JTAG chain

One or more devices through which programming and/or configuration data are passed from device to device via the Joint Test Action Group (JTAG) Boundary-Scan Test (BST) circuitry. A JTAG chain can consist of only one device.

In JTAG mode, the Quartus^® II Programmer can program or configure all Altera^® devices supported by the Quartus II software, except FLEX^® 6000 devices. FLEX 6000 devices can be in a JTAG chain, but they must be bypassed; they cannot be configured. The Quartus II Programmer can also program EPC2, EPC4, EPC8, and EPC16 configuration devices in JTAG mode. The JTAG chain can contain any number and combination of Altera and non-Altera devices that comply with the IEEE 1149.1 JTAG specification.