1. Joint Test Action Group body, electronics, integrated circuit, standards, testing> JTAG, or "IEEE Standard 1149. 1" A standard specifying how to control and monitor the pins of compliant devices on a printed circuit board. Each device has four JTAG control lines. There is a common reset TRST and clock TCLK. The data line daisy chains one devices TDO pin to the TDI pin on the next device. The protocol contains commands to read and set the values of the pins and, optionally internal registers of devices. This is called "boundary scanning". The protocol makes board testing easier as signals that are not visible at the board connector may be read and set. The protocol also allows the testing of equipment, connected to the JTAG port, to identify components on the board by reading the device identification register and to control and monitor the devices outputs. JTAG is not used during normal operation of a board. JTAG Technologies B. V. http://www. jtag. com/. Boundary Scan/JTAG Technical Information - Xilinx, Inc. http://www. xilinx. com/support/techsup/journals/jtag/. Java API for Boundary Scan FAQs - Xilinx Inc. http://www. xilinx. com/products/software/sx/sxfaqs. htm. JTAG Boundary-Scan Test Products - Corelis, Inc. http://www. corelis. com/products/scanovrv. html. "Logic analyzers stamping out bugs at the cutting edge", EDN Access, 1997-04-10 http://www. ednmag. com/ednmag/reg/1997/041097/08df_02. htm. IEEE 1149. 1 Device Architecture - Boundary-Scan Tutorial from ASSET InterTech, Inc. http://www. asset-intertech. com/tutorial/arch. htm. "Application-Specific Integrated Circuits", Michael John Sebatian Smith, published Addison-Wesley - Design Automation Cafe http://www. dacafe. com/DACafe/EDATools/EDAbooks/ASIC/Book/CH14 Software Debug options on ASIC cores - Embedded Systems Programming Archive http://embedded. com/97/feat9701. htm. Designing for On-Board Programming Using the IEEE 1149. 1 JTAG Access Port - Intel http://developer. intel. com/design/flcomp/applnots/292186. htm Built-In Self-Test Using Boundary Scan by Texas Instruments - EDTN Network http://www. edtn. com/scribe/reference/appnotes/md003e9a. htm.
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