EP4CE40 datasheet(114/488 Pages) ALTERA

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6–8

Chapter 6: I/O Features in Cyclone IV Devices

OCT Support

Cyclone IV Device Handbook,

May 2013

Altera Corporation

Volume 1

1 For more details about the differential I/O standards supported in Cyclone IV I/O

banks, refer to “High-Speed I/O Interface” on page 6–24.

On-Chip Series Termination with Calibration

Cyclone IV devices support RS OCT with calibration in the top, bottom, and right I/O

banks. The RS OCT calibration circuit compares the total impedance of the I/O buffer

to the external 25-

Ω ±1% or 50-Ω ±1% resistors connected to the RUP and RDN pins, and

dynamically adjusts the I/O buffer impedance until they match (as shown in

Figure 6–2).

BLVDS

8,12,16

—

1,2,3,4,

5,6,7,8

3,4,5,6,

7,8

0,1,2

—

LVDS (3)

—

5,6

—

PPDS (3), (4)

—

RSDS and mini-

LVDS (3), (4)

—

Differential LVPECL

(5)

—

3,4,5,6,

7,8

—

Notes to Table 6–2:

(1) The default current strength setting in the Quartus II software is 50-

Ω OCT without calibration for all non-voltage reference and HSTL/SSTL Class I I/O standards.

The default setting is 25-

Ω OCT without calibration for HSTL/SSTL Class II I/O standards.

(2) The differential SSTL-18 and SSTL-2, differential HSTL-18, HSTL-15, and HSTL-12 I/O standards are supported only on clock input pins and PLL output clock pins.

(3) True differential (PPDS, LVDS, mini-LVDS, and RSDS I/O standards) outputs are supported in row I/O banks 1, 2, 5, and 6 only for Cyclone IV E devices and right

I/O banks 5 and 6 only for Cyclone IV GX devices. Differential outputs in column I/O banks require an external resistor network.

(4) This I/O standard is supported for outputs only.

(5) This I/O standard is supported for clock inputs only

(6) The default Quartus II slew rate setting is in bold; 2 for all I/O standards that supports slew rate option.

(7) Differential SSTL-18, differential HSTL-18, HSTL-15, and HSTL-12 I/O standards do not support Class II output.

(8) Cyclone IV GX devices only support right I/O pins.

(9) Altera not only offers current strength that meets the industrial standard specification but also other additional current strengths.

Table 6–2. Cyclone IV Device I/O Features Support (Part 2 of 2)

I/O Standard

IOH/IOL Current Strength

Setting (mA) (1), (9)

RS OCT with

Calibration

Setting, Ohm (

Ω)

RS OCT Without

Calibration

Setting, Ohm (

Ω)

Cyclone

IV E I/O

Banks

Support

Cyclone

IV GX I/O

Banks

Support

Slew

Rate

Option

(6)

PCI-

clamp

Diode

Support

Column I/O

Row I/O

Column

I/O

Row

I/O (8)

Column

I/O

Row

I/O (8)

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