參數(shù)資料
型號(hào): PPC440GR-3pbfffCx
廠商: Applied Micro Circuits Corp.
英文描述: Power PC 440GR Embedded Processor
中文描述: 440GR的Power PC嵌入式處理器
文件頁(yè)數(shù): 78/82頁(yè)
文件大?。?/td> 527K
代理商: PPC440GR-3PBFFFCX
78
AMCC Proprietary
Revision 1.16 – July 19, 2006
Preliminary Data Sheet
440GR – PPC440GR Embedded Processor
Example 3:
In this example, ECC is enabled. This requires that Stage 3 data be sampled at
(3)
. If ECC is disabled, the system
will still work, but there will be more latency before the data is sampled into RDSP. In this example, T
T
and T
TE
are
controlled and set by the software.
Figure 13. DDR SDRAM Read Cycle Timing—Example 3
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 out Stage 3
with 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 RDSP
with ECC
High
Low
(3)
T
P
D0
D2
D1
D3
Data in at RDSP
with ECC
High
Low
D0
D2
D1
D3
T
TE
D0
D2
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