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EP2C35A15F324C6N Datasheet(PDF) 75 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 75 Page - Altera Corporation |
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75 / 168 page  Altera Corporation 3–1 February 2007 3. Configuration & Testing IEEE Std. 1149.1 (JTAG) Boundary Scan Support All Cyclone® II devices provide JTAG BST circuitry that complies with the IEEE Std. 1149.1. JTAG boundary-scan testing can be performed either before or after, but not during configuration. Cyclone II devices can also use the JTAG port for configuration with the Quartus® II software or hardware using either Jam Files (.jam) or Jam Byte-Code Files (.jbc). Cyclone II devices support IOE I/O standard reconfiguration through the JTAG BST chain. The JTAG chain can update the I/O standard for all input and output pins any time before or during user mode through the CONFIG_IO instruction. You can use this capability for JTAG testing before configuration when some of the Cyclone II pins drive or receive from other devices on the board using voltage-referenced standards. Since the Cyclone II device might not be configured before JTAG testing, the I/O pins may not be configured for appropriate electrical standards for chip-to-chip communication. Programming the I/O standards via JTAG allows you to fully test I/O connections to other devices. f For information on I/O reconfiguration, refer to the MorphIO: An I/O Reconfiguration Solution for Altera Devices White Paper. A device operating in JTAG mode uses four required pins: TDI, TDO, TMS, and TCK. The TCK pin has an internal weak pull-down resister, while the TDI and TMS pins have weak internal pull-up resistors. The TDO output pin and all JTAG input pin voltage is determined by the VCCIO of the bank where it resides. The bank VCCIO selects whether the JTAG inputs are 1.5-, 1.8-, 2.5-, or 3.3-V compatible. 1 Stratix® II, Stratix, Cyclone II and Cyclone devices must be within the first 8 devices in a JTAG chain. All of these devices have the same JTAG controller. If any of the Stratix II, Stratix, Cyclone II or Cyclone devices are in the 9th of further position, they fail configuration. This does not affect Signal Tap II. CII51003-2.2 |
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