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Acquisition
Data
Description
HP 16528/16538
Programming Reference
4 bytes - Delay for this analyzer (timing only) - Delay at which data was
acquired. Value represents the amount of delay in nanoseconds.
1 byte - Time tags on (state with tagging only) - In state tagging mode, was
the data captured with time tags (value = 1) or state tags (value = 0).
1 byte - Reserved
5 bytes - Demuhiplexing (state only) - For each of the five pods (first byte
is POD 5, fifth byte is POD 1) in a state machine, describes multiplexing
of each of the five pods. (0 = NO DEMUX, 1 = TRUE DEMUX, 2 =
MIXED CLOCKS).
1 byte - Reserved
20 bytes - Trace point adjustment for pods - Each pod uses 4 bytes to
show the number of nanoseconds that are to be subtracted from the trace
point described above to get the actual trace point value. The first 4 bytes
are for Pod 5, the next four are for Pod 4, and so on.
10 bytes - Reserved
The next 78 bytes are for Analyzer 2 Data Information. They are
organized in the same manner as Analyzer 1 above, but they occupy bytes
99 through 176
The acquisition data section consists of 14336 bytes (1024 1Cbyte groups),
appearing in bytes 177 through 14512. The last ten bytes (14513 through
14522) are reserved. The data contained in the data section will appear in
one of four forms depending on the mode in which it was acquired (as
indicated in byte 21 for machine 1 and byte 99 for machine 2). The four
modes are:
State Data (without tags)
l
State Data (with either time or state tags)
l
Glitch Tiig Data
l
Transitional Timing Data
l
The following four sections describe the four data modes that may be
encountered. Each section describes the Status bytes (shown under the
Machine 1 and Machine 2 headings), and the Information bytes (shown
under the Pod 5 through Pod 1 headings).
DATA
System Commands
611
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