J2 Jumper And J3 Connector; The State/Timing Jumper (J2); J3 Connector - HP E2444A User Manual

J2 Jumper and

J3 Connector

The State/Timing
Jumper (J2)
J3 Connector
Setting Up the HP E2444A
1-4
There is one jumper and one additional connector on the HP E2444A,
J2 and J3 (see figure 1-1). J2 is the State/Timing jumper. J3 contains
additional signals which can be monitored with the General Purpose
(GP) Probes supplied with your logic analyzer.
The State/Timing jumper allows you to configure the HP E2444A
preprocessor interface for either state or timing analysis. For state
analysis, this jumper must be open (jumper removed); for timing
analysis, the circuit must be closed (jumper installed).
When the J2 jumper is in place (closed), the buffers on the
preprocessor interface are flow-through buffers, adding only minimal
skew to signals. When the jumper is removed, the buffers behave as
latches, which capture and hold data based on the assertion of ADS
and READY.
A31 - 2 and D31 - 0 are latched address and data when the jumper is
open. In State-Per-Clock mode, it is best to close the jumper J2 so that
the buffers are flow through, and all signals sampled are relative to
each other. If you use State-Per-Clock mode with J2 open, valid
address and data appear two states after ADS and READY are
asserted, respectively.
The J3 connector contains the HOLD, INTR, and NMI signals (see
figure 1-1). To view these signals, use the GP probes supplied with
your logic analyzer, and connect these signals to an unused logic
analyzer pod. Note that a signal ground connection is not provided or
required, since the logic analyzer is already grounded when the other
pods are connected.
80386DX/DXL Preprocessor Interface
HP E2444A