Altera ALTDLL Uživatelský manuál Strana 54
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Hodnocené. / 5. Na základě hodnocení zákazníků
Chapter 4: Functional Description 4–18
ALTIOBUF Megafunction and Delay Chains Integration
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
ALTIOBUF Megafunction and Delay Chains Integration
You must instantiate the ALTIOBUF megafunction separately to configure the input
buffer block, output buffer block, and differential output buffer block that are used
together with the ALTDQ_DQS megafunction. These I/O buffers are used so that the
impedance between the system and the external circuitry matches. This
implementation maximizes the power transfer and minimizes reflections from the
external circuitry.
c The ALTIOBUF megafunction must not be used to configure any dynamic delay
chains. The ALTIOBUF must only be used to configure the I/O buffers to avoid
conflict between the dynamic configuration and delay chain circuitry in the
ALTDQ_DQS megafunction.
The dynamic delay chains are controlled by the configuration circuitry encapsulated
in the ALTDQ_DQS megafunction. Each instance of the I/O buffer uses the D1, D5,
and D6 delay chains. These delay chains are dynamically configured by the
IO_CONFIG and DQS_CONFIG blocks. The IO_CONFIG and DQS_CONFIG blocks are
a shift registers that change the delay settings in the I/O buffers that are connected to
the I/O pins and DQ and DQS I/O pins, respectively. The IO_CONFIG block cannot
configure the dynamic delay chains on the OCT path or the DQS input path because
these delay chains are configured by the DQS_CONFIG block.
f For more information about the IO_CONFIG and DQS_CONFIG blocks, refer to
“DQS_CONFIG / IO_CONFIG Block” on page 4–22.
f For more information about input buffer, output buffer, or bidirectional buffer, refer to
the I/O Buffer (ALTIOBUF) Megafunction User Guide.
Figure 4–10 through Figure 4–17 show the various configurations of the ALTDQ_DQS
megafunction when combined with the ALTIOBUF megafunction. These
configurations apply to both the DQ and DQS I/O pins. The use of the datain and
datout signals in these figures are generic. These signals represent either data, clock,
or strobe in external memory interfaces.
Figure 4–10. Input Only—Single-Ended
Figure 4–11. Input Only—Differential
ALTIOBUF
ALTDQ_DQS
datain
dataout
IO_IBUF
ALTIOBUF
datain
dataout
datain_n
IO_IBUF
ALTDQ_DQS
- 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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