isppac20 Lattice Semiconductor Corp., isppac20 Datasheet - Page 26

• Manufacturer Part Number: isppac20
• Description: In-system Programmable Analog Circuit
• Manufacturer: Lattice Semiconductor Corp.

Design Entry Software
Designers configure the ispPAC20 and verify its perfor-
mance using PAC-Designer, an easy to use, Microsoft
Windows compatible program. Circuit designs are en-
tered graphically and then verified, all within the
PAC-Designer environment. Full device programming is
supported using PC parallel port I/O operations and a
download cable connected to the serial programming
interface of the ispPAC20. A library of configurations is
included with basic solutions and examples of advanced
circuit techniques. In addition, comprehensive on-line
and printed documentation is provided that covers all
aspects of PAC-Designer operation.
The PAC-Designer schematic window, shown in Figure
14, provides access to all configurable ispPAC20 ele-
ments via its graphical user interface. All analog input
and output pins are represented. Static or non-config-
urable pins such as power, ground, VREF
serial digital interface are omitted for clarity. Any element
Figure 14. Initial PAC-Designer Schematic Design Entry Screen
Software-Based Design Environment
OUT
, and the
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in the schematic window can be accessed via mouse
operations as well as menu commands. When com-
pleted, configurations can be saved, simulated, and
downloaded to devices.
PAC-Designer operation can be automated and ex-
tended by using custom-designed Visual Basic
that set the interconnections and the parameters of
ispPAC products. These stand-alone programs are called
macros. An example of such a macro is the biquad filter
generator supplied with PAC-Designer. With this macro,
filter parameters such as gain, Q and corner frequency
are input directly and then automatically converted to a
schematic configuration. More information on this and
other topics is included in the on-line documentation as
well as the PAC-Designer Getting Started Manual .
Specifications ispPAC20
®
programs