Standard Test and Programming Language

JAM / STAPL ("Standard Test and Programming Language") is an Altera-developed standard for JTAG in-circuit programming of programmable logic devices which is defined by JEDEC standard JESD-71.

STAPL defines a standard .jam file format which supports in-system programmability or configuration of programmable devices. A JTAG device programmer implements a JAM player which reads the file as a set of instructions directing it to program a PLD.

The standard is supported by multiple PLD and device programmer manufacturers.