DK-DEV-5SGXEA7N【PDF 119/527 页】KIT DEV STRATIX V FPGA 5SGXEA7

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SV51006

2014.01.10

Non-Voltage-Referenced I/O Standards

5-7

Non-Voltage-Referenced I/O Standards

Each Stratix V I/O bank has its own V CCIO pins and supports only one V CCIO of 1.2, 1.25, 1.35, 1.5, 1.8, 2.5,

or 3.0 V. An I/O bank can simultaneously support any number of input signals with different I/O standard

assignments if the I/O standards support the V CCIO level and V CCPD requirement of the I/O bank.

For output signals, a single I/O bank supports non-voltage-referenced output signals that drive at the same

voltage as V CCIO . Because an I/O bank can only have one V CCIO value, it can only drive out the value for

non-voltage-referenced signals.

For example, an I/O bank with a 2.5 V V CCIO setting can support 2.5 V standard inputs and outputs, and

3.0 V LVCMOS inputs only.

Voltage-Referenced I/O Standards

To accommodate voltage-referenced I/O standards:

? Each Stratix V I/O bank supports multiple dedicated VREF pins feeding a common V REF bus.

? Each bank can have only a single V CCIO voltage level and a single voltage reference (V REF ) level.

An I/O bank featuring single-ended or differential standards can support different voltage-referenced

standards if all voltage-referenced standards use the same V REF setting.

For performance reasons, voltage-referenced input standards use their own V CCPD level as the power source.

This feature allows you to place voltage-referenced input signals in an I/O bank with a V CCIO of 2.5 V or

below. For example, you can place HSTL-15 input pins in an I/O bank with 2.5 V V CCIO . However, the

voltage-referenced input with R T OCT enabled requires the V CCIO of the I/O bank to match the voltage of

the input standard. R T OCT cannot be supported for the HSTL-15 I/O standard when V CCIO is 2.5 V.

Voltage-referenced bidirectional and output signals must be the same as the V CCIO voltage of the I/O bank.

For example, you can place only SSTL-2 output pins in an I/O bank with a 2.5 V V CCIO .

Mixing Voltage-Referenced and Non-Voltage Referenced I/O Standards

An I/O bank can support voltage-referenced and non-voltage-referenced pins by applying each of the rule

sets individually.

Examples:

? An I/O bank can support SSTL-18 inputs and outputs, and 1.8 V inputs and outputs with a 1.8 V V CCIO

and a 0.9 V V REF .

? An I/O bank can support 1.5 V standards, 1.8 V inputs (but not outputs), and HSTL and 1.5 V HSTL

I/O standards with a 1.5 V V CCIO and 0.75 V V REF .

Guideline: Use the Same V CCPD for All I/O Banks in a Group

One V CCPD is shared in a group of I/O banks. If one I/O bank in a group uses 3.0 V V CCPD , other I/O banks

in the same group must also use 3.0 V V CCPD .

The I/O banks with the same bank number form a group. For example, I/O banks 7A, 7B, 7C, and 7D form

a group and share the same V CCPD . This sharing is applicable to all I/O banks, with the following exceptions:

? I/O banks 3A and 3B form a group with one V CCPD .

? I/O banks 3C, 3D, and 3E (if available) form another group with its own V CCPD .

I/O Features in Stratix V Devices

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