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EP1C12F100I7 Datasheet(PDF) 42 Page - Altera Corporation |
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EP1C12F100I7 Datasheet(HTML) 42 Page - Altera Corporation |
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42 / 94 page  42 Altera Corporation Cyclone FPGA Family Data Sheet Preliminary Information The external clock outputs do not have their own VCC and ground voltage supplies. Therefore, to minimize jitter, do not place switching I/O pins next to these output pins. The EP1C3 device in the 100-pin TQFP package does not have dedicated clock output pins. The EP1C6 device in the 144-pin TQFP package only supports dedicated clock outputs from PLL 1. Clock Feedback Cyclone PLLs have three modes for multiplication and/or phase shifting: ■ Zero delay buffer mode The external clock output pin is phase- aligned with the clock input pin for zero delay. ■ Normal mode If the design uses an internal PLL clock output, the normal mode compensates for the internal clock delay from the input clock pin to the IOE registers. The external clock output pin is phase shifted with respect to the clock input pin if connected in this mode. The designer defines which internal clock output from the PLL should be phase-aligned to compensate for internal clock delay. ■ No compensation mode In this mode, the PLL will not compensate for any clock networks. Phase Shifting Cyclone PLLs have an advanced clock shift capability that enables programmable phase shifts. Designers can enter a phase shift (in degrees or time units) for each PLL clock output port or for all outputs together in one shift. Designers can perform phase shifting in time units with a resolution range of 156 to 417 ps. The finest resolution equals one eighth of the VCO period. The VCO period is a function of the frequency input and the multiplication and division factors. Each clock output counter can choose a different phase of the VCO period from up to eight taps. Designers can use this clock output counter along with an initial setting on the post-scale counter to achieve a phase-shift range for the entire period of the output clock. The phase tap feedback to the m counter can shift all outputs to a single phase. The Quartus II software automatically sets the phase taps and counter settings according to the phase shift entered. Lock Detect Signal The lock output indicates that there is a stable clock output signal in phase with the reference clock. Without any additional circuitry, the lock signal may toggle as the PLL begins tracking the reference clock. Therefore, the designer may need to gate the lock signal for use as a system-control signal. |
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