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參數資料
| 型號： | PPC440GRx-SpAfffTs |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | PowerPC 440GRx Embedded Processor |
| 中文描述： | 嵌入式處理器的PowerPC 440GRx |
| 文件頁數： | 81/88頁 |
| 文件大?。?/td> | 603K |
| 代理商： | PPC440GRX-SPAFFFTS |
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440GRx – PPC440GRx Embedded Processor
Revision 1.08 – October 15, 2007
Preliminary Data Sheet
AMCC Proprietary
81
When using unbufferred DIMMS, the loading on the address bus will be considerably greater than the clock (up to
18 loads for double-sided DIMMs). In this case, it is strongly suggested that a delay of 500ps in the clock path so
that the Address/Command setup time at the DIMMs can be met. This delay is sufficient to meet the setup time,
without having to change the programmable delay (internal to the PPC440GRx) between the DQS/DQ/DM and the
clock (assuming nominal settings as specified in the PPC440GRx Users Manual). While the clock is now 500ps
later than the nominal DQS arrival time, this still falls well within the window allowed by the JEDEC spec for T
DQSS
(± 0.25 cycle, or 1.5ns at 166MHz). In the case where it is not possible to anticipate which kind of DIMMs may be
employed in a system, it is always safe to use this 500ps clock delay, since registered DIMMs (the least heavily
loaded) will have more than enough margin (almost 1/2 cycle) to accommodate the slight decrease in address hold
time.
Termination Model
Figure 10. 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 23. DDR SDRAM Output Driver Specifications (Sheet 1 of 2)
Signal Path
Output Current (mA)
I/O H (maximum)
I/O L (maximum)
Write Data
MemData00:63
ECC0:7
DM0:8
MemClkOut
MemAddr00:13
BA0:2
10
10
10
10
10
10
10
10
10
10
10
10
10pF
10pF
MemClkOut
MemClkOut
120
Ω
50
Ω
30pF
Addr/Ctrl/Data/DQS/DM (DDR1)
V
TT
= SOV
DD
/2
PPC440GRx
Addr/Ctrl (DDR2)
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.
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相關代理商/技術參數 |
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| PPC440GRX-STA400E | 制造商:AppliedMicro 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays |
| PPC440GRX-STA533E | 制造商:AppliedMicro 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays |
| PPC440GRX-STA533EZ | 制造商:AppliedMicro 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Tape and Reel |
| PPC440GRX-STA667E | 制造商:AppliedMicro 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays |
| PPC440GRX-SUA400E | 制造商:AppliedMicro 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays |
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