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Chapter 3: Parameter Settings 3–17
ALTDQ_DQS Parameter Editor
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
Table 3–10 describes the options available on the DQSn I/O page. This page allows
you to configure the DQS and DQSn I/O pins for the ALTDQ_DQS instance. These
options are used for memory interfaces that need differential or complementary
strobes.
Table 3–11 describes the options available on the Reset/Config Ports page. For more
information about reset and config ports, refer to “ALTDQ_DQS Megafunction Ports”
on page 4–33.
Table 3–10. Options on DQS/DQSn I/O Page
Parameter Name Legal Value
Clear Box
Parameter Name Description
Use DQSn I/O — DQS_DQSN_MODE Enables access to the DQS I/O that is configured as
either differential or complementary. Altera recommends
that you use differential DQS for DDR3 interfaces to
improve signal integrity.
If the DQSn I/O is disabled, the value for the
DQS_DQSN_MODE parameter is none. When enabled,
the value may either Complementary pair or Differential
pair.
DQS and DQSn IO
Configuration
mode
Differential
pair or
Complement
ary pair
DQS_DQSN_MODE If you turn on the Differential pair option, the DQSn I/O
pin is configured in a differential pair along with the DQS
I/O pin. This means that the OE and OCT paths are
configured for the DQSn I/O pin, which is similar to the
DQS I/O pin. The input and output paths are shared with
the DQS I/O pin. This mode is used mainly for DDR2 and
DDR3 SDRAM, and RLDRAM II applications.
If you turn on the Complementary pair option, the DQSn
I/O pin is configured in a complementary pair along with
the DQS I/O pin. In this mode, the DQSn I/O pin is
configured similarly to the DQS I/O pin. This mode is
used mainly for QDR/QDR II applications.
Table 3–11. Options on Reset/Config Ports Page (Part 1 of 2)
Parameter Name Legal Value
Clear Box
Parameter Name Description
Reset ports
Create
'dqs_areset'
input port
— — Enables the asynchronous reset port that
asynchronously resets all registers in the DQS output or
DQS OE path.
Reset ports
Create
'dqs_sreset'
input port
— — Enables synchronous reset port that synchronously
resets all registers in the DQS output or DQS OE path.
Reset ports
Create
'input_dq_areset'
input port
— — Enables asynchronous reset port that asynchronously
resets all registers in the DQ input 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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