ppc440gp-3rc500cz Applied Micro Circuits Corporation (AMCC), ppc440gp-3rc500cz Datasheet - Page 77
ppc440gp-3rc500cz
Manufacturer Part Number
ppc440gp-3rc500cz
Description
Power Pc 440gp Embedded Processor
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.PPC440GP-3RC500CZ.pdf
(83 pages)
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Revision 1.08 – April 3, 2008
Example 1:
If the data-to-PLB clock timing is as shown in the example below, then the read clock is not delayed and the Stage
1 data is sampled at (1). Except for small, low frequency memory systems with the memory located physically
close to the PPC440GP, it is unlikely that Stage 1 data can be sampled. When the data comes later, it is necessary
to sample Stage 2 or Stage 3 data. (see Examples 2 and 3). Another way to get the desired data-to-PLB timing to
allow Stage 1 sampling is to buffer MemClkOut0 and skew it enough to guarantee the timing. In this example
T
DDR SDRAM Read Cycle Timing—Example 1
AMCC
Data Sheet
T
= 1.5ns at worst case conditions.
Data in Stage 1 D
Data out Stage 1
Data in at RDSP
DQS Stage 1 C
Data out RDSP
with no ECC
Data at pin
DQS at pin
PLB Clock
T
DIN
High
Low
High
Low
T
High
Low
T
D0
SIN
T
D0
T
T
T
P
T
T
SIN
P
DIN
T
D0
= Propagation delay through FFs
= Propagation delay, Stage 1 input to RDSP input w/o ECC
= Delay from DQS at package pin to C on Stage 1 FF.
T
= Delay from data at package pin to D on Stage 1 FF.
D1
D0
P
D1
D0
D1
(1)
D0
D1
D2
440GP – Power PC 440GP Embedded Processor
D2
D0
D1
D2
D3
D2
D3
D2
D3
D2
D3
D2
D3
77
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