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Chapter 9: Timing Diagrams 9–19
DDR3 High-Performance Controllers II
December 2010 Altera Corporation External Memory Interface Handbook Volume 3
Section II. DDR3 SDRAM Controller with ALTMEMPHY IP User Guide
The following sequence corresponds with the numbered items in Figure 9–10:
1. The user logic requests the first read by asserting the
local_read_req
signal, and
the size and address for this read. In this example, the request is a burst of length
of 2 to the local address
0×000001
. This local address is mapped to the following
memory address in half-rate mode:
mem_row_address = 0×0000
mem_col_address = 0×0001<<2 = 0×0004
mem_bank_address = 0×00
2. The controller issues the first read memory command and address signals to the
ALTMEMPHY megafunction for it to send to the memory device.
3. The controller asserts the
afi_doing_rd
signal to indicate to the ALTMEMPHY
megafunction the number of clock cycles of read data it must expect for the first
read. The ALTMEMPHY megafunction uses the
afi_doing_rd
signal to enable its
capture registers for the expected duration of memory burst.
4. The ALTMEMPHY megafunction issues the first read command to the memory
and captures the read data from the memory.
5. The ALTMEMPHY megafunction returns the first data read to the controller after
resynchronizing the data to the
phy_clk
domain, by asserting the
afi_rdata_valid
signal when there is valid read data on the
afi_rdata
bus.
6. The controller returns the first read data to the user by asserting the
local_rdata_valid
signal when there is valid read data on the
local_rdata
bus. If
the ECC logic is disabled, there is no delay between the
afi_rdata
and the
local_rdata
buses. If there is ECC logic in the controller, there is one or three clock
cycles of delay between the
afi_rdata
and
local_rdata
buses.
- User Guide 1
- Contents 3
- Chapter 8. Latency 5
- Chapter 9. Timing Diagrams 5
- 1. About This IP 7
- Release Information 8
- Device Family Support 8
- 1–4 Chapter 1: About This IP 10
- Features 10
- ALTMEMPHY Megafunction 11
- Note to Table 1–4: 12
- Note to Table 1–5: 12
- High-Performance Controller 13
- System Requirements 14
- Installation and Licensing 14
- Free Evaluation 15
- 1–10 Chapter 1: About This IP 16
- 2. Getting Started 17
- Specifying Parameters 18
- SOPC Builder Flow 19
- Generated Files 22
- 3. Parameter Settings 29
- Memory Settings 30
- ALTMEMPHY Parameter Settings 31
- Note to Table 3–3: 34
- Note to Table 3–5: 38
- PHY Settings 39
- Board Settings 41
- Controller Settings 42
- 4. Compiling and Simulating 47
- Compiling the Design 48
- Simulating the Design 50
- Calibration 55
- DDR3 SDRAM Without Leveling 55
- Step 6: Postamble 57
- Step 7: Prepare for User Mode 57
- DDR3 SDRAM With Leveling 59
- Step 2: Write Leveling 62
- Address and Command Datapath 63
- ° ), or the inverted 64
- Clock and Reset Management 65
- Clock Management 65
- Note to Table 5–1: 67
- Reset Management 69
- Read Datapath 70
- Write Datapath 74
- ALTMEMPHY Signals 75
- Notes to Table 5–3: 77
- Note to Table 5–3: 79
- Notes to Table 5–5: 82
- PHY-to-Controller Interfaces 83
- Notes to Figure 5–17: 86
- Notes to Figure 5–18: 87
- Notes to Figure 5–19: 88
- Notes to Figure 5–20: 89
- Preliminary Steps 90
- Design Considerations 90
- Clocks and Resets 90
- Using a Custom Controller 91
- 6. Functional Description— 95
- Command FIFO Buffer 96
- PHY Interface Logic 98
- Control Logic 99
- Figure 6–3. ECC Block Diagram 100
- Block Description 101
- Interrupts 102
- Partial Writes 102
- Partial Bursts 103
- ECC Latency 103
- ECC Registers 104
- ECC Register Bits 106
- Example Top-Level File 108
- Example Driver 109
- Top-level Signals Description 110
- or vhd file 111
- Note to Table 6–14: 114
- 7. Functional Description— 117
- Write Data FIFO Buffer 120
- Command Queue 120
- Bank Management Logic 120
- Timer Logic 121
- Command-Issuing State Machine 121
- ODT Generation Logic 122
- User-Refresh Commands 122
- Multi-Cast Write 122
- Low-Power Mode Logic 123
- Error Correction Coding (ECC) 123
- Notes to Table 7–7: 133
- Register Maps Description 134
- ALTMEMPHY Register Map 135
- Controller Register Map 137
- 8. Latency 143
- 8–2 Chapter 8: Latency 144
- Chapter 8: Latency 8–3 145
- 8–4 Chapter 8: Latency 146
- 9. Timing Diagrams 147
- Auto-Precharge 148
- [1] [2] [3] 148
- User Refresh 149
- Initialization Timing 156
- Calibration Timing 158
- AABBCCDD AABBCCDD AABBCCDD 162
- EEFF0011 EEFF0011 EEFF0011 162
- [1] [3] [4][2] 166
- Half-Rate Read With Gaps 168
- Half-Rate Write With Gaps 169
- [2][1] [5] [4] [6][3] 170
- [12][6][7][10] [11] 172
- Additional Information 175
- Typographic Conventions 176
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