ppc460ex Applied Micro Circuits Corporation (AMCC), ppc460ex Datasheet - Page 88

• Manufacturer Part Number: ppc460ex
• Description: Powerpc 460ex Embedded Processor
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

460EX – PPC460EX Embedded Processor
Figure 9. DDR SDRAM Simulation Signal Termination Model
DDR2 SDRAM On-Die Termination Impedance Setting
For all DDR2 applications, the On-Die Termination (ODT) impedance value must be set to 75 ohms in the DIMM
Extended Mode Register (EMR) in order to optimize the data transmission during memory write operations.
Table 20. DDR SDRAM Output Driver Specifications
88
Write Data
MemData00:63
ECC0:7
DM0:8
MemClkOut
MemAddr00:13
BA0:2
RAS
CAS
WE
BankSel0:1
ClkEn0:3
DQS0:8
MemODT0:1
Note: This diagram illustrates the model of the DDR SDRAM interface used when generating simulation timing data.
It is not a recommended physical circuit design for this interface. An actual interface design will depend on many
factors, including the type of memory used and the board layout.
Signal Path
PPC460EX
Addr/Ctrl (DDR2)
Addr/Ctrl/Data/DQS/DM (DDR1)
MemClkOut
MemClkOut
I/O H (maximum)
10
10
10
10
10
10
10
10
10
10
10
10
10
10pF
10pF
Output Current (mA)
V
Preliminary Data Sheet
120Ω
TT
50Ω
30pF
= SOV
Revision 1.12 – July 17, 2008
DD
I/O L (maximum)
/2
10
10
10
10
10
10
10
10
10
10
10
10
10
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