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EP1C20F400C7ES Datasheet(PDF) 39 Page - Altera Corporation |
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EP1C20F400C7ES Datasheet(HTML) 39 Page - Altera Corporation |
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39 / 106 page  Altera Corporation 2–33 May 2008 Preliminary Global Clock Network and Phase-Locked Loops Table 2–6 shows the PLL features in Cyclone devices. Figure 2–25 shows a Cyclone PLL. Figure 2–25. Cyclone PLL Note (1) Notes to Figure 2–25: (1) The EP1C3 device in the 100-pin TQFP package does not support external outputs or LVDS inputs. The EP1C6 device in the 144-pin TQFP package does not support external output from PLL2. (2) LVDS input is supported via the secondary function of the dedicated clock pins. For PLL 1, the CLK0 pin’s secondary function is LVDSCLK1p and the CLK1 pin’s secondary function is LVDSCLK1n. For PLL 2, the CLK2 pin’s secondary function is LVDSCLK2p and the CLK3 pin’s secondary function is LVDSCLK2n. (3) PFD: phase frequency detector. Table 2–6. Cyclone PLL Features Feature PLL Support Clock multiplication and division m/(n × post-scale counter) (1) Phase shift Down to 125-ps increments (2), (3) Programmable duty cycle Yes Number of internal clock outputs 2 Number of external clock outputs One differential or one single-ended (4) Notes to Table 2–6: (1) The m counter ranges from 2 to 32. The n counter and the post-scale counters range from 1 to 32. (2) The smallest phase shift is determined by the voltage-controlled oscillator (VCO) period divided by 8. (3) For degree increments, Cyclone devices can shift all output frequencies in increments of 45°. Smaller degree increments are possible depending on the frequency and divide parameters. (4) The EP1C3 device in the 100-pin TQFP package does not support external clock output. The EP1C6 device in the 144-pin TQFP package does not support external clock output from PLL2. Charge Pump VCO PFD (3) Loop Filter CLK0 or LVDSCLK1p (2) CLK1 or LVDSCLK1n (2) ÷n ÷m Δt Δt Global clock Global clock I/O buffer ÷g0 ÷g1 ÷e VCO Phase Selection Selectable at Each PLL Output Port Post-Scale Counters |
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