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EP4CE40 Datasheet(PDF) 121 Page - Altera Corporation |
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EP4CE40 Datasheet(HTML) 121 Page - Altera Corporation |
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121 / 488 page  Chapter 6: I/O Features in Cyclone IV Devices 6–15 Termination Scheme for I/O Standards May 2013 Altera Corporation Cyclone IV 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 (refer to Figure 6–7 and Figure 6–8). Cyclone IV devices support differential SSTL-2 and SSTL-18, differential HSTL-18, HSTL-15, and HSTL-12, PPDS, LVDS, RSDS, mini-LVDS, and differential LVPECL. Figure 6–7. Cyclone IV Devices Differential HSTL I/O Standard Class I and Class II Interface and Termination External On-Board Termination OCT Transmitter Receiver VTT VTT Transmitter Receiver VTT VTT Cyclone IV Device Family Series OCT 50 Ω Differential HSTL Class I Termination Differential HSTL Class II Transmitter Receiver 50 Ω 50 Ω 50 Ω 50 Ω VTTVTT 50 Ω 50 Ω VTT VTT Transmitter Receiver 50 Ω 50 Ω 50 Ω 50 Ω VTT VTT 50 Ω 50 Ω VTT VTT Cyclone IV Device Family Series OCT 25 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω Figure 6–8. Cyclone IV Devices Differential SSTL I/O Standard Class I and Class II Interface and Termination (1) Note to Figure 6–8: (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 Ω 50 Ω 50 Ω 50 Ω VTT VTT 25 Ω 25 Ω Transmitter Receiver 50 Ω 50 Ω 50 Ω 50 Ω VTTVTT 25 Ω 25 Ω 50 Ω 50 Ω VTT VTT Transmitter Receiver 50 Ω 50 Ω 50 Ω 50 Ω VTT VTT 50 Ω 50 Ω VTT VTT Cyclone IV Device Family Series OCT 25 Ω Transmitter Receiver 50 Ω 50 Ω 50 Ω 50 Ω VTT VTT 50 Ω Cyclone IV Device Family Series OCT Termination |
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