Altera DDR Timing Wizard Manuale Utente Scaricare il pdf (Pagina 77)

Altera Corporation 3–17

November 2007 DDR Timing Wizard User Guide

Using the dtw_timing_analysis.tcl Script

Figure 3–8. Initial Resynchronization, Postamble Clock Cycle, and Phase Shift Selections

The legacy controller MegaWizard has the intermediate registers for

resynchronization turned on and the intermediate registers for postamble

turned off by default.

The intermediate resynchronization registers do not affect the

resynchronization clock cycle and phase shift selections in the legacy

controller MegaWizard as they are inserted between the second

resynchronization registers and user logic. These registers are needed if

the outputs of the second resynchronization registers cannot meet setup

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 91 92

DDR Timing Wizard 1
Table of Contents 3
November 2007 4
About this User Guide 5
Typographic 6
Conventions 6
1. About the DDR Timing 7
Device Family 8
1–4 Altera Corporation 10
Introduction 10
Altera Corporation 1–5 11
About the DDR Timing Wizard 11
Note to Figure 1–1: 11
Features 12
2. Getting Started 13
Design Flow 14
2–2 Altera Corporation 14
Altera Corporation 2–3 15
Getting Started 15
2–4 Altera Corporation 16
Launching the 17
DDR Timing 17
Entering and 18
Editing Inputs to 18
Recommended Data Path 19
2–8 Altera Corporation 20
Altera Corporation 2–9 21
2–10 Altera Corporation 22
Altera Corporation 2–11 23
2–12 Altera Corporation 24
Altera Corporation 2–13 25
Synchronous Systems 26
Altera Corporation 2–15 27
(Figure 2–10) 28
Altera Corporation 2–17 29
2–18 Altera Corporation 30
Analysis & Synthesis 31
2–20 Altera Corporation 32
Altera Corporation 2–21 33
2–22 Altera Corporation 34
Click Next 35
2–24 Altera Corporation 36
Altera Corporation 2–25 37
2–26 Altera Corporation 38
Altera Corporation 2–27 39
2–28 Altera Corporation 40
Altera Corporation 2–29 41
Altera Corporation 2–31 43
200 MHz) 44
Altera Corporation 2–33 45
2–34 Altera Corporation 46
Altera Corporation 2–35 47
2–36 Altera Corporation 48
Altera Corporation 2–37 49
2–38 Altera Corporation 50
Altera Corporation 2–39 51
2–40 Altera Corporation 52
Altera Corporation 2–41 53
2–42 Altera Corporation 54
Altera Corporation 2–43 55
Click Finish 56
Altera Corporation 2–45 57
DTW Limitations 58
2–48 Altera Corporation 60
3. Using the 61
3–2 Altera Corporation 62
-dwz_file <value> 63
-? or -help 63
-after_iptb <value> 64
-auto_adjust_cycles 64
-extract_tcos <value> 64
*auk_ddr_datapath 65
*auk_qdrii_sram_datapath 65
*auk_rldramii_datapath 65
-stop_after <value> 66
-vwf_file_name <value> 66
-write_side 66
Altera Corporation 3–7 67
■ Timing Summary 67
Altera Corporation 3–9 69
■ Recommended Settings 69
Timing Closure 72
Altera Corporation 3–13 73
Note to Figure 3–6: 73
DDR2/DDR SDRAM Interfaces 74
QDRII+/QDRII SRAM Interfaces 74
RLDRAM II Interfaces 75
3–16 Altera Corporation 76
Timing Closure Process 76
Altera Corporation 3–17 77
Analyzer 78
Altera Corporation 3–19 79
3–20 Altera Corporation 80
Altera Corporation 3–21 81
3–22 Altera Corporation 82
Changing Clock Phase Shift 83
3–24 Altera Corporation 84
Altera Corporation 3–25 85
Changing Clock Cycles 87
3–28 Altera Corporation 88
Altera Corporation 3–29 89
3–30 Altera Corporation 90
° phase shift in 90
Altera Corporation 3–31 91
Conclusion 92

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Altera DDR Timing Wizard Manuale Utente Pagina 77

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