
Number
Signal
19
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
E5378A 100-pin Single-ended Probe Connector
Pin Assignments
Signal
Odd D15 67 68 Even D15
Ground 69 70 Ground
NC 71 72 NC
Ground 73 74 Ground
NC 75 76 NC
Ground 77 78 Ground
Odd D16P/Odd
CLKP
Ground 81 82 Ground
Odd D16N/Odd
CLKN
Ground 85 86 Ground
Odd External Ref 87 88 Even External Ref
Ground 89 90 Ground
NC 91 92 NC
Ground 93 94 Ground
Ground 95 96 Ground
NC 97 98 NC
NC 99 100 NC
Ground pins indicated in this table are grounded in the probe. Grounding of specific
ground pins on the target board is optional. However, the following guidelines
should be observed:
Pin
Number
79 80 Even D16P/Even
83 84 Even D16N/Even
Pin
Number
Signal
CLKP
CLKN
1) Multiple ground returns are desirable to maintain signal integrity. As many probe
ground pins as possible should be connected to ground in the target system board.
2) The ground pins located between signal pins are particularly important because
they provide improved signal-to-signal isolation. This is particularly important for
differential inputs. Excessive coupling between differential inputs causes the
apparent input capacitance to increase. Capacitance between the two sides of a
differential signal will appear to each side as approximately twice the capacitance to
ground, because the capacitance is connected to a signal of opposite polarity. The
best practice is to ground as many of these pins on the target board as possible.
20
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
E5379A 100-pin Differential Probe Connector
Pin Assignments
Signal
Ground 1 2 Ground
Do Not Connect 3 4 Do Not Connect
Ground 5 6 Ground
D0N 7 8 D0P
Ground 9 10 Ground
D1N 11 12 D1P
Ground 13 14 Ground
D2N 15 16 D2P
Ground 17 18 Ground
D3N 19 20 D3P
Ground 21 22 Ground
D4N 23 24 D4P
Ground 25 26 Ground
D5N 27 28 D5P
Ground 29 30 Ground
D6N 31 32 D6P
Ground 33 34 Ground
D7N 35 36 D7P
Ground 37 38 Ground
D8N 39 40 D8P
Ground 41 42 Ground
D9N 43 44 D9P
Ground 45 46 Ground
D10N 47 48 D10P
Ground 49 50 Ground
D11N 51 52 D11P
Ground 53 54 Ground
D12N 55 56 D12P
Ground 57 58 Ground
D13N 59 60 D13P
Ground 61 62 Ground
D14N 63 64 D14P
Ground 65 66 Ground
Pin
Number
Pin
Number
Signal
21
Chapter 2: Mechanical Considerations
E5378A and E5379A Probe Specifications
E5379A 100-pin Differential Probe Connector
Pin Assignments
Signal
D15N 67 68 D15P
Ground 69 70 Ground
NC 71 72 NC
Ground 73 74 Ground
NC 75 76 NC
Ground 77 78 Ground
D16N/CLKN 79 80 D16P/CLKP
Ground 81 82 Ground
NC 83 84 NC
Ground 85 86 Ground
NC 87 88 NC
Ground 89 90 Ground
NC 91 92 NC
Ground 93 94 Ground
Ground 95 96 Ground
NC 97 98 NC
NC 99 100 NC
Ground pins indicated in this table are grounded in the probe. Grounding of specific
ground pins on the target board is optional. However, the following guidelines
should be observed:
Pin
Number
Pin
Number
Signal
1) Multiple ground returns are desirable to maintain signal integrity. As many probe
ground pins as possible should be connected to ground in the target system board.
2) The ground pins located between signal pins are particularly important because
they provide improved signal-to-signal isolation. This is particularly important for
differential inputs. Excessive coupling between differential inputs causes the
apparent input capacitance to increase. Capacitance between the two sides of a
differential signal will appear to each side as approximately twice the capacitance to
ground, because the capacitance is connected to a signal of opposite polarity. The
best practice is to ground as many of these pins on the target board as possible.
22
Chapter 2: Mechanical Considerations
E5380A 38-pin Single-ended Probe
E5380A 38-pin Single-ended Probe
The E5380A probe is compatible with target systems designed for the Agilent
E5346A 38-pin probe. This probe requires a probe kit that contains MICTOR
connectors and shrouds. Refer to the table in Chapter 6 for the kit part numbers.
38-pin MICTOR connector footprint and support shroud mounting hole
dimensions.
23
Chapter 2: Mechanical Considerations
E5380A 38-pin Single-ended Probe
MICTOR connector dimensions
Support shroud dimensions for the MICTOR connector
24
Chapter 2: Mechanical Considerations
E5380A 38-pin Single-ended Probe
E5380A 38-pin single-ended probe dimensions
25
Chapter 2: Mechanical Considerations
E5380A 38-pin Single-ended Probe
E5380A 38-pin Single-ended Probe Pin Assignments
AMP Mictor-38 Connector Logic Analyzer Pods
Signal Name Pin Number J1 (Even Pod) J2 (Odd Pod)
CLOCK even 5 3
D15 even 7 7
D14 even 9 9
D13 even 11 11
D12 even 13 13
D11 even 15 15
D10 even 17 17
D9 even 19 19
D8 even 21 21
D7 even 23 23
D6 even 25 25
D5 even 27 27
D4 even 29 29
D3 even 31 31
D2 even 33 33
D1 even 35 35
D0 even 37 37
CLOCK odd 6 3
D15 odd 8 7
D14 odd 10 9
D13 odd 12 11
D12 odd 14 13
D11 odd 16 15
D10 odd 18 17
D9 odd 20 19
D8 odd 22 21
D7 odd 24 23
D6 odd 26 25
D5 odd 28 27
D4 odd 30 29
D3 odd 32 31
D2 odd 34 33
D1 odd 36 35
D0 odd 38 37
26
Chapter 2: Mechanical Considerations
E5380A 38-pin Single-ended Probe
E5380A 38-pin Single-ended Probe Pin Assignments
AMP Mictor-38 Connector Logic Analyzer Pods
Signal Name Pin Number J1 (Even Pod) J2 (Odd Pod)
GROUND 39-43 All even pins All even pins
Do not connect the following pins. These pins are +5 volt supply and DC return
for analysis probes.
+5 VDC 1 1, 39 1, 39
GROUND 3 2, 40 2, 40
Do not connect the following pins. They are used by the Agilent logic analyzer
with an emulator or analysis probe to program or read target information.
SCL 2 5
SDA 4 5
27
Chapter 2: Mechanical Considerations
E5386A Half-channel Adapter
E5386A Half-channel Adapter
The E5386A Half-channel Adapter works with the E5378A 100-pin Single-ended
Probe and the E5379A 100-pin Differential Probe.
Half-channel adapter dimensions.
28
Chapter 2: Mechanical Considerations
Signal Name
E5386A Half-channel Adapter
Used with E5378A 100-pin Single-ended Probe
When used with the E5378A 100-pin Single-ended Probe, you need two halfchannel adapters, one adapter for Odd data and one for Even data. The table below
shows the pin assignments.
E5386A Adapter #1
Logic Analyzer
Signal Name Pod
Odd D0 7 Pod 2 0 Evn D0 8 Pod 2 0
Odd D1 11 Pod 2 2 Evn D1 12 Pod 2 2
Odd D2 15 Pod 2 4 Evn D2 16 Pod 2 4
Odd D3 19 Pod 2 6 Evn D3 20 Pod 2 6
Odd D4 23 Pod 2 8 Evn D4 24 Pod 2 8
Odd D5 27 Pod 2 10 Evn D5 28 Pod 2 10
Odd D6 31 Pod 2 12 Evn D6 32 Pod 2 12
Odd D7 35 Pod 2 14 Evn D7 36 Pod 2 14
Odd D8 39 Pod 1 0 Evn D8 40 Pod 1 0
Odd D9 43 Pod 1 2 Evn D9 44 Pod 1 2
Odd D10 47 Pod 1 4 Evn D10 48 Pod 1 4
Odd D11 51 Pod 1 6 Evn D11 52 Pod 1 6
Odd D12 55 Pod 1 8 Evn D12 56 Pod 1 8
Odd D13 59 Pod 1 10 Evn D13 60 Pod 1 10
Odd D14 63 Pod 1 12 Evn D14 64 Pod 1 12
Odd D15 67 Pod 1 14 Evn D15 68 Pod 1 14
Odd D16P/ClkP 79 Pod 1 Evn D16P/ClkP 79 Pod 1
Odd D16N/ClkN 83 Pod 1 Evn D16N/ClkN 83 Pod 1
Odd Ext Ref 87 Evn Ext Ref 87
Pin No. Chan No.
Pod 1&2 Ext Ref
Chan No
JCLK P
JCLK N
E5386A Adapter #2
Logic AnalyzerE5378A ProbeE5378A Probe
Pin No.
Pod
Pod 1&2 Ext Ref
JCLK P
JCLK N
29
Chapter 2: Mechanical Considerations
Logic Analyzer
E5386A Half-channel Adapter
Used with E5379A 100-pin Differential Probe
When used with the E5378A 100-pin Differential Probe, you need only one halfchannel adapter. The table below shows the pin assignments.
E5386A Adapter
E5379A Connector
Signal Name Signal Name Pod
D0n 7 D0p 8 Pod 2 0
D1n 11 D1p 12 Pod 2 2
D2n 15 D2p 16 Pod 2 4
D3n 19 D3p 20 Pod 2 6
D4n 23 D4p 24 Pod 2 8
D5n 27 D5p 28 Pod 2 10
D6n 31 D6p 32 Pod 2 12
D7n 35 D7p 36 Pod 2 14
D8n 39 D8p 40 Pod 1 0
D9n 43 D9p 44 Pod 1 2
D10n 47 D10p 48 Pod 1 4
D11n 51 D11p 52 Pod 1 6
D12n 55 D12p 56 Pod 1 8
D13n 59 D13p 60 Pod 1 10
D14n 63 D14p 64 Pod 1 12
D15n 67 D15p 68 Pod 1 14
Pin No. Pin No.
Chan No.
D16n/ClkN 79 D16p/ClkP 79 Pod 1 JCLKP
30
3
Electrical Considerations
Electrical considerations such as equivalent probe loads.
31
Chapter 3: Electrical Considerations
Equivalent Probe Loads
Equivalent Probe Loads
The equivalent probe loads for the E5378A, E5379A, and E5380A probes are shown
in the figures below. The equivalent loads include the 100-pin Samtec or 38-pin
MICTOR connector.
E5378A and E5379A Models
The following simple model is accurate up to 1 GHz. Transient analysis with Spice
is fastest with this model.
150
1.6 pF
0.7 pF
20K
+0.75V
The following transmission line model is the most accurate. It is accurate up to 5
GHz. Transient analysis with Spice will be the slowest with this model.
TConnector
Z0=47
Td=75ps
150
0.7 pF
20K
+0.75V
32
Chapter 3: Electrical Considerations
Equivalent Probe Loads
The following lumped LC transmission line model is identical to the transmission
line, but provides faster transient analysis.
1.17nH 1.17nH1.17nH
0.27 pF
0.53 pF
0.53 pF
0.27 pF
150
0.7 pF
20K
+0.75V
E5380A Model
The following equivalent probe load for the E5380A includes the target connector.
The model is accurate up to 1 GHz .
180
3 pF
20K
+0.75V
0.7 pF
33
Chapter 3: Electrical Considerations
Equivalent Probe Loads
34
4
Circuit Board Design
Design considerations.
35
Chapter 4: Circuit Board Design
Transmission Line Considerations
Transmission Line Considerations
Stubs connecting signal transmission lines to the connector should be as short as
feasible. Longer stubs will cause more loading and reflections on a transmission
line. If the electrical length of a stub is less than 1/5 of the signal rise time, it can be
modeled as a lumped capacitance. Longer stubs must be treated as transmission
lines.
([DPSOH Assume you are using FR-4 PC board material with a dielectric constant of ~4.3 for
inner-layer traces (microstrip). For example, A 0.28 cm long stub in an inner layer
has a propagation delay of ~20 ps. Therefore, for a signal with a rise time of 100 ps
or greater, a 0.28 cm stub will behave like a capacitor.
The trace capacitance per unit length will depend on the trace width and the spacing
to ground or power planes. If the trace is laid out to have a characteristic impedance
of 50 ohms, it turns out that the capacitance per unit length is ~ 1.2 pF/cm. Therefore
the 0.28 cm stub in the previous example would have an effective capacitance equal
to ~0.34 pF.
This trace capacitance is in addition to the probe load model.
36
Chapter 4: Circuit Board Design
Thresholds
Thresholds
E5378A 100-pin single-ended probe
Data inputs
The E5378A 100-pin single-ended probe has two inputs for a user-supplied
threshold voltage for the data inputs, one for the even pod and one for the odd pod.
The threshold inputs (pins 87 and 88) may be grounded, left open, or connected to a
dc power supply. For each group of data inputs, you may either:
• Supply a threshold voltage between -3V dc and +5V dc to the threshold input.
The logic analyzer will use this threshold to determine when the signal is high or
low.
Or
• Adjust the logic threshold in the user interface to between -3V dc and +5V dc.
The advantages of supplying a threshold voltage via the threshold input on the probe
are:
• A threshold supplied from the source will typically track changes in supply
voltage, temperature, etc.
• A threshold supplied from the target is typically the same threshold that the
target system's logic uses to evaluate the signals. Therefore the data captured by
the logic analyzer will be congruent with the data as interpreted by the target
system.
Clock input
The clock input to the E5378A probe is differential. If you supply a differential
clock, you should select the "differential" option in the clock threshold user
interface.
If your system uses a single-ended clock signal, the clock
grounded or connected to a dc power supply. You may:
37
input should be either
Chapter 4: Circuit Board Design
Thresholds
• Ground the clock input and adjust the clock threshold from the user interface to
between -3V dc and +5V dc.
Or
• Supply a threshold reference voltage between -3V dc and +5V dc to the clock
input.
If your circuit uses a resistive divider to provide a threshold reference, be sure to
consider the equivalent circuit consisting of the 20k
as shown on page 32 and 33.
The threshold for the clock input has a separate adjustment in the user interface,
independent of the data inputs.
Ω resistor connected to +0.75V
E5379A 100-pin differential probe
Data inputs
If you are using the E5379A 100-pin differential probe to acquire differential
signals, you would normally allow the logic analyzer to discriminate between high
and low states based on the crossover of the data and data
You may also use the E5379A 100-pin differential probe to acquire single-ended
signals. If you are using the E5379A probe to acquire single-ended signals, you
should either ground the data
• Ground the data
Or
• Supply a threshold reference voltage to the data
inputs and adjust the threshold in the user interface.
inputs or connect them to a dc power supply. You may:
inputs.
inputs.
If your circuit uses a resistive divider to provide a threshold reference, be sure to
consider the equivalent circuit consisting of the 20k
as shown on page 32 and 33.
Ω resistor connected to +0.75V
Clock input
The same choices exist for the clock input on the E5379A 100-pin differential probe
as outlined above for the data inputs. The clock input has a separate, independent
threshold adjustment.
38
Chapter 4: Circuit Board Design
Thresholds
E5380A 38-pin single-ended probe
All inputs on the E5380A 38-pin probe are single-ended. The E5380A probe does
not have a threshold reference input. When you use the E5380A, you adjust the logic
threshold in the user interface.
The clock input on the E5380A is single-ended. The clock threshold may be
adjusted independent of the data.
Signal Access
Labels split across probes
If a label is split across more than one pod, this leads to restrictions in triggering.
Refer to "Triggering with the Agilent 16760A" for more details.
Reordered bits
If bits need to be reordered within a label, this leads to additional restrictions in
triggering. Specifically, equalities can be used to evaluate the value of a label with
reordered bits, but inequalities cannot be used. You may be able to avoid the need to
reorder bits in a label by routing signals to appropriate pins on the probe connector.
39
Chapter 4: Circuit Board Design
Thresholds
Half-channel 1.5 Gb/s mode
In the half-channel 1.5 Gb/s mode, the analyzer accesses only the even channels
(0,2,4, etc.). In the Format user interface, the connections within a pod (16-signal
group) are mapped as follows:
Connector
pins
7,8 D0 Bit0
15,16 D2 Bit1
23,24 D4 Bit2
31,32 D6 Bit3
39,40 D8 Bit4
47,48 D10 Bit5
55,56 D12 Bit6
63,64 D14 Bit7
Note that in the 1.5 Gb/s half-channel mode, the clock inputs cannot be assigned as
bits in a label.
Connection name in this
document (pages 19- 22)
Reference in format
window
E5386A Half-channel Adapter. The E5386A can be used with the E5378A
100-pin Single-ended Probe or the E5379A 100-pin Differential Probe to map the
signals from the 100-pin Samtec connector to the 16760A when operating in halfchannel state mode.
40
5
Recommended Reading
A list of recommended reading for more information about systems and high-speed
digital design.
41
Chapter 5: Recommended Reading
For More Information
For More Information
MECL System Design Handbook
Blood, William R. Jr., "MECL System Design Handbook," 4th edition, 1988,
published by Motorola. This handbook can be obtained from ON Semiconductor on
the web. Go to <http://onsemi.com>. Click on "On-line ordering" under
"Documentation." Click on the link "General search." Type in "HB205" in the
"Document number" field. Click "Submit." To view the document online, click on
"PDF" in the right-hand column titled "PDF MFAX." Or order a hardcopy of the
handbook on-line.
High-speed Digital Design
Johnson, Howard W., and Martin Graham, "High-speed Digital Design," PrenticeHall, 1993, ISBN 0-13-395724-1
Designing High-speed Target Systems for Logic Analyzer Probing
“Designing High-speed Target Systems for Logic Analyzer Probing” Agilent
Technologies application note publication number 5988-2989EN.
42
6
Connectors and Shrouds
A table of part numbers for ordering connectors, shrouds, and kits.
43
Chapter 6: Connectors and Shrouds
Ordering Probing Connectors and Shrouds
Ordering Probing Connectors and Shrouds
Connectors and shrouds may be ordered in kits or ordered separately. Select a
support shroud appropriate for the thickness of your PC board. The following table
lists the Agilent part numbers for each.
CAUTION: The support shrouds marked with an asterisk in the following table are made of
conductive metal. Care should be taken to avoid shorting adjacent boards or
components with the shrouds. For this reason it may be advisable not to connect the
shrouds to ground.
For Probe
Model #
E5378A &
E5379A
E5380A E5346-68701 5 MICTOR Connectors
Agilent Part Number Consists of
16760-68702 5 Mating Connectors &
16760-68703 up to 3.05 mm (0.120 in.)
1253-3620 (or Samtec
#ASP-65067-01)
16760-02302 1 Support Shroud* up to 1.57 mm (0.062 in.)
16760-02303 1 Support Shroud* up to 3.05 mm (0.120 in.)
E5346-68700 5 MICTOR Connectors
1252-7431 1 MICTOR Connector n/a
AMP part #2-767004-2 1 MICTOR Connector n/a
E5346-44701 1 Support Shroud up to 1.57 mm (0.062”)
E5346-44704 1 Support Shroud 1.575 to 3.175 mm
E5346-44703 1 Support Shroud 3.175 to 4.318 mm
5 Support Shrouds*
1 100-pin Mating Connector n/a
& 5 Support Shrouds
& 5 Support Shrouds
For Target PC Board
Thickness
up to 1.57 mm (0.062 in.)
up to 1.57 mm (0.062 in.)
1.575 to 3.175 mm
(0.062 to 0.125 in.)
(0.062 to 0.125 in.)
(0.125 to 0.70 in.)
44
Index
A
adapter, E5386A half-channel
C
circuit board design
connector part numbers
connector specifications
E5378A 100-pin single-ended
E5379A 100-pin differential
E5380A 38-pin single-ended
E5386A Half-channel Adapter, 28
D
design theory
differential input amplitude
differential probe
dimensions
100-pin differential probe
100-pin single-ended probe
38-pin MICTOR connector
38-pin single-ended probe
half-channel adapter
MICTOR connector, 24
MICTOR support shroud
Samtec connector
Samtec connector footprint, 16
Samtec support shroud
E
E5378A 100-pin single-ended
E5379A 100-pin differential
E5380A 100-pin single-ended
E5386A half-channel adapter
, 16
probe
, 16
probe
, 23
probe
definition
footprint
probe
, 10
, 11
probe
, 12
probe
, 35
, 35
, 11
, 11
, 23
, 17
, 13
, 43
, 18
, 18
, 25
, 28
, 24
, 17
, 13
electrical considerations
equivalent probe loads
H
half-channel adapter
half-channel mode
M
mechanical considerations
MICTOR
connector
support shroud
O
ordering parts
P
pinout
E5378A 100-pin single-ended
E5379A 100-pin differential
E5380A 38-pin single-ended
E5386A used with E5379A
E5386A used with E6378A, 29
probe
E5378A 100-pin
E5379A 100-pin differential
E5380A 100-pin single-ended
E5380A 38-pin single-ended, 3, 23
probing options
R
recommended reading
S
Samtec
compatible probes
, 23
, 44
probe, 19
, 21
probe
, 26
probe
single-ended
, 9
, 31
, 32
, 2, 3, 13, 28
, 40
, 15
, 24
, 30
, 2, 10
, 3, 11
, 41
, 16
, 12
connector, 16, 17
support shroud
shroud part numbers
signal access
single-ended probe, 100-pin
single-ended probe, 38-pin
specifications
E5378A 100-pin single-ended
probe
E5379A 100-pin differential
probe
E5380A 38-pin single-ended
probe
E5386A Half-channel Adapter
T
thresholds
transmission line considerations
, 17
, 43
, 39
, 10
, 12
, 16
, 16
, 23
, 37
, 28
, 36
45
Index
46
Safety
Notices
This apparatus has been
designed and tested in accordance with IEC Publication 1010,
Safety Requirements for Measuring Apparatus, and has been
supplied in a safe condition.
This is a Safety Class I instrument (provided with terminal for
protective earthing). Before
applying power, verify that the
correct safety precautions are
taken (see the following warnings). In addition, note the
external markings on the instrument that are described under
"Safety Symbols."
Warnings
• Before turning on the instrument, you must connect the protective earth terminal of the
instrument to the protective conductor of the (mains) power
cord. The mains plug shall only
be inserted in a socket outlet
provided with a protective earth
contact. You must not negate
the protective action by using an
extension cord (power cable)
without a protective conductor
(grounding). Grounding one
conductor of a two-conductor
outlet is not sufficient protection.
• Only fuses with the required
rated current, voltage, and specified type (normal blow, time
delay, etc.) should be used. Do
not use repaired fuses or shortcircuited fuseholders. To do so
could cause a shock or fire hazard.
• If you energize this instrument
by an auto transformer (for voltage reduction or mains isolation), the common terminal must
be connected to the earth terminal of the power source.
• Whenever it is likely that the
ground protection is impaired,
you must make the instrument
inoperative and secure it against
any unintended operation.
• Service instructions are for
trained service personnel. To
avoid dangerous electric shock,
do not perform any service
unless qualified to do so. Do not
attempt internal service or
adjustment unless another person, capable of rendering first
aid and resuscitation, is present.
• Do not install substitute parts
or perform any unauthorized
modification to the instrument.
• Capacitors inside the instrument may retain a charge even if
the instrument is disconnected
from its source of supply.
• Do not operate the instrument
in the presence of flammable
gasses or fumes. Operation of
any electrical instrument in such
an environment constitutes a
definite safety hazard.
• Do not use the instrument in a
manner not specified by the
manufacturer.
To clean the instrument
If the instrument requires cleaning: (1) Remove power from the
instrument. (2) Clean the external surfaces of the instrument
with a soft cloth dampened with
a mixture of mild detergent and
water. (3) Make sure that the
instrument is completely dry
before reconnecting it to a
power source.
Safety Symbols
!
Instruction manual symbol: the
product is marked with this symbol when it is necessary for you
to refer to the instruction manual in order to protect against
damage to the product..
Hazardous voltage symbol.
Earth terminal symbol: Used to
indicate a circuit common connected to grounded chassis.
Agilent Technologies Inc.
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1900 Garden of the Gods Road
Colorado Springs, CO 80901-2197, U.S.A.
Notices
© Agilent Technologies, Inc. 20012002
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by United States and international copyright laws.
Manual Part Number
16760-97007, February 2002
Print History
16760-97005, January 2002
16760-97003, May 2001
16760-97002, April 2001
16760-97001, February 2001
16760-97000, December 2000
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