PPC440EP-3PBFFFCX AMCC [Applied Micro Circuits Corporation], PPC440EP-3PBFFFCX Datasheet - Page 78

• Manufacturer Part Number: PPC440EP-3PBFFFCX
• Description: Power PC 440EP Embedded Processor
• Manufacturer: AMCC [Applied Micro Circuits Corporation]

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
and taken into account by controller initialization software.
Figure 12. DDR SDRAM Read Cycle Timing—Example 2
78
Revision 1.26 – April 25, 2007
Read Clock Delayed
Data out at RDSP
Data in Stage 1 D
Data out Stage 1
DQS Stage 1 C
Data in at RDSP
Data in at RDSP
Data out Stage 2
without ECC
without ECC
Data at pin
DQS at pin
Data Sheet
PLB Clock
with ECC
T
DIN
High
Low
High
Low
High
Low
High
High
Low
Low
T
T
D0
SIN
T
T
P
TE
T
D0
= Propagation delay from Stage 2 input to RDSP input w/o ECC
= Propagation delay from Stage 2 input to RDSP input with ECC
D0
T
D1
P
D1
D0
D1
T
T
T
D2
TE
D0
D2
D1
(2)
D2
D3
D0
D1
440EP – PPC440EP Embedded Processor
D3
D2
D3
D0
D1
D0
D1
D2
D3
T
and T
D2
D3
TE
are system dependent
D2
D3
D2
D3
AMCC Proprietary