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AR# 13809

Virtex-II, Virtex-II Pro, Virtex-4 I/O Standard - What are the specifications for the ULVDS I/O Standard?

Description

What is the ULVDS I/O Standard? What are the specifications for this I/O Standard?

Virtex-II:

For ULVDS I/O Standard, please see the Virtex-II Complete Data Sheet (all four modules):

http://www.xilinx.com/support/documentation/data_sheets/ds031.pdf
Module 2, Functional Description -> Detailed Description

The Supported Differential Signal I/O Standards table is on the first page of the Detailed Description section.

Virtex-II Pro:

For ULVDS I/O Standard, please see the Virtex-II Pro/Virtex-II Pro X Complete Data Sheet (All four modules):

http://www.xilinx.com/support/documentation/data_sheets/ds083.pdf
Module 2, Functional Description: FPGA -> Input/Output Blocks (IOBs) -> Supported I/O Standards

Go to the Supported Differential Signal I/O Standards table.

Virtex-4:

For ULVDS I/O Standard, please see the Virtex-4 FPGA User Guide:

http://www.xilinx.com/support/documentation/user_guides/ug070.pdf
Select I/O Resources" -> I/O Standards Compatibility

Scroll down to the I/O Compatibility Table.

It is also listed in FPGA Editor in the IOB block when one of the differential signaling I/O standards is chosen.

However, the DC specifications for the I/O are not available in the data sheet.

Solution

The ULVDS I/O Standard is identical to the LDT_25 I/O Standard. Consequently, both I/O standards have the same specifications.

To maintain consistency with the data sheet, use the LDT_25 specifications. The LDT_25 specifications are available as follows:

Virtex-II:

See the Virtex-II Complete Data Sheet: http://www.xilinx.com/support/documentation/data_sheets/ds031.pdf
"Module 3: DC and Switching Characteristics" -> Electrical Characteristics -> LVDS DC Specifications (LVDS_33 & LVDS_25)

Scroll to the LVDS DC Specifications Table.

Virtex-II Pro:

See the Virtex-II Pro/Virtex-II Pro X Complete Data Sheet (All four modules): http://www.xilinx.com/support/documentation/data_sheets/ds083.pdf
Module 3: DC and Switching Characteristics (Module 3) -> Electrical Characteristics -> LDT DC Specifications (LDT_25)

Scroll to the LDT DC Specifications Table.

Virtex-4:

See Virtex-4 FPGA User Guide: http://www.xilinx.com/support/documentation/data_sheets/ds302.pdf
DC and Switching Characteristics -> DC Characteristics -> LDT DC Specifications (LDT_25)

Scroll down to the LDT DC Specifications Table.

AR# 13809
Date Created 08/29/2007
Last Updated 12/15/2012
Status Active
Type General Article