Squire Probe Adapter

Data Sheet&

Users Manual

January 2009 - Rev 1.2

Squire Probe Adapter

1.0 General:The Squire Probe Adapter is used to connect a Tektronix P64341 logic analyzer probe to a Tektronix TLA logic analyzer module that uses high-density front panel connectors (eg TLA7AA4, TLA7BB4). It has been optimized to work well with high level logic signals such as TTL and LVCMOS. It will not work well with signals with low swings (like doubly-terminated SSTL-2 1.5 volt)

The Squire amplifies and buffers the 34 channels of the Probe for use with the logic analyzer module. A proprietary autocal scheme ensures offset voltages are tightly controlled. The output of the Squire is analog; thresholding is performed in the logic analyzer as it would be in the case of a Probe without a Squire adapter.

2.0 RequirementsP6434 probe or similar and TLA module (TLA7AAx or TLA7BBx)

3.0 Usage

CAUTION: once the Squire is attached to the Logic Analyzer, it forms a significant lever arm. Take great care to make sure no weight is placed on the Squire. Costly damage to the logic analyzer can occur if a user places any weight on the Squire. Do not lift or move the logic analyzer by using the Squire as a “handle” or grab point.

For high-edge rate signals, we recommend setting the logic analyzer threshold to the center of the swing to avoid minor glitches undershoots and overshoots cause on the logic analyzer display. For example, for a signal rising at faster than 0.5V/nS and swinging from 0 to 3.3 volts, we recommend the user set the threshold on the logic analyzer to 1.70 volts. Settings more than 0.7 volts below or above this level may result in glitches being detected.

1 and others, P6417, P6418, P6419

3.1 Labels

Locations are illustrated below.

TLA Connector

E0 E1 Q2

PROBE CONNECTIONOBSERVE POLARITY

BOTTOM VIEW

Squire Adapter

The Moving Pixel Companywww.movingpixel.com

E0 E1 Q2 E2 E3 Q3

TLA CONNECTIONOBSERVE POLARITY

DO NOT OVERTIGHTEN SCREWS !!!

TLA Connector

E2 E3 Q3

PROBE CONNECTIONOBSERVE POLARITY

TOP VIEWwhen installed in TLA

CAL

Apply labels as shown in the following table. The preferred labeling is show first, followed by the most likely legacy labeling. Note that some remapping of the logic analyzer is required for legacy labeling.

For a P6434 probe:Probe high side refers to the TLA cable/connector from the pin 1 side of the Mictor.Probe low side refers to the TLA cable/connector from the pin 38 side of the Mictor.

Mictor Pin 1 side (HIGH)

Mictor Pin 38 side (LOW )

note orientation of ground contact

Probe LabelsPreferred

Squire Labels TLA

LOW HIGH Bottom Top TLA Connector

Remapping

E0 E1 Q2 E2 E3 Q3 E0 E1 Q2 E2 E3 Q3 E0 E1 Q2E2 E3 Q3

none

D2 D3 Q0 A2 A3 CK0 D2 D3 Q0 A2 A3 CK0 D2 D3 Q0A2 A3 CK0

none

D0 D1 CK2 A0 A1 CK1 D0 D1 CK2 A0 A1 CK1 D0 D1 CK2A0 A1 CK1

none

C0 C1 Q1 C2 C3 CK3 C0 C1 Q1 C2 C3 CK3 C0 C1 Q1C2 C3 CK3

none

Probe LabelsLegacy

Squire Labels TLA

LOW HIGH Bottom Top TLA Connector

Remapping

D0 D1 CK2 D2 D3 Q0 D0 D1 CK2 A0 A1 CK1 D0 D1 CK2A0 A1 CK1

A0 = D2, A1 = D3, CK1 = Q0

C0 C1 Q1 C2 C3 CK3 C0 C1 Q1 C2 C3 CK3 C0 C1 Q1C2 C3 CK3

none

A0 A1 CK1 A2 A3 CK0 D2 D3 Q0 A2 A3 CK0 D2 D3 Q0A2 A3 CK0

D2 = A0, D3 = A1, q0 = CK1

E0 E1 Q2 E2 E3 Q3 E0 E1 Q2 E2 E3 Q3 E0 E1 Q2E2 E3 Q3

none

Once labels are applied, connect the Squire adapter to the TLA connector indicated by the Squire label. Be careful not to over tighten the screws. We have found that the probe labels are better protected and last a bit longer if the user puts some clear tape over them.

Connect the Probe connectors to the Squire, taking care to insert the Probe connector into the appropriate connector based on the labeling and watching the connector keying.

Connect the user end of the Probe to the system under test as shown below

unit under test

Probe Assembly

Squireprobe

adapter

TLAModule

Set the TLA logic thresholds based on the expected UUT signal voltages and the signal path gain of the combined Probe / Squire adapter.

ProbeSquire Probe

AdapterTLA ModuleUUT

0

1V

0

3.7mV

0

52 mV

Gain = 1/267.7Offset = 0

Gain = 14Offset = 0

Signal Path Gains / Offsets

0 – 1V input is an example.Allowed input range is +5 to -2.5 V

End to end gain is nominally 0.052, End to end offset is nominally 0 volts

For the 0 – 1V signal used as an example the TLA threshold should be set to 500 mV (internally the TLA makes 25 mV as the threshold).

The probe end of the Squire Adapter is shown below

top when installed in TLA

bottom LED2LED 1

3.2 Controls and Indicators

There are two LED indicators labeled led 1 and led 2 (see drawing above) and a CAL switch (see section 3.1).

At power up, both leds blink a few times to let the user know they are operational.

LED2 is a heartbeat LED to let you know that the unit is functioning. It blinks all the time except during calibration.

The CAL switch is used to recalibrate DC offsets in the Squire adapter. The Squire is pre-calibrated at the factory. However, we recommend that the user recalibrate whenever the probe adapter is attached to a logic analyzer module or moved between logic analyzer connectors. Best results will be had if the logic analyzer and the probe adapter have both reached power-on thermal equilibrium, at least 10 minutes.

The reason to calibrate the probe is so that the threshold between a one and zero does not drift around, changing timing and waveshape relationships at the logic analyzer. Calibration is more important with slow edges and low amplitude signals.

To perform a calibration, use the following procedure.

1. Allow the Squire to come to temperature equilibrium (10 minutes or more)2. Disconnect the Probe from the Squire.3. Push and hold the CAL button until LED1 lights (approx 1 second). 4. LED1 will go out when the calibration is complete (about 5 seconds)

4.0 Specifications

Characteristic Specification Notes

DC Offset +/- 100mV typicalRisetime ~3nS or faster 20%-80%Data Rate/Bandwidth- Nominal frequency rolloff- -3dB (70.7% amplitude)- -6dB (half-amplitude)

200Mbps/100 MHz400 Mbps/200 MHz600Mbps/300MHz

Worst case, 85% amplitudeTypicalTypical

Gain ~14 Nominal, inconsequential to the user.

Specifications for the supported Tektronix logic analyzer probes can be found on Tek’s website: http://www2.tek.com/cmswpt/psdownload.lotr?ct=PS&cs=psu&ci=13438&lc=ENNote that Squire will support all these probes: P6434, P6410, P6419, and P6430 as well as the legacy P6417 and similar.

http://www2.tek.com/cmswpt/psdownload.lotr?ct=PS&cs=psu&ci=13438&lc=ENhttp://www2.tek.com/cmswpt/psdownload.lotr?ct=PS&cs=psu&ci=13438&lc=EN

Squire Probe Adapter