9

ATF1508ASV(L)

1408H–PLD–7/05

Programming

ATF1508ASV(L) devices are in-system programmable (ISP) devices utilizing the 4-pin

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

gramming and facilitates rapid design iterations and field changes.

Atm e l pro v id es I SP har d wa re a nd sof t war e t o allow pr ogr a mming of t h e

ATF1508ASV(L) via the PC. ISP is performed by using either a download cable, a com-

parable board tester or a simple microprocessor interface.

To allow ISP programming support by the Automated Test Equipment (ATE) vendors,

Serial Vector Format (SVF) files can be created by the Atmel ISP software. Conversion

to other ATE tester format beside SVF is also possible

ATF1508ASV(L) devices can also be programmed using standard third-party program-

mers. With third-party programmer, the JTAG ISP port can be disabled thereby allowing

four additional I/O pins to be used for logic.

Contact your local Atmel representatives or Atmel PLD applications for details.

ISP Programming

Protection

The ATF1508ASV(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/O default to high-Z state during such a condition. In addition the pin-keeper

option preserves the former state during device programming.

All ATF1508ASV(L) devices are initially shipped in the erased state thereby making

them ready to use for ISP.

Note:

For more information refer to the “Designing for In-System Programmability with Atmel

CPLDs” application note.