Altera ALTDLL - Manual (Page 14)

Chapter 2: Getting Started 2–8
Design Example: Implementing Read Paths Using Stratix III Devices
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
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6. On the Advanced Options tab, on the DQS IN page, specify the parameters as
shown in Table 2–6 . These parameters configure the DQS input path of the
ALTDQ_DQS instance.
Table 2–5. Parameter Settings
Parameter Value
RLDRAMII Mode NONE
Number of bidirectional DQ 0
Number of input DQ 8
Number of output DQ 0
Number of stages in dqs_delay_chain 3
DQS input frequency 150 MHz
Use half-rate components Turned off.
The design uses full-rate
memory components, so
you do not select this
option.
Use Dynamic OCT Turned off.
Dynamic OCT is not used for
input paths.
Add memory interface specific fitter grouping assignments Turned on.
Table 2–6. Advance Options (DQS IN)
Parameter Sub-options Value
Enable DQS Input Path — Turned on.
Enable dqs_delay_chain — Selected.
Advanced delay chain options Select dynamically using
configuration registers Turned off.
DQS delay chain
‘delayctrlin’ port source DLL
The DQS delay-chain settings
is based on the DLL.
DQS Delay Buffer Mode Low
Use the same mode selected
in the DLL settings.
DQS Phase Shift 9000..
Specify a 90° DQS phase shift.
The phase-shift value must
inter-relate with the selected
dqs_delay_chain stage.
Enable DQS offset control Turned off.
Disable DQS delay fine-tuning
using offset feature.
Enable DQS delay chain
latches Turned off.