Article ID: 000079378 Content Type: Product Information & Documentation Last Reviewed: 09/11/2012

How do the “Number of Delay Chains” and “Available Phase Shift” specifications relate to the DLL frequency range specifications table in the device datasheet?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

For each “Frequency mode” listed in the DLL frequency range specifications table in the device datasheet, certain “Number of Delay Chains” are available in the device DLL. Dividing 360 degrees by the “Number of Delay Chains” available in each frequency mode will give the “Available Phase Shift“ for that frequency mode. 

For example in Stratix® IV devices, when “Frequency mode” is zero, the corresponding “Number of Delay Chains” is 16. Dividing 360 by 16 will give the base “Available Phase Shift” of 22.5 degrees.  For the Available Phase Shift values for the device you are targeting, refer to the respective device handbook.


Related Products

This article applies to 8 products

HardCopy™ III ASIC Devices
HardCopy™ IV GX ASIC Devices
HardCopy™ IV E ASIC Devices
Stratix® IV E FPGA
Arria® II GZ FPGA
Stratix® IV GX FPGA
Stratix® IV GT FPGA
Stratix® III FPGAs