Rainbow-electronics ATF1504ASVL Manual do Utilizador descarregar pdf (Página 10)

ATF1504ASV(L)

1409H–PLD–09/02

Programming ATF1504ASV(L)devicesare in-system programmable (ISP)devices utilizing the4-pin

JTAG protocol. This capability eliminates package handling normally required for pro-

gramming and facilitates rapid design iterations and field changes.

AtmelprovidesISP hardware and software to allow programming of the

ATF1504ASV(L) via thePC. ISP is performedbyusingeither a download cable,acom-

parable board testerorasimple microprocessor interface.

To facilitate ISP programming by the AutomatedTest Equipment (ATE) vendors. Serial

Vector Format (SVF) filescanbe createdbyAtmelprovidedsoftware utilities.

ATF1504ASV(L)devicescanalsobe programmed using standard third-party program-

mers. With third-party programmerthe JTAG ISP port can be disabledthereby allowing

four additional I/Opinstobe used for logic.

Contact your local AtmelrepresentativesorAtmel PLD applications for details.

ISP Programming

Protection

The ATF1504ASV(L) has a special feature that locks the device and prevents the inputs

and I/O from driving if the programming process is interrupted for any reason. The

inputs and I/Odefault to high-Z state during such a condition. In addition the pin keeper

option preservesthe formerstate during device programming, if this circuit were previ-

ously programmedonthe device. This prevents disturbing the operation of other circuits

in the systemwhile the ATF1504ASV(L)isbeing programmed via ISP.

All ATF1504ASV(L)devicesare initially shippedintheerasedstate thereby making

themready to use for ISP.

Note:Formore information refertothe“Designing for In-System Programmability with Atmel

CPLDs” application note.

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