參數(shù)資料
型號: PPC405EX-NpAfffTx
廠商: Applied Micro Circuits Corp.
英文描述: PowerPC 405EX Embedded Processor
中文描述: 嵌入式處理器的PowerPC 405EX
文件頁數(shù): 60/67頁
文件大?。?/td> 457K
代理商: PPC405EX-NPAFFFTX
PPC405EX – PowerPC 405EX Embedded Processor
60
AMCC Proprietary
Revision 1.09 - August 21, 2007
Preliminary Data Sheet
The following diagram illustrates the relationship among the signals involved with a DDR write operation.
Figure 7. DDR SDRAM Write Cycle Timing
Note:
The timing data in the following tables is based on simulation runs using Einstimer.
Table 21. I/O Timing—DDR SDRAM T
DS
Notes:
1. All of the DQS signals are referenced to MemClkOut with the DQS delay line programmed to 1 cycle.
2. Clock speed is 200MHz.
Signal Name
T
DS
(ns)
Minimum
4
4
4
4
4
Maximum
6
6
6
6
6
DQS0
DQS1
DQS2
DQS3
DQS4
DQS
MemData
PLB Clk
MemClkOut
Addr/Cmd
T
SK
T
SA
T
HA
T
DS
T
DS
T
SD
T
HD
T
SD
T
HD
T
SA
= Setup time for address and command signals to MemClkOut
T
HA
= Hold time for address and command signals from MemClkOut
T
SD
= Setup time for data signals (minimum time data is valid
before
rising/falling edge of DSQ)
T
HD
= Hold time for data signals (minimum time data is valid
after
rising/falling edge of DSQ)
T
SK
= Delay from rising edge of MemClkOut to rising/falling edge of signal (skew)
T
DS
= Delay from rising/falling edge of clock to the rising/falling edge of DQS
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