What is the ULVDS I/O Standard? What are the specifications for this I/O Standard?
For ULVDS I/O Standard, please see the Virtex-II Complete Data Sheet (all four modules):
Module 2, Functional Description -> Detailed Description
The Supported Differential Signal I/O Standards table is on the first page of the Detailed Description section.
For ULVDS I/O Standard, please see the Virtex-II Pro/Virtex-II Pro X Complete Data Sheet (All four modules):
Module 2, Functional Description: FPGA -> Input/Output Blocks (IOBs) -> Supported I/O Standards
Go to the Supported Differential Signal I/O Standards table.
For ULVDS I/O Standard, please see the Virtex-4 FPGA User Guide:
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.
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:
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.
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.
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.