參數(shù)資料
型號: PPC440EP-3pbfffCx
廠商: Applied Micro Circuits Corp.
英文描述: Power PC 440EP Embedded Processor
中文描述: 440EP的Power PC嵌入式處理器
文件頁數(shù): 78/84頁
文件大?。?/td> 541K
代理商: PPC440EP-3PBFFFCX
78
AMCC Proprietary
440EP – PPC440EP Embedded Processor
Revision 1.26 – April 25, 2007
Data Sheet
Example 2:
In this example Read Clock is delayed almost 1/2 cycle. Without ECC, Stage 2 data can be sampled at
(2)
. If ECC
is enabled, Stage 3 data must be sampled (see Example 3). In this example, T
T
and T
TE
are system dependent
and taken into account by controller initialization software.
Figure 12. DDR SDRAM Read Cycle Timing—Example 2
DQS at pin
PLB Clock
Read Clock Delayed
T
SIN
Data at pin
D0
D1
D2
D3
DQS Stage 1 C
D0
D1
D2
D3
T
DIN
D0
D2
Data in Stage 1 D
D1
D3
Data out Stage 1
High
Low
T
P
D0
D2
D1
D3
Data in at RDSP
without ECC
High
Low
T
T
= Propagation delay from Stage 2 input to RDSP input w/o ECC
T
TE
= Propagation delay from Stage 2 input to RDSP input with ECC
D0
D2
D1
D3
Data out Stage 2
High
Low
Data out at RDSP
without ECC
High
Low
(2)
T
P
D0
D2
D1
D3
Data in at RDSP
with ECC
High
Low
D0
D2
D1
D3
T
T
T
TE
D0
D2
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