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Using the "Digital
Port In" Connector
to Select a Sequence
Using the "Digital
Port In" Connector
to Download Data
Chapter 7
Figure 7-7 shows the timing relationship to select a segment sequence.
Figure 7-7. "Digital Port In" Data Timing
The following explains the relationship.
1. The AFG generates an FPPACE* signal after the next segment
sequence has been selected, but before completing its output.
2. The AFG is now ready for a new segment sequence. Set the
FPCLK* line low to select a new segment sequence. If the line
remains high, the AFG re-uses the last selected sequence.
3. The AFG now latches the least significant byte on the FPDxx
(i.e., FPD00 through FPD15) data lines to select a new sequence.
These data lines contain the address of the sequence to be selected.
4. Once the AFG uses the data to select a new sequence, it generates a
new FPPACE* signal and the process completes.
For correct operation, the FPCLK* should occur 150 nS before the next
FPPACE* occurs. The minimum response delay (t
minimum data hold time (t
20 nS; its width depends on the selected sample rate.
To change the sequence, the sequence base memory must be loaded. See
the "WAVSELFP" example program beginning on page 272 to determine
how to load the memory with the sequences.
To download data, ignore the FPPACE* line but provide a FPCLK* for
each data point to de downloaded. The timing relationship between
FPCLK* and FPDDxx is as shown in Figure 7-7, except without the
FPPACE* line. The data format is the same that is used to download
segment data using the
[SOURce:]ARBitrary:DOWNload
). The minimum FPPACE* pulse width (t
s
High Speed Operation
) is 0 as is also the
s
) is
p
command.
279
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