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EP3C80 Datasheet(PDF) 113 Page - Altera Corporation |
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EP3C80 Datasheet(HTML) 113 Page - Altera Corporation |
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113 / 274 page  Chapter 6: I/O Features in the Cyclone III Device Family 6–15 Termination Scheme for I/O Standards July 2012 Altera Corporation Cyclone III Device Handbook Volume 1 Differential I/O Standard Termination Differential I/O standards typically require a termination resistor between the two signals at the receiver. The termination resistor must match the differential load impedance of the bus (Figure 6–8 and Figure 6–9). The Cyclone III device family supports differential SSTL-2 and SSTL-18, differential HSTL-18 , HSTL-15, and HSTL-12, PPDS, LVDS, RSDS, mini-LVDS, and differential LVPECL . Figure 6–8. Cyclone III Device Family Differential HSTL I/O Standard Termination External On-Board Termination OCT Transmitter Receiver VTT VTT Transmitter Receiver VTT VTT Cyclone III Device Family Series OCT 50 Differential HSTL Termination Figure 6–9. Cyclone III Device Family Differential SSTL I/O Standard Termination (1) Note to Figure 6–9: (1) Only Differential SSTL-2 I/O standard supports Class II output. Differential SSTL Class I Differential SSTL Class II External On-Board Termination OCT Transmitter Receiver 50 50 50 50 VTT VTT 25 25 Transmitter Receiver 50 50 50 50 VTTVTT 25 25 50 50 VTT VTT Transmitter Receiver 50 50 50 50 VTT VTT 50 50 VTT VTT Cyclone III Device Family Series OCT 25 Transmitter Receiver 50 50 50 50 VTT VTT 50 Cyclone III Device Family Series OCT Termination |
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