参数资料
型号: IPR-SDRAM/DDR2
厂商: Altera
文件页数: 47/106页
文件大小: 0K
描述: IP DDR2 SDRAM CONTROLLER RENEW
标准包装: 1
系列: *
类型: MegaCore
功能: DDR2 SDRAM 控制器
许可证: 续用许可证
Chapter 3: Functional Description
Device-Level Description
Figure 3–6. Cyclone II DQS Group Block Diagram
3–11
doing_ w r
D
Q
d q _oe
DQ_A OE
D Q
8
w data
D
16
E N
Q
D
Q
Ao
0
d q
w data_ v alid
D
Q
D
Q
1
Bo
E N
w rite_clk
8
Q
D
Q
D
A I
resynch_clk
resynched_data
Optional Inverters (Note 4)
E N
rdata
8
Q
D
Q
D
Q
D
16
Preset (asynchronous)
C I
E N
B I
D
Q
d q _ena b le_reset
postam b le_clk
D
Q
d q _ena b le
Optional Inverter (Note 4)
(Note 3)
d q _capt u re_clk
Clock Control Block
Clock Delay
Control Circ u it
Delay
doing_ w r
d q s_oe
DQS_A OE
D Q
D
Q
d q s_ bu rst
B OE
D
Q
D
Q
0
d q s
2
D
Q
1
b e
D
Q
doing_ w r
E N
D
Ao Q
0
dm
D
Q
D
Q
1 1
Bo
E N
IOEs
FPGA LEs
w rite_clk
altddio Megafunctions
Notes to Figure 3–6 :
(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) Each DQS requires a global clock resource. Invert combout of the ALTDDIO_BIDIR megafunction for the DQS pin before feeding in to inclock
of the ALTDDIO_BIDIR megafunction for the DQ pin.
(4) The optional inverters are controlled by the resynchronization edge and postamble edge settings on the Manual Timing tab, refer to “Manual
? March 2009
Altera Corporation
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