isppac20 Lattice Semiconductor Corp., isppac20 Datasheet - Page 27

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

Electronic Security
An electronic security “fuse” (ESF) bit is provided in every
ispPAC20 device to prevent unauthorized readout of the
E
prevents further access to the functional user bits in the
device. This cell can only be erased by reprogramming
the device, so the original configuration can not be
examined once programmed. Usage of this feature is
optional.
Production Programming Support
Once a final configuration is determined, an ASCII format
JEDEC file is created using the PAC-Designer software.
Parts can then be ordered through the usual supply
channels with the user’s specific configuration already
preloaded into the parts. PAC-Designer will also export
an SVF file which can be used with ispVM™ for embed-
ded programming applications. By virtue of its standard
interface, compatibility is maintained with existing pro-
duction programming equipment giving customers a wide
Figure 15. Configuring the ispPAC20 “In-System” from a PC Parallel Port
In-System Programmability
2
CMOS user bit patterns. Once programmed, this cell
PAC-Designer
Software
27
degree of freedom and flexibility in production planning.
Other options exist for production programming, includ-
ing a C-coded library of ispVM functions. Contact
[e-mail] for more details.
Evaluation Fixture
Included in the basic ispPAC20 Design Kit is an engineer-
ing prototype board that is connected to the parallel port
of a PC. It demonstrates proper layout techniques for the
ispPAC20 and can be used in real time to check circuit
operation as part of the design process. Input and output
connections as well as a “breadboard” circuit area are
provided to speed debugging of the circuit.
User Electronic Signature
A user electronic signature (UES) feature is included in
the E
that can be configured by the user to store unique data
such as ID codes, revision numbers or inventory control
data.
ispDownload
Cable (6')
2
memory of the ispPAC20. It contains seven bits
Specifications ispPAC20
4
ispPAC20
Circuitry
System
Device
Other