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EP1C12F100I7 Datasheet(PDF) 51 Page - Altera Corporation |
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EP1C12F100I7 Datasheet(HTML) 51 Page - Altera Corporation |
51 / 94 page ![]() Altera Corporation 51 Preliminary Information Cyclone FPGA Family Data Sheet A path in which a pin directly drives a register may require a programmable delay to ensure zero hold time, whereas a path in which a pin drives a register through combinatorial logic may not require the delay. Programmable delays decrease input-pin-to-logic-array and IOE input register delays. The Quartus II Compiler can program these delays to automatically minimize setup time while providing a zero hold time. Programmable delays can increase the register-to-pin delays for output registers. Table 12 shows the programmable delays for Cyclone devices. There are two paths in the IOE for a combinatorial input to reach the logic array. Each of the two paths can have a different delay. This allows the designer to adjust delays from the pin to internal LE registers that reside in two different areas of the device. The designer sets the two combinatorial input delays by selecting different delays for two different paths under the Decrease input delay to internal cells logic option in the Quartus II software. When the input signal requires two different delays for the combinatorial input, the input register in the IOE is no longer available. The IOE registers in Cyclone devices share the same source for clear or preset. The designer can program preset or clear for each individual IOE. The designer can also program the registers to power up high or low after configuration is complete. If programmed to power up low, an asynchronous clear can control the registers. If programmed to power up high, an asynchronous preset can control the registers. This feature prevents the inadvertent activation of another device’s active-low input upon power up. If one register in an IOE uses a preset or clear signal then all registers in the IOE must use that same signal if they require preset or clear. Additionally a synchronous reset signal is available to the designer for the IOE registers. External RAM Interfacing Cyclone devices support DDR SDRAM and FCRAM interfaces at up to 133 MHz through dedicated circuitry. Table 12. Cyclone Programmable Delay Chain Programmable Delays Quartus II Logic Option Input pin to logic array delay Decrease input delay to internal cells Input pin to input register delay Decrease input delay to input registers Output pin delay Increase delay to output pin |
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