Altera DDR SDRAM Controller Manual de usuario Pagina 45
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Chapter 3: Functional Description 3–9
Device-Level Description
© March 2009 Altera Corporation DDR and DDR2 SDRAM Controller Compiler User Guide
Figure 3–4. Stratix II DQS Group Block Diagram (Note 1) (2)
Notes to Figure 3–4:
(1) This figure shows the logic for one DQ output only. A complete byte group consists of eight times the DQ logic with the DQS and DM logic.
(2) All clocks are clk, unless marked otherwise.
(3) Invert combout of the I/O element (IOE) for the dqs pin before feeding in to inclock of the IOE for the DQ pin. This inversion is automatic if
you use an ALTDQ megafunction for the DQ pins.
(4) The optional inverters are controlled by the resynchronization edge and postamble edge settings on the Manual Timings tab, refer to “Manual
Timing Settings” on page A–1
DQ D
write_clk
DQS
DM
dqs_oe
1
DQS Delay
Ao
Bo
Q
0
1
DQ
DQ
0
1
DQS IOEs
DM altddio Megafunction
DQ
DQ
Q
Q
D
D
be
doing_wr
dqs_burst
Q
D
2
Q
D
Q
D
QD QD
QDQD
QD
D
Q
Q Q
DQ
D
D
Q
DQ
wdata
DQ
write_clk
doing_wr
rdata
doing_rd
(pipelined)
postamble_clk
resynched_data
dq_capture_clk
resynch_clk
dq_oe
16
0
1
16
8
8
8
D
EN
EN
doing_wr
EN
EN
wdata_valid
DQ IOEs
dq_enable_reset
Preset (asynchronous)
(Note 3)
Optional Inverter (Note 4)
Optional Inverters (Note 4)
- 101 Innovation Drive 1
- San Jose, CA 95134 1
- Software Version: 9.0 1
- Document Date: March 2009 1
- UG-DDRSDRAM-10.0 2
- Contents 3
- 1. About This Compiler 5
- Features 6
- General Description 6
- Note to Figure 1–1: 7
- Note to Table 1–3: 8
- Installation and Licensing 9
- OpenCore Plus Evaluation 10
- 2. Getting Started 11
- SOPC Builder Design Flow 12
- Parameterize 14
- Constraints 15
- Add/Update Component 15
- Create Your Top-Level Design 16
- Edit the PLL 17
- Program a Device 18
- Figure 2–1. System Naming 24
- Set Up Simulation 25
- Generate 25
- Simulate the Example Design 27
- Notes to Table 2–2: 29
- Notes to Table 2–3: 30
- Notes to Table 2–4: 31
- Compile the Example Design 32
- Implement Your Design 34
- Set Up Licensing 35
- Control Logic 37
- Datapath 38
- Device-Level Description 41
- Figure 3–3. Datapath Timing 42
- Designing Your Own Controller 43
- DQS Group Block Diagrams 44
- Notes to Figure 3–4: 45
- Notes to Figure 3–5: 46
- Notes to Figure 3–6: 47
- Notes to Figure 3–7: 48
- PLL Configurations 49
- Stratix II Device 50
- Stratix Device 51
- Cyclone II Device 51
- Cyclone Device 51
- DLL Configurations 52
- Example Design 52
- Notes to Table 3–5: 53
- Interface Description 55
- Figure 3–13. Writes 56
- Interfaces & Signals 57
- DDR SDRAM 58
- Interface 58
- Local Interface 58
- [1] [3][2] [5][4] 58
- [1] [2] [3] [4] [6][5] 59
- User Refresh Control 60
- 200 clock cycles 63
- Note to Table 3–7: 65
- Parameters 67
- Controller 69
- Note to Table 3–15: 71
- Controller Timings 73
- Memory Timings 74
- Board Timings 75
- Project Settings 76
- Manual Timings 77
- Simulation Testing 77
- Hardware Testing 77
- (MT46V8M16-75Z) 78
- A. Manual Timing Settings 79
- Resynchronization 82
- Resynchronization Registers 83
- Notes to Figure A–2: 84
- Notes to Figure A–3: 85
- Notes to Figure A–4: 86
- Notes to Table A–5: 87
- Note to Figure A–5: 87
- DQS Postamble 88
- Postamble Logic 89
- System Clock 90
- Postamble 90
- Examples 91
- Board, Cyclone II Edition 95
- D. Maximizing Performance 101
- Adjust the PLL Phases 102
- Assign Pins 102
- Place the Fedback PLL 102
- Update the PLL Phases 103
- Additional Information 105
- Typographic Conventions 106
- Preliminary 106
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