Altera ALTDLL - Manual (Page 21)

Chapter 3: Parameter Settings 3–3
ALTDLL Parameter Editor
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
The DLL Offset Controls/Optional Ports page allows you to instantiate the DLL
offset control blocks (A and B), specify whether to use static offset, and create the
dll_aload and dll_dqsupdate optional ports. Table 3–2 shows the options
available on DLL Offset Controls/Optional Ports page.
.
Table 3–2. Options on DLL Offset Controls/Optional Ports Page (Part 1 of 2)
Parameter Name Legal Value
Clear Box
Parameter Name Description
DLL Phase Offset
Control A
Instantiate
dll_offset_ctrl
block
Set statically
to
or
Set
dynamically
using offset
input port
USE_DLL_OFFSET_
CTRL_A
Instantiates DLL_OFFSET_CTRL_A block. The block
can be placed either at the top, bottom, or side of the
FPGA device, depending on how the Quartus II Fitter
places it. If you turn on this parameter, you must
specify whether you want to set the blocks statically or
dynamically.
–63 to 63 DLL_OFFSET_CTRL_A_
STATIC_OFFSET
The Set statically to option is a signed integer. Turn on
this option if you want a fixed offset value, and key in
the value you want.
This fixed value is added to the DLL feedback counter
and the output is generated on the
dll_offset_ctrl_a_offsetctrlout
[5..0] output port.
The default value is 0.
— DLL_OFFSET_CTRL_A_
USE_OFFSET
The Set dynamically using offset input port option
determines the output of the
dll_offset_ctrl_a_offsetctrlout
[5..0] output port. Turn on this option if you want a
dynamic offset value.
If you turn on this option, depending on whether the
dll_offset_ctrl_a_addnsub signal is
asserted or not, the phase offset specified on the offset
input bus is added or subtracted from the DLL feedback
counter output to get the
dll_offset_ctrl_a_offsetctrlout
[5..0] output.