JAM / STAPL ("Standard Test and Programming Language") is an Altera-developed standard for JTAG in-circuit programming of programmable logic devices (PLDs). It 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.
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