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3–10 Chapter 3: Parameter Settings
ALTDQ_DQS Parameter Editor
ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation
Table 3–5 describes options available on the DQS OUT/OE page. This page allows
you to configure the DQS output and output enable (OE) paths. For more information
about the DQS output and OE paths, refer to “DQS Output/OE Path” on page 4–12.
Advanced Delay
Chain Options
Enable DQS
delay chain
latches
— DQS_CTRL_LATCHES_
ENABLE
Enables the delayctrlin[5..0] and
offsetctrlin[5..0] inputs to be registered by
the dqsupdateen signal. The DLL continues changing
its delay settings value due to the feedback system.
These DLL values are propagated through the
delayctrlout and offsetctrlout signals of
the DLL and DLL offset control blocks to
DQS_DELAY_CHAIN block to calibrate the necessary
delay settings. These values are updated based on the
dll_dqsupdate port from the DLL, which is
connected to the dqsupdateen port. To use this
option, you must turn on the Create a ‘use
dll_dqsupdate’ port option on the DLL Offset
Controls/Optional Ports page in the ALTDLL parameter
editor.
Advanced Enable
Control Options
DQS Enable
Control Phase
Setting
Set statically
to
or
Set
dynamically
using
configuration
registers
DQS_ENABLE_CTRL_
PHASE_SETTING
If you turn on the Set statically to option, you can select
the phase setting for the delay chains from 0 up to 4 to
fine-tune the DQS enable signal.
If you turn on the Select dynamically using
configuration registers option, the phase setting is
determined by the phasectrlin input for the delay
chains.
Advanced Enable
Control Options
DQS Enable
Control Invert
Phase
Always,
Never, or
Based on
configuration
registers
DQS_ENABLE_CTRL_
INVERT_PHASE
If you turn on Always, the phase output is inverted.
If you turn on Never, the phase output is not inverted.
If you turn on Based on configuration registers, the
phaseinvertctrl input determines whether or not
the inverter is used. The inverter can be used to increase
the number of available phases. This is an optional field
and defaults to Never.
Enable DQS
enable block
delay chain
— USE_DQSENABLE_
DELAY_CHAIN
Enables DQS_ENABLE_DELAY_CHAIN
. This delay
ch
ain fine-tunes the outputs of DQS_ENABLE_CTRL
block so that the DQS enable signal timing matches the
DQS strobe. This delay chain is a run-time adjustable
delay chain.
Table 3–4. Options on DQS IN Page (Part 3 of 3)
Parameter Name Legal Value
Clear Box
Parameter Name Description
Table 3–5. Options on DQS OUT/OE Page (Part 1 of 2)
Parameter Name Legal Value
Clear Box
Parameter Name Description
Enable DQS
output path
— USE_DQS_OUTPUT_
PATH
Instantiates the DQS output path.
Enable DQS
output path
— USE_DQS_OUTPUT_
PATH
Instantiates the DQS output path.
- ALTDLL and ALTDQ_DQS 1
- Megafunctions User Guide 1
- UG-01032-5.0 2
- Contents 3
- 1. About these Megafunctions 5
- Features 6
- 2. Getting Started 7
- ALTOCT Megafunction 8
- Customized Controller Logic 8
- Simulate the Design 9
- Create Timing Constraints 9
- Adjust Constraints 10
- Generate the Megafunctions 11
- Settings Value 13
- Turned off 14
- Enable DQS delay chain 14
- 3. Parameter Settings 19
- [5..0] output port 20
- ALTDLL Parameter Editor 21
- ALTDQ_DQS Parameter Editor 23
- Reset/Config Ports 26
- ports on the megafunction 27
- — DQS_OFFSETCTRL_ 27
- inputs to be registered by 28
- signals of 28
- “DQ Input Path” on page 4–8 29
- 4. Functional Description 37
- ■ DQS Input Path 38
- ■ DQ Input Path 38
- ■ DQ Output/OE Path 38
- ■ DQS Output/OE Path 38
- ■ DQ/DQS OCT Path 38
- ALTDLL Megafunction 39
- ALTDQ_DQS Megafunction 40
- DQS Input Path 42
- DQ Input Path 44
- DQ Output/OE Path 46
- DQS Output/OE Path 48
- DQ/DQS OCT Path 50
- Delay Chains 51
- Deskew Delay Chains 52
- Note to Figure 4–13: 55
- Note to Figure 4–14: 55
- Note to Figure 4–15: 56
- Note to Figure 4–16: 56
- Note to Figure 4–17: 57
- DQS_CONFIG / IO_CONFIG Block 58
- ALTDLL Megafunction Ports 67
- ALTDQ_DQS Megafunction Ports 69
- DQ OE Path Megafunction Ports 78
- DQSn I/O Path Ports 79
- DQS_CONFIG/IO_CONFIG path 81
- RLDRAM interfaces 84
- Procedure 85
- 00 FF 00 FF 99
- ■ bidir_dq_io[0] 100
- A. Clear Box Generator 102
- Clear Box Generator Options 103
- Clear Box Parameters 104
- inputs are 108
- OUTPUT_DQ 114
- Additional Information 116
- Typographic Conventions 117
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