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EP2C35A15F324C6N Datasheet(PDF) 76 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 76 Page - Altera Corporation |
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76 / 168 page  3–2 Altera Corporation Cyclone II Device Handbook, Volume 1 February 2007 IEEE Std. 1149.1 (JTAG) Boundary Scan Support Cyclone II devices also use the JTAG port to monitor the logic operation of the device with the SignalTap® II embedded logic analyzer. Cyclone II devices support the JTAG instructions shown in Table 3–1. Table 3–1. Cyclone II JTAG Instructions (Part 1 of 2) JTAG Instruction Instruction Code Description SAMPLE/PRELOAD 00 0000 0101 Allows a snapshot of signals at the device pins to be captured and examined during normal device operation, and permits an initial data pattern to be output at the device pins. Also used by the SignalTap II embedded logic analyzer. EXTEST (1) 00 0000 1111 Allows the external circuitry and board-level interconnects to be tested by forcing a test pattern at the output pins and capturing test results at the input pins. BYPASS 11 1111 1111 Places the 1-bit bypass register between the TDI and TDO pins, which allows the BST data to pass synchronously through selected devices to adjacent devices during normal device operation. USERCODE 00 0000 0111 Selects the 32-bit USERCODE register and places it between the TDI and TDO pins, allowing the USERCODE to be serially shifted out of TDO. IDCODE 00 0000 0110 Selects the IDCODE register and places it between TDI and TDO, allowing the IDCODE to be serially shifted out of TDO. HIGHZ (1) 00 0000 1011 Places the 1-bit bypass register between the TDI and TDO pins, which allows the BST data to pass synchronously through selected devices to adjacent devices during normal device operation, while tri-stating all of the I/O pins. CLAMP (1) 00 0000 1010 Places the 1-bit bypass register between the TDI and TDO pins, which allows the BST data to pass synchronously through selected devices to adjacent devices during normal device operation while holding I/O pins to a state defined by the data in the boundary-scan register. ICR instructions Used when configuring a Cyclone II device via the JTAG port with a USB Blaster™, ByteBlaster™ II, MasterBlaster™ or ByteBlasterMV™ download cable, or when using a Jam File or JBC File via an embedded processor. PULSE_NCONFIG 00 0000 0001 Emulates pulsing the nCONFIG pin low to trigger reconfiguration even though the physical pin is unaffected. |
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