Altera DDR SDRAM High-Performance Controllers and ALTMEMP User Manual download pdf (Page 128)

7–6 Chapter 7: Latency

External Memory Interface Handbook Volume 3 June 2011 Altera Corporation

Section I. DDR and DDR2 SDRAM Controllers with ALTMEMPHY IP User Guide

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 139 140

ALTMEMPHY IP User Guide 1
Contents 3
Chapter 7. Latency 5
Chapter 8. Timing Diagrams 5
1. About This IP 7
Release Information 8
Device Family Support 8
Features 9
Unsupported Features 10
MegaCore Verification 10
Resource Utilization 11
System Requirements 12
Installation and Licensing 13
1–8 Chapter 1: About This IP 14
2. Getting Started 15
SOPC Builder Flow 16
Qsys Flow 18
Completing the Qsys System 19
Specifying Parameters 20
HardCopy Guidelines 21
Generated Files 22
3. Parameter Settings 27
Memory Settings 28
ALTMEMPHY Parameter Settings 29
Note to Table 3–3: 32
Note to Table 3–5: 34
PHY Settings 36
Board Settings 38
■ Memory Settings 39
■ PHY Settings 39
■ Board Settings 39
■ Controller Settings 39
Controller Settings 40
4. Compiling and Simulating 43
Compiling the Design 44
Simulating the Design 46
Block Description 48
Calibration 49
Address and Command Datapath 49
), or the inverted 50
Clock and Reset Management 51
Notes to Table 5–4: 54
Note to Table 5–2: 57
Cyclone III Devices 59
Read Datapath 66
Note to Figure 5–6: 68
Note to Figure 5–8: 70
Devices 71
GX Devices 72
ALTMEMPHY Signals 73
Notes to Table 5–5: 74
Note to Table 5–5: 77
Notes to Table 5–7: 79
PHY-to-Controller Interfaces 80
Altera Device 81
-- a --b 82
Figure 5–15. Full-Rate Reads 83
Figure 5–16. Half-Rate Reads 83
Notes to Figure 5–17: 85
Notes to Figure 5–18: 86
Notes to Figure 5–19: 87
Notes to Figure 5–20: 88
Preliminary Steps 89
Design Considerations 89
Clocks and Resets 89
Using a Custom Controller 90
Partial Write Operations 92
6. Functional Description— 95
Avalon-ST Input Interface 96
Command Generator 96
Timing Bank Pool 96
Arbitration Rules 97
CSR Interface 98
Data Reordering 98
Pre-emptive Bank Management 98
Quasi-1T and Quasi-2T 98
User Autoprecharge Commands 98
User-Controlled Self-Refresh 99
DDR2 SDRAM 100
Partial Writes 101
Partial Bursts 102
External Interfaces 103
Memory Side-Band Signals 104
Top-Level Signals Description 105
■ Full rate controllers 107
■ Half rate controllers 107
Sequence of Operations 111
Read Command 112
Read-Modify-Write Command 112
Example Top-Level File 113
Example Driver 114
Register Maps 116
Controller Register Map 118
7. Latency 123
7–2 Chapter 7: Latency 124
Note to Table 7–2: 125
SDRAM values 126
Handbook 127
7–6 Chapter 7: Latency 128
8. Timing Diagrams 129
Half-Rate Read 130
Half-Rate Write 132
Full-Rate Read 134
Full-Rate Write 136
Additional Information 139
Typographic Conventions 140

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