参数资料
型号: IP-SDRAM/DDR2
厂商: Altera
文件页数: 87/106页
文件大小: 0K
描述: IP DDR2 SDRAM CONTROLLER
标准包装: 1
系列: *
类型: MegaCore
功能: DDR2 SDRAM 控制器
许可证: 初始许可证
A–9
Resynchronization
Table A–5 shows the manual resynchronization parameters.
Table A–5. Manual Resynchronization Parameters
Cycle
0, 1, 2, 3, 4, 5, 6
Clock
clk
write_clk
clk
write_clk
Edge
Rising
Falling
Falling
Rising (2)
Phase ( ° )
0 (1)
90
180
270
Notes to Table A–5 :
(1) Resynchronization cycle 0 phase 0 is defined as the first rising edge of clk capable of
resynchronizing the read data for CAS latency = 2.
(2) Use the intermediate resynchronization option to guarantee timing between the
resynchronization registers and registers on the system clock.
Figure A–5 on page A–9 shows an example of how to choose the best manual
resynchronization phase. In this example the best resynchronization phase is cycle =
0, phase = 270 ° , and the rising edge of write_clk .
This example is for CAS latency = 2. For CAS latency = 2.5, add 180 ° to the
resynchronization phase; for CAS latency = 3, add 1 cycle to the resynchronization
cycle.
Figure A–5. Choosing the Best Resynchronization Phase
clk
write_clk
dqs (90 shifted)
dq
o
Theoretical Q Output
of DQ Capture Register
H
L
H/L
(see Note 1)
Theoretical Round Trip Delay
Actual Data Valid at
D Input of Resynchronization
Register (see Note 1)
Safe Resynchronization Window
H/L
Resynchronization
Cycle
0
1
2
Resynchronization
Phase
0
270
0
1 8 0
Best Resynchronization Phase
Note to Figure A–5 :
(1) Figure 3–4 , Figure 3–5 , and Figure 3–6 on page 3–9 show these registers.
? March 2009
Altera Corporation
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