EP4SE360F35I4 Datasheet, PDF(201/432 Page) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

EP4SE360F35I4 Datasheet, PDF (201/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

◁

Chapter 6: I/O Features in Stratix IV Devices

On-Chip Termination Support and I/O Termination Schemes

6â27

Table 6â6. Selectable I/O Standards for On-Chip Series Termination with and Without Calibration

(Part 2 of 2)

I/O Standard

SSTL-15 Class I

SSTL-15 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

On-Chip Series Termination Setting

Row I/O (ï)

50

â

50

25

50

â

50

â

Column I/O (ï)

50

25

50

25

50

25

50

25

Left-Shift Series Termination Control

Stratix IV devices support left-shift series termination control. You can use left-shift

series termination control to get the calibrated OCT RS with half of the impedance

value of the external reference resistors connected to the RUP and RDN pins. This feature

is useful in applications that require both 25-ï and 50-ï calibrated OCT RS at the

same VCCIO. For example, if your application requires 25-ï and 50-ï calibrated OCT

RS for SSTL-2 Class I and Class II I/O standards, you only need one OCT calibration

block with 50-ï external reference resistors.

You can enable the left-shift series termination control feature in the ALTIOBUF

megafunction in the Quartus II software. The Quartus II software only allows

left-shift series termination control for 25-ï calibrated OCT RS with 50-ï external

reference resistors connected to the RUP and RDN pins. You can only use left-shift series

termination control for the I/O standards that support 25-ï calibrated OCT RS .

1 This feature is automatically enabled if you are using a bidirectional I/O with 25-ï

calibrated OCT RS and 50-ï parallel OCT.

f For more information about how to enable the left-shift series termination feature in

the ALTIOBUF megafunction, refer to the I/O Buffer (ALTIOBUF) Megafunction User

Guide.

September 2012 Altera Corporation

Stratix IV Device Handbook

Volume 1

▷