How do you choose an Oscillator that satisfies Reference Clock (REFCLK) requirements for Hi-Speed USB 2.0 transceivers?
How do you choose a reference clock for USB3317 that runs at 26 MHz?
For the requirements for REFCLK, please read "Section 5.4.1 Reference Clock Requirements" of the datasheet.
DSC1001 and DSC6000 satisfy the requirements but the latter is slightly less expensive. The DSC6000 part number that you order depends partly on design factors that aren't requirements for USB3317 (package, temperature, etc.,) You will need to use the ClockWorks Configurator to obtain the actual part number. This can be used to select an appropriate part number for an oscillator that will suit your design requirements.