ppc405ex Applied Micro Circuits Corporation (AMCC), ppc405ex Datasheet - Page 66
ppc405ex
Manufacturer Part Number
ppc405ex
Description
Powerpc 405ex Embedded Processor
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.PPC405EX.pdf
(74 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ppc405ex-NSA400T
Manufacturer:
AMCC
Quantity:
475
Company:
Part Number:
ppc405ex-NSC400T
Manufacturer:
AMCC
Quantity:
6 728
Company:
Part Number:
ppc405ex-NSD600T
Manufacturer:
AMCC/10
Quantity:
4 166
Company:
Part Number:
ppc405ex-SPC533T
Manufacturer:
AMCC
Quantity:
299
Company:
Part Number:
ppc405exR-CPC400T
Manufacturer:
IR
Quantity:
4 400
Part Number:
ppc405exR-NSD333T
Manufacturer:
MACOM
Quantity:
20 000
PPC405EX – PowerPC 405EX Embedded Processor
Figure 10. DDR SDRAM Read Data Path for a Single Data Bit
DDR SDRAM Read Cycle Timing
The following diagram illustrates the relationship of the signals involved with a DDR read operation.
Figure 11. DDR SDRAM Memory Data and DQS
66
x8 bits ECC)
ECC bits)
MemData
(x32 bits +
(x4 + x1
DQS
MemFBR
Ext FeedBack
Signals
MemFBD
Package
pins
Programmed
Rec
Read DQS
ECC detection and correction if enabled occurs after Stage 3 before completing the read on the PLB.
Delay
Driver
0
Mux
Mux
Feedback
Data Capture
Window
1
Coarse Delay
MemData
Fine Delay
2
3
DQS
Stage 1
FF
FF
DQS Falling
Edge Sync
DQS Rising
Edge Sync
DQS aligned
feedback signal
0
2
1
3
T
T
SD
HD
Mux
On-time sample clock
Mux
DDR 1X Clock
D
D
DDR 1X Clock
DDR 1X Clock
FeedBack
Signal Gen
Stage 2
Stage 2 Store
Cycles
Delay
FF
FF
FF
FF
T1 T2 T3 T4
C
C
Q2_Ovs
Q2
Q2
+1
CAS Lat Delay
(x64+ECC)
(x64+ECC)
Compare
Adjust
Oversampling
(Guard Band)
Fine Delay
Read FIFO
Upper
Lower
Read Start
Preliminary Data Sheet
Oversampling
Clock
Read Latency adjust circuit
Revision 1.21 - July 9, 2008
PLB 1X Clock
Stage 3
FF
FF
Q3
Q3
FF: Flip-Flop
AMCC Proprietary
PLB bus
[0:63]
PLB bus
[64:127]