Tektronix Socket 7 TMS109A, Instruction Manual

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Getting Started
1–6
TMS 109A Socket 7 Microprocessor Support
When the jumper is open (not connected), the Socket 7 support acquires the D/P#
signal from an external source, and you will have to route the D/P# signal to pin
1 of this jumper externally. This allows you to probe your system from the dual
socket as long as the D/P# signal is accessible on the system under test.
The Tracking jumper J920 on the probe adapter (see Figure 1–1) does not need to
be moved from the default position (pins 1–2 connected).
The only time this jumper should be moved is when the tracking circuitry
malfunctions. An indication of such a malfunction is when you see activity on
the bus during a BOFF or HLDA cycle that is uncharacteristic of the Socket 7
microprocessor. When the jumper is in the 2–3 position, the circuitry on the
probe adapter does not track BOFF and HLDA cycles. A data sample will show
that such a cycle occurred, but it will not contain meaningful information.
When the Address Synthesis jumper (J921 on the probe adapter) is in position
1–2, A(2:0) is derived from the BE(7:0)# signals and stored in the acquisition
memory with the rest of the address.
When the jumper is in position 2–3, it disables address synthesis, A(2:0)=0.
Figure 1–1 shows the location of J921 on the probe adapter.
Connecting to a System Under Test
Before you connect to the system under test, you must connect the probes to the
module. Your system under test must also have a minimum amount of clearance
surrounding the microprocessor to accommodate the probe adapter. Refer to the
Specifications chapter in this manual for the required clearances.
To connect the logic analyzer to a system under test using a probe adapter, follow
these steps:
1. Power off your system under test. It is not necessary to power off the logic
analyzer.
CAUTION. To prevent static damage to the microprocessor, the probe adapter, the
probes, and the module, handle in a static-free environment. Static discharge can
damage all the above components.
Always wear a grounding wrist strap or similar device while handling the
microprocessor and probe adapter.
Tracking Jumper
Address Synthesis
Jumper
Connect the P6434 Probes
to the Probe Adapter