Preprocessor Interface Description - HP 10314D User Manual

Environmental
Temperature:
Altitude:
Humidity:
Preprocessor
Interface
Description
HP 103140
Operating:
0 to
+
55 degrees C
( +
32 to
+
131 degrees F)
Nonoperating:
-40 to
+
75 degrees C
(-40 to
+
167 degrees F)
Operating:
4600
m
(15,000
ft)
Nonoperating: 15,300
m
(50,000 ft)
Up to 90% noncondensing. Avoid sudden, extreme temperature
changes which could cause condensation within the instrument.
The primary function of the HP 103140 Preprocessor Interface is to
connect the target microprocessor to the logic analyzer through the
probe interface, and to perform the interface logic required to identify
address pipelining and 16 or 32-bit cycles. The HP 103140
Preprocessor Interface performs this primary function by:
1. Latching and buffering the address, status, and data bus of the
80386DX microprocessor so that address, status, and data can be
sent to the logic analyzer
at
the same time.
2. Generating the logic analyzer clock from the appropriate
803860X microprocessor signals and bus conditions.
3. Synthesizing address lines AO and Al from the LBEO through
LBE3 lines so that the inverse assembler can identify the address
for AO and Al.
The preprocessor interface duplicates the internal CLK signal of the
803860X by
dividing the CLK2 signal by 2 and selecting the correct
phase of the resulting signal. This signal is called CLK and
is
used to
identify 80386DX activities inside the PAL on the HP 103140.
The J and K clocks for latching information into the logic analyzer are
generated by the PAL on the HP 103140 each time the LREADY
signal goes low.
Figure 3-1 shows a block diagram of the HP 103140 Preprocessor
Interface.
80386DX Preprocessor Interface
General Information
3-3