EP3C40 datasheet(105/274 Pages) ALTERA

105 / 274 page

Chapter 6: I/O Features in the Cyclone III Device Family

6–7

OCT Support

July 2012

Altera Corporation

Cyclone III Device Handbook

Volume 1

f For more information about the Cyclone III device family high-speed differential

interface support, refer to the High-Speed Differential Interfaces in the Cyclone III Device

Family chapter.

OCT Support

The Cyclone III device family features OCT to provide output impedance matching

and termination capabilities. OCT helps to prevent reflections and maintain signal

integrity while minimizing the need for external resistors in high pin-count ball grid

array (BGA) packages.

The Cyclone III device family provides output driver on-chip impedance matching

and on-chip series termination for single-ended outputs and bidirectional pins. For

bidirectional pins, OCT is active only for output.

1 When using on-chip series termination, programmable current strength is not

available.

There are two ways to implement OCT in the Cyclone III device family:

■

OCT with calibration

■

OCT without calibration

Table 6–3 lists the I/O standards that support output impedance matching and series

termination.

Table 6–3. Selectable I/O Drivers for On-Chip Series Termination with and Without Calibration Setting

I/O Standard

On-Chip Series Termination with Calibration

Setting, in ohms (

)

On-Chip Series Termination Without Calibration

Setting, in ohms (

)

Row I/O

Column I/O

Row I/O

Column I/O

3.0-V LVTTL/LVCMOS

50, 25

2.5-V LVTTL/LVCMOS

50, 25

1.8-V LVTTL/LVCMOS

50, 25

1.5-V LVCMOS

50, 25

1.2-V LVCMOS

50, 25

SSTL-2 Class I

SSTL-2 Class II

SSTL-18 Class I

SSTL-18 Class II

HSTL-18 Class I

HSTL-18 Class II

HSTL-15 Class I

HSTL-15 Class II

HSTL-12 Class I

HSTL-12 Class II

—25

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