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EP2C35A15F324C6N Datasheet(PDF) 79 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 79 Page - Altera Corporation |
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79 / 168 page  Altera Corporation 3–5 February 2007 Cyclone II Device Handbook, Volume 1 Configuration & Testing SignalTap II Embedded Logic Analyzer Cyclone II devices support the SignalTap II embedded logic analyzer, which monitors design operation over a period of time through the IEEE Std. 1149.1 (JTAG) circuitry. You can analyze internal logic at speed without bringing internal signals to the I/O pins. This feature is particularly important for advanced packages, such as FineLine BGA® packages, because it can be difficult to add a connection to a pin during the debugging process after a board is designed and manufactured. f For more information on the SignalTap II, see the Signal Tap chapter of the Quartus II Handbook, Volume 3. Configuration The logic, circuitry, and interconnects in the Cyclone II architecture are configured with CMOS SRAM elements. Altera FPGA devices are reconfigurable and every device is tested with a high coverage production test program so you do not have to perform fault testing and can instead focus on simulation and design verification. Cyclone II devices are configured at system power-up with data stored in an Altera configuration device or provided by a system controller. The Cyclone II device’s optimized interface allows the device to act as controller in an active serial configuration scheme with EPCS serial configuration devices. The serial configuration device can be programmed via SRunner, the ByteBlaster II or USB Blaster download cable, the Altera Programming Unit (APU), or third-party programmers. In addition to EPCS serial configuration devices, Altera offers in-system programmability (ISP)-capable configuration devices that can configure Cyclone II devices via a serial data stream using the Passive serial (PS) configuration mode. The PS interface also enables microprocessors to treat Cyclone II devices as memory and configure them by writing to a virtual memory location, simplifying reconfiguration. After a Cyclone II device has been configured, it can be reconfigured in-circuit by resetting the device and loading new configuration data. Real-time changes can be made during system operation, enabling innovative reconfigurable applications. Operating Modes The Cyclone II architecture uses SRAM configuration elements that require configuration data to be loaded each time the circuit powers up. The process of physically loading the SRAM data into the device is called configuration. During initialization, which occurs immediately after configuration, the device resets registers, enables I/O pins, and begins to operate as a logic device. You can use the 10MHz internal oscillator or the optional CLKUSR pin during the initialization. The 10 MHz internal oscillator is disabled in user mode. Together, the configuration and initialization processes are called command mode. Normal device operation is called user mode. |
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